I51
⚠ Non-billable (Header)Complications and ill-defined descriptions of heart disease
Diseases of the circulatory system (I00-I99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
directMay be coded together if both conditions coexist
- • heart disease specified as rheumatic (I00-I09)
Child Codes (9)
I51.0Cardiac septal defect, acquiredI51.1Rupture of chordae tendineae, not elsewhere classifiedI51.2Rupture of papillary muscle, not elsewhere classifiedI51.3Intracardiac thrombosis, not elsewhere classifiedI51.4Myocarditis, unspecifiedI51.5Myocardial degenerationI51.7CardiomegalyI51.8Other ill-defined heart diseasesI51.9Heart disease, unspecified
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CodeI51
BillableNo — Header code
CategoryDiseases of the circulatory system (I00-I99)
Excludes10 rule(s)
Excludes21 note(s)
Child codes9
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)