Complications and ill-defined descriptions of heart disease
In Other forms of heart disease (I30-I5A), chapter 9: Diseases of the Circulatory System
10 billable codes under I51: 2 are an MCC, 2 are a CC; 4 map to HCC 227 (Cardiomyopathy/Myocarditis), HCC 229 (Unstable Angina and Other Acute Ischemic Heart Disease).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes2: not included here, code separately if applicable
- heart disease specified as rheumatic (I00-I09)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers hypertension with heart and kidney disease, coronary artery disease with angina, perioperative stroke, cerebrovascular sequelae, and acute myocardial infarction types and timing.
- Hypertension (page 50)
- Atherosclerotic Coronary Artery Disease and Angina (page 52)
- Intraoperative and Postprocedural Cerebrovascular Accident (page 53)
- Sequelae of Cerebrovascular Disease (page 53)
- Acute myocardial infarction (AMI) (page 54)
All codes under I51
I51 can't be used on a claim. Pick a billable code below; grey headings group them.
- 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
- I51.81Takotsubo syndrome
- I51.89Other ill-defined heart diseases
- I51.9Heart disease, unspecified
I51 MS-DRGs
As the principal diagnosis, the billable codes under I51 group to these 7 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 302 Atherosclerosis with MCC (4 of 10 codes)
- DRG 303 Atherosclerosis without MCC (4 of 10 codes)
- DRG 314 Other Circulatory System Diagnoses with MCC (4 of 10 codes)
- DRG 315 Other Circulatory System Diagnoses with CC (4 of 10 codes)
- DRG 316 Other Circulatory System Diagnoses without CC/MCC (4 of 10 codes)
- DRG 306 Cardiac Congenital and Valvular Disorders with MCC (2 of 10 codes)
- DRG 307 Cardiac Congenital and Valvular Disorders without MCC (2 of 10 codes)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Heart Diseases
Heart disease is a general term that includes many types of heart problems. It's a type of cardiovascular disease, which means heart and blood vessel disease.
Read more about heart diseases on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.