I20.0: Unstable angina
I20.0 is a billable, specific ICD-10-CM code for unstable angina. It is valid for submission on a claim.
Check I20.0 with the rest of the claim: free scrubberInclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Accelerated angina
- Crescendo angina
- De novo effort angina
- Intermediate coronary syndrome
- Preinfarction syndrome
- Worsening effort angina
Excludes1 inherited from the categories above I20.0
A category’s note binds every code beneath it.
Other codes that can never be billed with I20.0
Their own Excludes1 notes name this code, so the conflict is not listed above.
- I24Other acute ischemic heart diseases
- I25.110Atherosclerotic heart disease of native coronary artery with unstable angina pectoris
- I25.700Atherosclerosis of coronary artery bypass graft(s), unspecified, with unstable angina pectoris
- I25.710Atherosclerosis of autologous vein coronary artery bypass graft(s) with unstable angina pectoris
- I25.720Atherosclerosis of autologous artery coronary artery bypass graft(s) with unstable angina pectoris
- I25.730Atherosclerosis of nonautologous biological coronary artery bypass graft(s) with unstable angina pectoris
- I25.790Atherosclerosis of other coronary artery bypass graft(s) with unstable angina pectoris
Risk adjustment
I20.0 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 229 Unstable Angina and Other Acute Ischemic Heart Disease0.240 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score. Look up the whole chart to see which of its HCCs the hierarchy would zero.
Medicare coverage
I20.0 is named in 42 Medicare coverage policies: 42 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A56423Billing and Coding: Cardiology Non-emergent Outpatient Stress Testing
- A56425Billing and Coding: B-type Natriuretic Peptide (BNP) Testing
- A56451Billing and Coding: Cardiac Computed Tomography (CCT) and Coronary Computed Tomography Angiography (CCTA)
Alphabetic index entries that lead here
- Angina›unstable
- Impending›coronary syndrome
- Impending›myocardial infarction
- Infarct, infarction›impending(myocardium)
- Syndrome›impending coronary
- Syndrome›intermediate coronary(artery)
- Syndrome›preinfarction
- Syndrome›coronary›insufficiency or intermediate
Code history
Unchanged in every release from FY2024 to FY2027.