ICD-10 changes for FY2027
Effective 2026-10-01. 238 codes added, 21 deleted, and 15 that keep their number but stop being billable, which is the group that denies without looking wrong.
On 2026-10-01 the code set goes from 98,186 entries to 98,403. Most of that is straightforward: new codes you will not use until you need them, and deletions you will notice immediately because the claim bounces.
The 15 codes in the first section are the problem. They are not deleted. They keep their number and their description. They stop being billable, so a claim carrying one looks entirely correct and denies anyway.
Paste the codes you actually bill into the code checker and it says which of these you use.
Stops being billable
Still valid codes. No longer submittable on their own, because they become category headers grouping more specific codes. Check the children of each with the code checker.
| Code | Description | Change |
|---|---|---|
| D69.1 | Qualitative platelet defects | Billable, becomes a header |
| I42.0 | Dilated cardiomyopathy | Billable, becomes a header |
| I42.8 | Other cardiomyopathies | Billable, becomes a header |
| I49.8 | Other specified cardiac arrhythmias | Billable, becomes a header |
| M72.2 | Plantar fascial fibromatosis | Billable, becomes a header |
| M86.8X1 | Other osteomyelitis, shoulder | Billable, becomes a header |
| M86.8X2 | Other osteomyelitis, upper arm | Billable, becomes a header |
| M86.8X3 | Other osteomyelitis, forearm | Billable, becomes a header |
| M86.8X4 | Other osteomyelitis, hand | Billable, becomes a header |
| M86.8X5 | Other osteomyelitis, thigh | Billable, becomes a header |
| M86.8X6 | Other osteomyelitis, lower leg | Billable, becomes a header |
| M86.8X7 | Other osteomyelitis, ankle and foot | Billable, becomes a header |
| M86.8X8 | Other osteomyelitis, other site | Billable, becomes a header |
| Z68.1 | Body mass index [BMI] 19.9 or less, adult | Billable, becomes a header |
| Z87.890 | Personal history of sex reassignment | Billable, becomes a header |
Deleted
In FY2026 and not in FY2027. 21 codes. The 15 billable ones are valid for dates of service up to 30 September 2026 and invalid from 2026-10-01. The other 6 are category headers, which were never submittable on their own, so there is no date of service they can be billed for.
Chapter 19: Injury, poisoning and certain other consequences of external causes
| Code | Description | Billable |
|---|---|---|
| S23.420 | Sprain of sternoclavicular (joint) (ligament) | Header |
| S23.420A | Sprain of sternoclavicular (joint) (ligament), initial encounter | Yes, until 1 Oct |
| S23.420D | Sprain of sternoclavicular (joint) (ligament), subsequent encounter | Yes, until 1 Oct |
| S23.420S | Sprain of sternoclavicular (joint) (ligament), sequela | Yes, until 1 Oct |
| T52.8X | Toxic effects of other organic solvents | Header |
| T52.8X1 | Toxic effect of other organic solvents, accidental (unintentional) | Header |
| T52.8X1A | Toxic effect of other organic solvents, accidental (unintentional), initial encounter | Yes, until 1 Oct |
| T52.8X1D | Toxic effect of other organic solvents, accidental (unintentional), subsequent encounter | Yes, until 1 Oct |
| T52.8X1S | Toxic effect of other organic solvents, accidental (unintentional), sequela | Yes, until 1 Oct |
| T52.8X2 | Toxic effect of other organic solvents, intentional self-harm | Header |
| T52.8X2A | Toxic effect of other organic solvents, intentional self-harm, initial encounter | Yes, until 1 Oct |
| T52.8X2D | Toxic effect of other organic solvents, intentional self-harm, subsequent encounter | Yes, until 1 Oct |
| T52.8X2S | Toxic effect of other organic solvents, intentional self-harm, sequela | Yes, until 1 Oct |
| T52.8X3 | Toxic effect of other organic solvents, assault | Header |
| T52.8X3A | Toxic effect of other organic solvents, assault, initial encounter | Yes, until 1 Oct |
| T52.8X3D | Toxic effect of other organic solvents, assault, subsequent encounter | Yes, until 1 Oct |
| T52.8X3S | Toxic effect of other organic solvents, assault, sequela | Yes, until 1 Oct |
| T52.8X4 | Toxic effect of other organic solvents, undetermined | Header |
| T52.8X4A | Toxic effect of other organic solvents, undetermined, initial encounter | Yes, until 1 Oct |
| T52.8X4D | Toxic effect of other organic solvents, undetermined, subsequent encounter | Yes, until 1 Oct |
| T52.8X4S | Toxic effect of other organic solvents, undetermined, sequela | Yes, until 1 Oct |
Reworded
Same code, same billable status, different description. Claims are unaffected. Update any superbill or template that keeps its own copy of the wording.
