I42 — Cardiomyopathy
Is I42 billable?
No — I42 is a non-billable header code. I42 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 13 billable codes beneath I42.
Billable codes under this header
- I42.1Obstructive hypertrophic cardiomyopathy
- I42.2Other hypertrophic cardiomyopathy
- I42.3Endomyocardial (eosinophilic) disease
- I42.4Endocardial fibroelastosis
- I42.5Other restrictive cardiomyopathy
- I42.6Alcoholic cardiomyopathy
- I42.7Cardiomyopathy due to drug and external agent
- I42.9Cardiomyopathy, unspecified
- I42.00Dilated cardiomyopathy, unspecified
- I42.01Familial-genetic dilated cardiomyopathy
- I42.09Other dilated cardiomyopathy
- I42.81Arrhythmogenic cardiomyopathy
- I42.89Other cardiomyopathies not elsewhere classified
I42 at a glance
| Code | I42 |
|---|---|
| Description | Cardiomyopathy |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Code first
The underlying condition below must be sequenced before I42. I42 describes a manifestation and cannot be the principal or first-listed diagnosis.
- pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Excludes2 — not included here
The conditions below are not part of I42, but a patient may have both at the same time. When documentation supports it, I42 and the excluded code may both be reported.
Includes
Conditions classified to I42.
- myocardiopathy
Excludes2 — not included here — inherited from Chapter 9
The conditions below are not part of I42, but a patient may have both at the same time. When documentation supports it, I42 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- transient cerebral ischemic attacks and related syndromes (G45.-)
What codes fall under I42? (10)
- I42.0Dilated cardiomyopathynot billable
- I42.1Obstructive hypertrophic cardiomyopathy
- I42.2Other hypertrophic cardiomyopathy
- I42.3Endomyocardial (eosinophilic) disease
- I42.4Endocardial fibroelastosis
- I42.5Other restrictive cardiomyopathy
- I42.6Alcoholic cardiomyopathy
- I42.7Cardiomyopathy due to drug and external agent
- I42.8Other cardiomyopathiesnot billable
- I42.9Cardiomyopathy, unspecified
How long has I42 existed?
I42 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.