I51.9 — Heart disease, unspecified
I51.9 is a billable, specific ICD-10-CM code for heart disease, unspecified. It is valid for submission on a claim.
Risk adjustment
I51.9 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
I51.9 is named in 9 Medicare coverage policies — 9 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56625Billing and Coding: Echocardiography
- A56781Billing and Coding: Transthoracic Echocardiography (TTE)
- A56943Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment
- A57037Billing and Coding: MolDX: Biomarkers in Cardiovascular Risk Assessment
How I51.9 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I51.9.
- Cardiopathy
- Complication›heart
- Disease, diseased›heart(organic)
- Dysfunction›ventricular
- Lesion›cardiac
- Morbus›cordis
- Disease, diseased›heart›cryptogenic
Related codes at this level
Codes that share I51. If I51.9 is not quite right, the correct code is usually one of these.
- I51.0Cardiac septal defect, acquired
- I51.1Rupture of chordae tendineae, not elsewhere classified
- I51.2Rupture of papillary muscle, not elsewhere classified
- I51.3Intracardiac thrombosis, not elsewhere classified
- I51.4Myocarditis, unspecified
- I51.5Myocardial degeneration
- I51.7Cardiomegaly
- I51.8Other ill-defined heart diseases
Questions about I51.9
- Is I51.9 a billable ICD-10-CM code?
- Yes. I51.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I51.9 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Other forms of heart disease (I30-I5A).