A36.81 Diphtheritic cardiomyopathy

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

Applicable to

• Diphtheritic myocarditis

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)

• 032.82 Diphtheritic myocarditis

Code annotations containing back-references to A36.81

Back-references to A36.81

• Type 1 Excludes: I41 Myocarditis in diseases classified elsewhere ("diphtheritic (A36.81)")
• Type 1 Excludes: I43 Cardiomyopathy in diseases classified elsewhere ("diphtheria (A36.81)")

Diagnosis Index entries for A36.81

• Diphtheria, diphtheritic (gangrenous) (hemorrhagic) › myocarditis
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › diphtheritic
• Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile) › in (due to) › diphtheria

Nearby codes

• A36.0 Pharyngeal diphtheria
• A36.1 Nasopharyngeal diphtheria
• A36.2 Laryngeal diphtheria
• A36.3 Cutaneous diphtheria
• A36.8 Other diphtheria
• A36.81 Diphtheritic cardiomyopathy (this code)
• A36.82 Diphtheritic radiculomyelitis
• A36.83 Diphtheritic polyneuritis
• A36.84 Diphtheritic tubulo-interstitial nephropathy
• A36.85 Diphtheritic cystitis
• A36.86 Diphtheritic conjunctivitis