| Code | Was | Now |
|---|---|---|
| L02.232 | Carbuncle of back [any part, except buttock] | Carbuncle of back [any part, except buttock and flank] |
| L03.312 | Cellulitis of back [any part except buttock] | Cellulitis of back [any part except buttock and flank] |
| L03.322 | Acute lymphangitis of back [any part except buttock] | Acute lymphangitis of back [any part except buttock and flank] |
| Z29.14 | Encounter for prophylactic rabies immune globin | Encounter for prophylactic rabies immune globulin |
Added
Not valid for dates of service before 2026-10-01. 238 codes, grouped by chapter. 48 of them arrive as category headers rather than as billable codes, so they group the new codes beneath them and never go on a claim themselves. The Billable column says which is which.
Chapter 2: Neoplasms 3
| Code | Description | Billable |
|---|---|---|
| C78.31 | Secondary malignant neoplasm of larynx | Yes |
| C78.32 | Secondary malignant neoplasm of pharynx | Yes |
| C79.83 | Secondary malignant neoplasm of oral cavity | Yes |
Chapter 3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism 2
| Code | Description | Billable |
|---|---|---|
| D69.11 | Glanzmann thrombasthenia | Yes |
| D69.19 | Other qualitative platelet defects | Yes |
Chapter 4: Endocrine, nutritional and metabolic diseases 3
| Code | Description | Billable |
|---|---|---|
| E89.83 | Postprocedural hypoglycemia following a procedure | Header |
| E89.830 | Post bariatric hypoglycemia | Yes |
| E89.838 | Other postprocedural hypoglycemia | Yes |
Chapter 5: Mental, behavioral and neurodevelopmental disorders 1
| Code | Description | Billable |
|---|---|---|
| F64.A | Gender identity disorder, in remission | Yes |
Chapter 9: Diseases of the circulatory system 9
| Code | Description | Billable |
|---|---|---|
| I42.00 | Dilated cardiomyopathy, unspecified | Yes |
| I42.01 | Familial-genetic dilated cardiomyopathy | Yes |
| I42.09 | Other dilated cardiomyopathy | Yes |
| I42.81 | Arrhythmogenic cardiomyopathy | Yes |
| I42.89 | Other cardiomyopathies not elsewhere classified | Yes |
| I47.22 | Catecholaminergic polymorphic ventricular tachycardia [CPVT] | Yes |
| I49.81 | Brugada syndrome | Yes |
| I49.82 | Ventricular bigeminy | Yes |
| I49.89 | Other specified cardiac arrhythmias not elsewhere classified | Yes |
Chapter 10: Diseases of the respiratory system 7
| Code | Description | Billable |
|---|---|---|
| J34.83 | Odontogenic sinusitis | Header |
| J34.830 | Odontogenic sinusitis, maxillary sinus | Yes |
| J34.831 | Odontogenic sinusitis, ethmoid sinus | Yes |
| J34.832 | Odontogenic sinusitis, frontal sinus | Yes |
| J34.833 | Odontogenic sinusitis, sphenoid sinus | Yes |
| J34.839 | Odontogenic sinusitis, unspecified | Yes |
| J4B | Pulmonary mycetoma | Yes |
Chapter 11: Diseases of the digestive system 8
| Code | Description | Billable |
|---|---|---|
| K31.B | Hypertrophic pyloric stenosis, in childhood | Yes |
| K6A | Diseases of the pelvis, not elsewhere classified | Header |
| K6A.0 | Pelvic abscess | Header |
| K6A.01 | Prevesical abscess | Yes |
| K6A.09 | Other pelvic abscess | Yes |
| K6A.8 | Other diseases of the pelvis, not elsewhere classified | Yes |
| K74.0A | Hepatic fibrosis, moderate fibrosis | Yes |
| K76.83 | Intestinal failure-associated liver disease | Yes |
Chapter 12: Diseases of the skin and subcutaneous tissue 1
| Code | Description | Billable |
|---|---|---|
| L02.237 | Carbuncle of flank | Yes |
Chapter 13: Diseases of the musculoskeletal system and connective tissue 33
| Code | Description | Billable |
|---|---|---|
| M04.3 | VEXAS syndrome | Yes |
| M67.A | Plantar fasciitis | Header |
| M67.A0 | Plantar fasciitis, foot | Header |
| M67.A01 | Plantar fasciitis, right foot | Yes |
| M67.A02 | Plantar fasciitis, left foot | Yes |
| M67.A09 | Plantar fasciitis, unspecified foot | Yes |
