I20.0
ICD-10BillableUnstable angina
Official ICD-10-CM descriptor (FY2026)
Unstable angina
I20.0 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Accelerated angina
- Crescendo angina
- De novo effort angina
- Intermediate coronary syndrome
- Preinfarction syndrome
- Worsening effort angina
Related codes in I20
Where this code sits
- Parent code
- I20
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.