I20.9 — Angina pectoris, unspecified
I20.9 is a billable, specific ICD-10-CM code for angina pectoris, unspecified. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Angina NOS
- Anginal syndrome
- Cardiac angina
- Ischemic chest pain
Other codes that can never be billed with I20.9
These codes carry an Excludes1 note pointing at I20.9. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I20.9 alone.
- I25.119Atherosclerotic heart disease of native coronary artery with unspecified angina pectoris
- I25.709Atherosclerosis of coronary artery bypass graft(s), unspecified, with unspecified angina pectoris
- I25.719Atherosclerosis of autologous vein coronary artery bypass graft(s) with unspecified angina pectoris
- I25.729Atherosclerosis of autologous artery coronary artery bypass graft(s) with unspecified angina pectoris
- I25.739Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unspecified angina pectoris
- I25.799Atherosclerosis of other coronary artery bypass graft(s) with unspecified angina pectoris
Risk adjustment
I20.9 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
I20.9 is named in 38 Medicare coverage policies — 38 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
- A53775Billing and Coding: Frequency and Duration for Cardiac Rehabilitation and Intensive Cardiac Rehabilitation
- A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing
- A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing
How I20.9 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 I20.9.
- Angina(attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor)
- Status›anginosus
- Syndrome›X
- Pain›chest›ischemic
Related codes at this level
Codes that share I20. If I20.9 is not quite right, the correct code is usually one of these.
Questions about I20.9
- Is I20.9 a billable ICD-10-CM code?
- Yes. I20.9 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I20.9 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Ischemic heart diseases (I20-I25).