| M72.20 | Plantar fascial fibromatosis, unspecified foot | Yes |
| M72.21 | Plantar fascial fibromatosis, right foot | Yes |
| M72.22 | Plantar fascial fibromatosis, left foot | Yes |
| M86.8X11 | Other osteomyelitis, right shoulder | Yes |
| M86.8X12 | Other osteomyelitis, left shoulder | Yes |
| M86.8X19 | Other osteomyelitis, unspecified shoulder | Yes |
| M86.8X21 | Other osteomyelitis, right upper arm | Yes |
| M86.8X22 | Other osteomyelitis, left upper arm | Yes |
| M86.8X29 | Other osteomyelitis, unspecified upper arm | Yes |
| M86.8X31 | Other osteomyelitis, right forearm | Yes |
| M86.8X32 | Other osteomyelitis, left forearm | Yes |
| M86.8X39 | Other osteomyelitis, unspecified forearm | Yes |
| M86.8X41 | Other osteomyelitis, right hand | Yes |
| M86.8X42 | Other osteomyelitis, left hand | Yes |
| M86.8X49 | Other osteomyelitis, unspecified hand | Yes |
| M86.8X51 | Other osteomyelitis, right thigh | Yes |
| M86.8X52 | Other osteomyelitis, left thigh | Yes |
| M86.8X59 | Other osteomyelitis, unspecified thigh | Yes |
| M86.8X61 | Other osteomyelitis, right lower leg | Yes |
| M86.8X62 | Other osteomyelitis, left lower leg | Yes |
| M86.8X69 | Other osteomyelitis, unspecified lower leg | Yes |
| M86.8X71 | Other osteomyelitis, right ankle and foot | Yes |
| M86.8X72 | Other osteomyelitis, left ankle and foot | Yes |
| M86.8X79 | Other osteomyelitis, unspecified ankle and foot | Yes |
| M86.8X80 | Other osteomyelitis, skull | Yes |
| M86.8X81 | Other osteomyelitis, face and sinuses | Yes |
| M86.8X89 | Other osteomyelitis, other site | Yes |
Chapter 14: Diseases of the genitourinary system 3
| Code | Description | Billable |
|---|---|---|
| N99.86 | Intraoperative and postprocedural complications and disorders of breast | Header |
| N99.860 | Intraoperative and postprocedural nipple ischemia | Yes |
| N99.861 | Intraoperative and postprocedural nipple necrosis | Yes |
Chapter 15: Pregnancy, childbirth and the puerperium 56
| Code | Description | Billable |
|---|---|---|
| O00.12 | Interstitial ectopic pregnancy without intrauterine pregnancy | Header |
| O00.121 | Right interstitial ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.122 | Left interstitial ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.129 | Unspecified interstitial ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.13 | Interstitial ectopic pregnancy with intrauterine pregnancy | Header |
| O00.131 | Right interstitial ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.132 | Left interstitial ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.139 | Unspecified interstitial ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.3 | Cesarean scar ectopic pregnancy | Header |
| O00.31 | Cesarean scar ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.32 | Cesarean scar ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.4 | Cervical ectopic pregnancy | Header |
| O00.41 | Cervical ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.42 | Cervical ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.5 | Cornual ectopic pregnancy | Header |
| O00.51 | Cornual ectopic pregnancy without intrauterine pregnancy | Header |
| O00.511 | Right cornual ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.512 | Left cornual ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.519 | Unspecified cornual ectopic pregnancy without intrauterine pregnancy | Yes |
| O00.52 | Cornual ectopic pregnancy with intrauterine pregnancy | Header |
| O00.521 | Right cornual ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.522 | Left cornual ectopic pregnancy with intrauterine pregnancy | Yes |
| O00.529 | Unspecified cornual ectopic pregnancy with intrauterine pregnancy | Yes |
| O31.4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more | Header |
