I51Header code — not billable
Complications and ill-defined descriptions of heart disease
- Chapter
- 9. Diseases of the circulatory system
- Category
- I51
- Effective date
- October 1, 2026
Related codes in category I51
I51.0Cardiac septal defect, acquiredYesI51.1Rupture of chordae tendineae, not elsewhere classifiedYesI51.2Rupture of papillary muscle, not elsewhere classifiedYesI51.3Intracardiac thrombosis, not elsewhere classifiedYesI51.4Myocarditis, unspecifiedYesI51.5Myocardial degenerationYesI51.7CardiomegalyYesI51.8Other ill-defined heart diseasesI51.81Takotsubo syndromeYesI51.89Other ill-defined heart diseasesYesI51.9Heart disease, unspecifiedYes
Frequently asked questions
What is ICD-10 code I51?
I51 is an ICD-10-CM diagnosis code for Complications and ill-defined descriptions of heart disease.
Is I51 a billable code?
No. I51 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is I51 in?
I51 falls under Chapter 9: Diseases of the circulatory system.
When did I51 become effective?
I51 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to I51?
I51 belongs to category I51, which includes 11 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.