Coding and coverage · ICD-10-CM
I51 Complications and ill-defined descriptions of heart disease
Report one of the more specific codes below.
Codes under this one
- I51.0 Cardiac septal defect, acquired
- I51.1 Rupture of chordae tendineae, not elsewhere classified
- I51.2 Rupture of papillary muscle, not elsewhere classified
- I51.3 Intracardiac thrombosis, not elsewhere classified
- I51.4 Myocarditis, unspecified
- I51.5 Myocardial degeneration
- I51.7 Cardiomegaly
- I51.8 Other ill-defined heart diseasesHeader
- I51.9 Heart disease, unspecified
Instructional notes
Chapter 9
Excludes2Not included here: the patient may have both; report both when both are present.
- 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.-)
Chapter 9: Diseases of the circulatory system · I30-I5A Other forms of heart disease (I30-I5A)
Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.
Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.