| O31.40 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester | Header |
| O31.40X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, not applicable or unspecified | Yes |
| O31.40X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 1 | Yes |
| O31.40X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 2 | Yes |
| O31.40X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 3 | Yes |
| O31.40X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 4 | Yes |
| O31.40X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, fetus 5 | Yes |
| O31.40X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, unspecified trimester, other fetus | Yes |
| O31.41 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester | Header |
| O31.41X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, not applicable or unspecified | Yes |
| O31.41X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 1 | Yes |
| O31.41X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 2 | Yes |
| O31.41X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 3 | Yes |
| O31.41X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 4 | Yes |
| O31.41X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, fetus 5 | Yes |
| O31.41X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, first trimester, other fetus | Yes |
| O31.42 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester | Header |
| O31.42X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, not applicable or unspecified | Yes |
| O31.42X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 1 | Yes |
| O31.42X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 2 | Yes |
| O31.42X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 3 | Yes |
| O31.42X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 4 | Yes |
| O31.42X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, fetus 5 | Yes |
| O31.42X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, second trimester, other fetus | Yes |
| O31.43 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester | Header |
| O31.43X0 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, not applicable or unspecified | Yes |
| O31.43X1 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 1 | Yes |
| O31.43X2 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 2 | Yes |
| O31.43X3 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 3 | Yes |
| O31.43X4 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 4 | Yes |
| O31.43X5 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, fetus 5 | Yes |
| O31.43X9 | Continuing pregnancy after vanishing twin syndrome of one fetus or more, third trimester, other fetus | Yes |
Chapter 17: Congenital malformations, deformations, chromosomal abnormalities and genetic disorders 9
| Code | Description | Billable |
|---|---|---|
| Q87.A | Loeys-Dietz syndrome | Yes |
| QA1 | Genetic disorders associated with neoplasms, not elsewhere classified | Header |
| QA1.7 | Inherited neoplasm predisposition syndromes involving multiple systems, not elsewhere classified | Header |
| QA1.71 | Lynch syndrome | Yes |
| QA1.79 | Other inherited neoplasm predisposition syndrome of multiple systems | Header |
| QA1.790 | Familial cancer syndrome with pathogenic BRCA1 mutation | Yes |
| QA1.791 | Familial cancer syndrome with pathogenic BRCA2 mutation | Yes |
| QA1.792 | Li Fraumeni syndrome | Yes |
| QA1.798 | Other inherited neoplasm predisposition syndrome of multiple systems | Yes |
Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified 1
| Code | Description | Billable |
|---|---|---|
| R78.72 | Abnormal gadolinium level in blood | Yes |
Chapter 19: Injury, poisoning and certain other consequences of external causes 85
| Code | Description | Billable |
|---|---|---|
| T52.81 | Toxic effects of alkenes | Header |
