ICD-10-CM 2027
ICD-10 code for coronary microvascular dysfunction
From the official ICD-10-CM alphabetic index entry “Dysfunction › coronary microvascular”. Page updated September 29, 2026.
About coding coronary microvascular dysfunction
The ICD-10-CM code for coronary microvascular dysfunction is I25.85 (Chronic coronary microvascular dysfunction). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I25.85.
Within I25.8 (other forms of chronic ischemic heart disease), I25.85 is specifically for chronic coronary microvascular dysfunction. Related codes cover atherosclerosis of other coronary vessels without angina pectoris (I25.81), chronic total occlusion of coronary artery (I25.82), coronary atherosclerosis due to lipid rich plaque (I25.83), coronary atherosclerosis due to calcified coronary lesion (I25.84) and other forms of chronic ischemic heart disease (I25.89).
Use an additional code to identify: chronic total occlusion of coronary artery (I25.82), exposure to environmental tobacco smoke (Z77.22), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31), tobacco dependence (F17.-) and 1 more.
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific coronary microvascular dysfunction codes (official index)
Common questions about coronary microvascular dysfunction ICD-10 codes
What is the ICD-10 code for coronary microvascular dysfunction?
- I25.85 — Chronic coronary microvascular dysfunction. More specific codes apply when the documentation supports them: I20.81, I21.B, I24.81, I25.85.
What is the ICD-10 code for acute coronary microvascular dysfunction?
- I24.81 — Acute coronary microvascular dysfunction.
What is the ICD-10 code for chronic coronary microvascular dysfunction?
- I25.85 — Chronic coronary microvascular dysfunction.
Is I25.85 billable?
- Yes. I25.85 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I25.85 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I25.85 as a principal diagnosis.
Is I25.85 a CC or MCC?
- No. I25.85 is neither a CC nor an MCC under MS-DRG v44.0.