ICD-10-CM 2027
ICD-10 code for Cyanotic heart disease
From the official ICD-10-CM alphabetic index entry “Cyanotic heart disease”. Page updated September 29, 2026.
About coding Cyanotic heart disease
The ICD-10-CM code for Cyanotic heart disease is I24.9 (Acute ischemic heart disease, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on I24.9.
Within I24, choose I24.9 (Acute ischemic heart disease, unspecified) only when documentation doesn't support a more specific option: acute coronary thrombosis not resulting in myocardial infarction (I24.0), Dressler's syndrome (I24.1) and other forms of acute ischemic heart disease (I24.8).
Don't report I24.9 together with the conditions in its Excludes1 note: ischemic heart disease (chronic) NOS (I25.9).
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.
More specific Cyanotic heart disease codes (official index)
- congenital Q24.9 — Congenital malformation of heart, unspecified
Don't confuse with (Excludes1 for I24.9)
- ischemic heart disease (chronic) NOS (I25.9)
Common questions about Cyanotic heart disease ICD-10 codes
What is the ICD-10 code for Cyanotic heart disease?
- I24.9 — Acute ischemic heart disease, unspecified. More specific codes apply when the documentation supports them: Q24.9.
What is the ICD-10 code for congenital cyanotic heart disease?
- Q24.9 — Congenital malformation of heart, unspecified.
Is I24.9 billable?
- Yes. I24.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I24.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I24.9 as a principal diagnosis.
Is I24.9 a CC or MCC?
- I24.9 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.