| T52.811 | Toxic effect of alkenes, accidental (unintentional) | Header |
| T52.811A | Toxic effect of alkenes, accidental (unintentional), initial encounter | Yes |
| T52.811D | Toxic effect of alkenes, accidental (unintentional), subsequent encounter | Yes |
| T52.811S | Toxic effect of alkenes, accidental (unintentional), sequela | Yes |
| T52.812 | Toxic effect of alkenes, intentional self-harm | Header |
| T52.812A | Toxic effect of alkenes, intentional self-harm, initial encounter | Yes |
| T52.812D | Toxic effect of alkenes, intentional self-harm, subsequent encounter | Yes |
| T52.812S | Toxic effect of alkenes, intentional self-harm, sequela | Yes |
| T52.813 | Toxic effect of alkenes, assault | Header |
| T52.813A | Toxic effect of alkenes, assault, initial encounter | Yes |
| T52.813D | Toxic effect of alkenes, assault, subsequent encounter | Yes |
| T52.813S | Toxic effect of alkenes, assault, sequela | Yes |
| T52.814 | Toxic effect of alkenes, undetermined | Header |
| T52.814A | Toxic effect of alkenes, undetermined, initial encounter | Yes |
| T52.814D | Toxic effect of alkenes, undetermined, subsequent encounter | Yes |
| T52.814S | Toxic effect of alkenes, undetermined, sequela | Yes |
| T52.82 | Toxic effects of cycloparaffins | Header |
| T52.821 | Toxic effect of cycloparaffins, accidental (unintentional) | Header |
| T52.821A | Toxic effect of cycloparaffins, accidental (unintentional), initial encounter | Yes |
| T52.821D | Toxic effect of cycloparaffins, accidental (unintentional), subsequent encounter | Yes |
| T52.821S | Toxic effect of cycloparaffins, accidental (unintentional), sequela | Yes |
| T52.822 | Toxic effect of cycloparaffins, intentional self-harm | Header |
| T52.822A | Toxic effect of cycloparaffins, intentional self-harm, initial encounter | Yes |
| T52.822D | Toxic effect of cycloparaffins, intentional self-harm, subsequent encounter | Yes |
| T52.822S | Toxic effect of cycloparaffins, intentional self-harm, sequela | Yes |
| T52.823 | Toxic effect of cycloparaffins, assault | Header |
| T52.823A | Toxic effect of cycloparaffins, assault, initial encounter | Yes |
| T52.823D | Toxic effect of cycloparaffins, assault, subsequent encounter | Yes |
| T52.823S | Toxic effect of cycloparaffins, assault, sequela | Yes |
| T52.824 | Toxic effect of cycloparaffins, undetermined | Header |
| T52.824A | Toxic effect of cycloparaffins, undetermined, initial encounter | Yes |
| T52.824D | Toxic effect of cycloparaffins, undetermined, subsequent encounter | Yes |
| T52.824S | Toxic effect of cycloparaffins, undetermined, sequela | Yes |
| T52.89 | Toxic effects of other organic solvents | Header |
| T52.891 | Toxic effect of other organic solvents, accidental (unintentional) | Header |
| T52.891A | Toxic effect of other organic solvents, accidental (unintentional), initial encounter | Yes |
| T52.891D | Toxic effect of other organic solvents, accidental (unintentional), subsequent encounter | Yes |
| T52.891S | Toxic effect of other organic solvents, accidental (unintentional), sequela | Yes |
| T52.892 | Toxic effect of other organic solvents, intentional self-harm | Header |
| T52.892A | Toxic effect of other organic solvents, intentional self-harm, initial encounter | Yes |
| T52.892D | Toxic effect of other organic solvents, intentional self-harm, subsequent encounter | Yes |
| T52.892S | Toxic effect of other organic solvents, intentional self-harm, sequela | Yes |
| T52.893 | Toxic effect of other organic solvents, assault | Header |
| T52.893A | Toxic effect of other organic solvents, assault, initial encounter | Yes |
| T52.893D | Toxic effect of other organic solvents, assault, subsequent encounter | Yes |
| T52.893S | Toxic effect of other organic solvents, assault, sequela | Yes |
| T52.894 | Toxic effect of other organic solvents, undetermined | Header |
