I42.9 Cardiomyopathy, unspecified
Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.
Applicable to
- Cardiomyopathy (primary) (secondary) NOS
Applies from I42 Cardiomyopathy
Includes
Excludes2 (not included here)
- ischemic cardiomyopathy (I25.5)
- peripartum cardiomyopathy (O90.3)
- ventricular hypertrophy (I51.7)
Code first
- pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)
Risk adjustment (HCC)
- CMS-HCC V28: HCC 227 — Cardiomyopathy/Myocarditis
- CMS-HCC V22: HCC 85 — Congestive Heart Failure
- RxHCC V08: HCC 186 — Heart Failure
- ESRD V24: HCC 85
MS-DRG index
Defines the logic of DRG(s) 314-316 in MDC 05.
Approximate ICD-9-CM (GEMs)
425.4 Other primary cardiomyopathies (approximate)425.9 Secondary cardiomyopathy, unspecified (approximate)
Code annotations containing back-references to I42.9
Back-references to I42
- Code First:
I5A Non-ischemic myocardial injury (non-traumatic) ("cardiomyopathy (I42.-)")
Diagnosis Index entries for I42.9
- Cardiomyopathy (familial) (idiopathic)
- Cardiomyopathy (familial) (idiopathic) › secondary
- Cardiopathy › idiopathic
- Disease, diseased › myocardium, myocardial › primary (idiopathic)
- Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic)
- Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) › secondary
Nearby codes
I42.4 Endocardial fibroelastosisI42.5 Other restrictive cardiomyopathyI42.6 Alcoholic cardiomyopathyI42.7 Cardiomyopathy due to drug and external agentI42.8 Other cardiomyopathiesI42.9 Cardiomyopathy, unspecified (this code)