I20.81 — Angina pectoris with coronary microvascular dysfunction
I20.81 is a billable, specific ICD-10-CM code for angina pectoris with coronary microvascular dysfunction. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Angina pectoris with coronary microvascular disease
Risk adjustment
I20.81 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
I20.81 is named in 53 Medicare coverage policies — 53 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A53775Billing and Coding: Frequency and Duration for Cardiac Rehabilitation and Intensive Cardiac Rehabilitation
- A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing
How I20.81 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I20.81.
- Angina›with›coronary microvascular disease
- Angina›with›coronary microvascular dysfunction
- Dysfunction›coronary microvascular›with›angina pectoris
- Disease, diseased›coronary›microvascular›with›angina pectoris
Related codes at this level
Codes that share I20.8. If I20.81 is not quite right, the correct code is usually one of these.
Questions about I20.81
- Is I20.81 a billable ICD-10-CM code?
- Yes. I20.81 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I20.81 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).