I51.8
⚠ Non-billable (Header)Other ill-defined heart diseases
Diseases of the circulatory system (I00-I99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
inherited from I51Rules from parent category I51: Complications and ill-defined descriptions of heart disease
- • heart disease specified as rheumatic (I00-I09)
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CodeI51.8
BillableNo — Header code
ParentI51
CategoryDiseases of the circulatory system (I00-I99)
Excludes10 rule(s)
Excludes21 note(s)
Child codes2
Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)