ICD-10-CM 2027
ICD-10 code for CHF (congestive heart failure)
Confirmed by the official ICD-10-CM index entry “dysfunction › ventricular › with congestive heart failure”. Page updated September 29, 2026.
About coding CHF
The ICD-10-CM code for CHF (congestive heart failure) is I50.9 (Heart failure, unspecified). The official index lists 22 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I50.9.
It is also searched as heart failure.
Within I50, choose I50.9 (unspecified) only when documentation doesn't support a more specific option: left ventricular failure, unspecified (I50.1), systolic (congestive) heart failure (I50.2), diastolic (congestive) heart failure (I50.3), combined systolic (congestive) and diastolic (congestive) heart failure (I50.4) and other heart failure (I50.8).
The conditions in its Excludes2 note aren't part of I50.9, but may be coded alongside it if the patient has both: fluid overload unrelated to congestive heart failure (E87.70).
Code first: heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8), heart failure due to hypertension (I11.0), heart failure due to hypertension with chronic kidney disease (I13.-), heart failure following surgery (I97.13-) and 2 more.
Related CHF codes
- I50.1 Left ventricular failure, unspecified
- I50.20 Unspecified systolic (congestive) heart failure
- I50.21 Acute systolic (congestive) heart failure
- I50.22 Chronic systolic (congestive) heart failure
- I50.23 Acute on chronic systolic (congestive) heart failure
- I50.30 Unspecified diastolic (congestive) heart failure
- I50.31 Acute diastolic (congestive) heart failure
- I50.32 Chronic diastolic (congestive) heart failure
- I50.33 Acute on chronic diastolic (congestive) heart failure
- I50.40 Unspecified combined systolic (congestive) and diastolic (congestive) heart failure
- I50.41 Acute combined systolic (congestive) and diastolic (congestive) heart failure
- I50.42 Chronic combined systolic (congestive) and diastolic (congestive) heart failure
- I50.43 Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure
- I50.810 Right heart failure, unspecified
- I50.811 Acute right heart failure
- I50.812 Chronic right heart failure
- I50.813 Acute on chronic right heart failure
- I50.814 Right heart failure due to left heart failure
- I50.82 Biventricular heart failure
- I50.83 High output heart failure
- I50.84 End stage heart failure
- I50.89 Other heart failure
Common questions about CHF ICD-10 codes
What is the ICD-10 code for CHF?
- I50.9 — Heart failure, unspecified. More specific codes apply when the documentation supports them: I50.1, I50.20, I50.21, I50.22 and others below.
What is the ICD-10 code for left ventricular failure, unspecified?
- I50.1 — Left ventricular failure, unspecified.
What is the ICD-10 code for unspecified systolic (congestive) heart failure?
- I50.20 — Unspecified systolic (congestive) heart failure.
What is the ICD-10 code for acute systolic (congestive) heart failure?
- I50.21 — Acute systolic (congestive) heart failure.
What is the ICD-10 code for chronic systolic (congestive) heart failure?
- I50.22 — Chronic systolic (congestive) heart failure.
What is the ICD-10 code for acute on chronic systolic (congestive) heart failure?
- I50.23 — Acute on chronic systolic (congestive) heart failure.
What is the ICD-10 code for unspecified diastolic (congestive) heart failure?
- I50.30 — Unspecified diastolic (congestive) heart failure.
Is I50.9 billable?
- Yes. I50.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I50.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I50.9 as a principal diagnosis.
Is I50.9 a CC or MCC?
- No. I50.9 is neither a CC nor an MCC under MS-DRG v44.0.