All ICD10 Codes

I20

Non-Billable
ChapterI00–I99
Rankcategory
Official Description

Angina pectoris

Use a more specific code (4 billable, 1 non-billable)
I20.0Unstable anginaI20.1Angina pectoris with documented spasmI20.2Refractory angina pectorisI20.8Other forms of angina pectorishas subcodesI20.9Angina pectoris, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

I20-I25 Parent Instructions

Code Also
  • the presence of hypertension (I10-I1A)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • 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)
Use Additional Code
  • 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.-)
  • tobacco use (Z72.0)

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I20-I25Ischemic heart diseases (I20-I25)
I20Angina pectorisNot billable
I20.0Unstable anginaBillable
I20.1Angina pectoris with documented spasmBillable
I20.2Refractory angina pectorisBillable
I20.8Other forms of angina pectorisSubcodes
I20.9Angina pectoris, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I20:

blockI20-I25
Ischemic heart diseases (I20-I25)
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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