ICD-10-CM 2027
ICD-10 code for coronary insufficiency
From the official ICD-10-CM alphabetic index entry “Insufficiency, insufficient › coronary (acute or subacute)”. Page updated September 29, 2026.
About coding coronary insufficiency
The ICD-10-CM code for coronary insufficiency is I24.89 (Other forms of acute ischemic heart disease). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on I24.89.
Within I24.8, choose I24.89 (Other forms of acute ischemic heart disease) only when documentation doesn't support a more specific option: acute coronary microvascular dysfunction (I24.81).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 311 (Angina Pectoris, relative weight 0.6684), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific coronary insufficiency codes (official index)
- chronic or with a stated duration of over 4 weeks I25.89 — Other forms of chronic ischemic heart disease
Common questions about coronary insufficiency ICD-10 codes
What is the ICD-10 code for coronary insufficiency?
- I24.89 — Other forms of acute ischemic heart disease. More specific codes apply when the documentation supports them: I25.89.
Is I24.89 billable?
- Yes. I24.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I24.89 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I24.89 as a principal diagnosis.
Is I24.89 a CC or MCC?
- I24.89 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.