I20 ICD-10-CM Code: Angina pectoris
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the circulatory system (I00-I99) / Ischemic heart diseases (I20-I25)
I20
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceAngina pectoris
Angina pectoris
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for I20 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for I20 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for I20 in this effective period.
Excludes 1
Official- angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-)
- atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-)
- postinfarction angina (I23.7)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for I20 in this effective period.
Use Additional
Official- code to identify:
- exposure to environmental tobacco smoke (Z77.22)
- history of tobacco dependence (Z87.891)
- occupational exposure to environmental tobacco smoke (Z57.31)
- tobacco dependence (F17.-)
Code Also
OfficialICD-10-CM does not list Code Also instructions for I20 in this effective period.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- I20
- Description
- Angina pectoris
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
I20 is the ICD-10-CM diagnosis code for angina pectoris. I20 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering ischemic heart diseases (i20-i25).
Header codes like I20 cannot be reported on claims directly, they organize child codes that share clinical context but the actual diagnosis must be coded to the highest level of specificity supported by the documentation. Coders should look at I20's child codes and select the one that matches the patient's documented presentation, since payers reject header codes submitted as the primary diagnosis. For risk adjustment workflows, header codes never contribute to a Medicare Advantage member's RAF score on their own; only billable child codes that happen to map to a payment HCC affect risk-adjusted plan payments.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for I20 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.