I51.9 Heart disease, unspecified

Billable ICD-10-CM code, FY2026.

Applies from I51 Complications and ill-defined descriptions of heart disease

Excludes2 (not included here)

• heart disease specified as rheumatic (I00-I09)

MS-DRG index

Defines the logic of DRG(s) 302-303 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 429.9 Heart disease, unspecified (approximate)

Diagnosis Index entries for I51.9

• Cardiopathy
• Complication (s) (from) (of) › heart
• Disease, diseased › heart (organic)
• Disease, diseased › heart (organic) › cryptogenic
• Dysfunction › ventricular
• Lesion (s) (nontraumatic) › cardiac
• Morbus › cordis

Nearby codes

• I51.5 Myocardial degeneration
• I51.7 Cardiomegaly
• I51.8 Other ill-defined heart diseases
• I51.81 Takotsubo syndrome
• I51.89 Other ill-defined heart diseases
• I51.9 Heart disease, unspecified (this code)