| T52.894A | Toxic effect of other organic solvents, undetermined, initial encounter | Yes |
| T52.894D | Toxic effect of other organic solvents, undetermined, subsequent encounter | Yes |
| T52.894S | Toxic effect of other organic solvents, undetermined, sequela | Yes |
| T59.82 | Toxic effects of hexamethylene diisocyanate | Header |
| T59.821 | Toxic effect of hexamethylene diisocyanate, accidental (unintentional) | Header |
| T59.821A | Toxic effect of hexamethylene diisocyanate, accidental (unintentional), initial encounter | Yes |
| T59.821D | Toxic effect of hexamethylene diisocyanate, accidental (unintentional), subsequent encounter | Yes |
| T59.821S | Toxic effect of hexamethylene diisocyanate, accidental (unintentional), sequela | Yes |
| T59.822 | Toxic effect of hexamethylene diisocyanate, intentional self-harm | Header |
| T59.822A | Toxic effect of hexamethylene diisocyanate, intentional self-harm, initial encounter | Yes |
| T59.822D | Toxic effect of hexamethylene diisocyanate, intentional self-harm, subsequent encounter | Yes |
| T59.822S | Toxic effect of hexamethylene diisocyanate, intentional self-harm, sequela | Yes |
| T59.823 | Toxic effect of hexamethylene diisocyanate, assault | Header |
| T59.823A | Toxic effect of hexamethylene diisocyanate, assault, initial encounter | Yes |
| T59.823D | Toxic effect of hexamethylene diisocyanate, assault, subsequent encounter | Yes |
| T59.823S | Toxic effect of hexamethylene diisocyanate, assault, sequela | Yes |
| T59.824 | Toxic effect of hexamethylene diisocyanate, undetermined | Header |
| T59.824A | Toxic effect of hexamethylene diisocyanate, undetermined, initial encounter | Yes |
| T59.824D | Toxic effect of hexamethylene diisocyanate, undetermined, subsequent encounter | Yes |
| T59.824S | Toxic effect of hexamethylene diisocyanate, undetermined, sequela | Yes |
| T65.85 | Toxic effect of medetomidine | Header |
| T65.851 | Toxic effect of medetomidine, accidental (unintentional) | Header |
| T65.851A | Toxic effect of medetomidine, accidental (unintentional), initial encounter | Yes |
| T65.851D | Toxic effect of medetomidine, accidental (unintentional), subsequent encounter | Yes |
| T65.851S | Toxic effect of medetomidine, accidental (unintentional), sequela | Yes |
| T65.852 | Toxic effect of medetomidine, intentional self-harm | Header |
| T65.852A | Toxic effect of medetomidine, intentional self-harm, initial encounter | Yes |
| T65.852D | Toxic effect of medetomidine, intentional self-harm, subsequent encounter | Yes |
| T65.852S | Toxic effect of medetomidine, intentional self-harm, sequela | Yes |
| T65.853 | Toxic effect of medetomidine, assault | Header |
| T65.853A | Toxic effect of medetomidine, assault, initial encounter | Yes |
| T65.853D | Toxic effect of medetomidine, assault, subsequent encounter | Yes |
| T65.853S | Toxic effect of medetomidine, assault, sequela | Yes |
| T65.854 | Toxic effect of medetomidine, undetermined | Header |
| T65.854A | Toxic effect of medetomidine, undetermined, initial encounter | Yes |
| T65.854D | Toxic effect of medetomidine, undetermined, subsequent encounter | Yes |
| T65.854S | Toxic effect of medetomidine, undetermined, sequela | Yes |
Chapter 21: Factors influencing health status and contact with health services 17
| Code | Description | Billable |
|---|---|---|
| Z68.18 | Body mass index [BMI] 18.4 or less, adult | Yes |
| Z68.19 | Body mass index [BMI] 18.5-19.9, adult | Yes |
| Z77.013 | Contact with and (suspected) exposure to gadolinium | Yes |
| Z77.32 | Contact with and (suspected) exposure to burn pits in war theater | Yes |
| Z77.33 | Contact with and (suspected) exposure to Agent Orange | Yes |
| Z77.4 | Contact with and (suspected) exposure to blast overpressure | Header |
