I42.7 Cardiomyopathy due to drug and external agent

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Code first

• poisoning due to drug or toxin, if applicable (T36-T65 with fifth or sixth character 1-4)

Use additional code

• code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

Applies from I42 Cardiomyopathy

Includes

• myocardiopathy

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 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)

• 425.9 Secondary cardiomyopathy, unspecified (approximate)

Code annotations containing back-references to I42.7

Back-references to I42

• Code First: I5A Non-ischemic myocardial injury (non-traumatic) ("cardiomyopathy (I42.-)")

Diagnosis Index entries for I42.7

• Cardiomyopathy (familial) (idiopathic) › due to › drugs
• Cardiomyopathy (familial) (idiopathic) › due to › external agents NEC
• Cardiomyopathy (familial) (idiopathic) › toxic NEC
• Myocardiopathy (congestive) (constrictive) (familial) (hypertrophic nonobstructive) (idiopathic) (infiltrative) (obstructive) (primary) (restrictive) (sporadic) › toxic NEC

Nearby codes

• I42.2 Other hypertrophic cardiomyopathy
• I42.3 Endomyocardial (eosinophilic) disease
• I42.4 Endocardial fibroelastosis
• I42.5 Other restrictive cardiomyopathy
• I42.6 Alcoholic cardiomyopathy
• I42.7 Cardiomyopathy due to drug and external agent (this code)
• I42.8 Other cardiomyopathies
• I42.9 Cardiomyopathy, unspecified