| Z77.40 | Contact with and (suspected) exposure to unspecified blast overpressure | Yes |
| Z77.41 | Contact with and (suspected) exposure to low-level blast overpressure | Yes |
| Z77.42 | Contact with and (suspected) exposure to high-level blast overpressure | Yes |
| Z77.49 | Contact with and (suspected) exposure to other blast overpressure | Yes |
| Z86.17 | Personal history of Clostridioides difficile infection | Yes |
| Z87.8901 | Personal history of social gender transition | Yes |
| Z87.8902 | Personal history of medical gender transition | Yes |
| Z87.8903 | Personal history of surgical gender transition | Yes |
| Z87.8904 | Personal history of intersex surgery | Yes |
| Z87.8909 | Personal history of unspecified gender transition | Yes |
| Z87.893 | Personal history of gender detransition | Yes |
Questions about the changeover
Which ICD-10 codes stop being billable on 2026-10-01?
15 of them, and they are the ones most likely to catch you out, because nothing about them looks wrong.
They are not deleted. They keep their code and their description. They simply become category headers, which means they group more specific codes rather than standing on their own, and a claim carrying one denies.
I42.0, dilated cardiomyopathy, is the clearest example: an everyday cardiology code that is billable today and a header from 1 October. The full list is on this page, and you can check individual codes with the code checker.
How many ICD-10 codes change for FY2027?
238 added, 21 deleted, 4 reworded and 15 with a changed billable status.
That takes the code set from 98,186 entries to 98,403, of which 74,879 are billable.
These figures are not transcribed from an announcement. They are derived by diffing the two published code files against each other, so they are the changes themselves rather than somebody's summary of them.
When exactly do the new codes take effect?
Dates of service on and after 2026-10-01. There is no phase-in and no grace period.
A claim for a date of service in September uses the FY2026 set even if you submit it in November. A claim for 1 October uses FY2027. So both sets are live at once for as long as you have unbilled September work, which is exactly when the mistakes happen.
Do I need to do anything about the reworded codes?
Usually not. A reworded code keeps its number and its billable status. Only the description text changes, so claims are unaffected.
It matters if you keep your own copy of the descriptions in a superbill, a template or a cheat sheet, because those will quietly disagree with the payer's copy until you update them. All 4 are listed below with the old and new wording side by side.
Where does this list come from?
From the two published NCHS code files, diffed against each other. Snapshot taken 2026-08-31.
Nothing is transcribed and nothing is summarised. If a code appears here as deleted, it is because it is present in the FY2026 file and absent from the FY2027 one.
ICD-10-CM is a work of the United States federal government and is not subject to copyright, which is why this can be published in full.
Notes and sources
Derived, not transcribed. Every row on this page comes from diffing the two published NCHS order files against each other: FY2026 (98,186 entries) against FY2027 (98,403). A code appears as deleted because it is in one file and not the other, not because a summary said so.
Files from ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/, snapshot 2026-08-31. Chapter groupings are from the FY2027 Official Guidelines for Coding and Reporting.
Licensing. ICD-10-CM is a work of the United States federal government and is not subject to copyright under 17 U.S.C. 105, which is why the full lists can be published here.
This is not coding advice. Verify against your encoder before changing anything. Tell me if a row here disagrees with the addenda.