Angina pectoris (I20) ICD-10-CM
The I20 code range covers angina pectoris with 8 ICD-10-CM diagnosis codes. 6 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an 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
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the I20 Range 8 codes · 6 billable
- I20 Angina pectorisNon-billable
- I20.0 Unstable angina
- I20.1 Angina pectoris with documented spasm
- I20.2 Refractory angina pectoris
- I20.8 Other forms of angina pectorisNon-billable
- I20.81 Angina pectoris with coronary microvascular dysfunction
- I20.89 Other forms of angina pectoris
- I20.9 Angina pectoris, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I20 range.
Angina Pectoris
The symptom of paroxysmal pain consequent to MYOCARDIAL ISCHEMIA usually of distinctive character, location and radiation. It is thought to be provoked by a transient stressful situation during which the oxygen requirements of the MYOCARDIUM exceed that supplied by the CORONARY CIRCULATION.
Angina Pectoris, Variant
A clinical syndrome characterized by the development of CHEST PAIN at rest with concomitant transient ST segment elevation in the ELECTROCARDIOGRAM, but with preserved exercise capacity.
Angina, Unstable
Precordial pain at rest, which may precede a MYOCARDIAL INFARCTION.
About the I20 Code Range
Angina pectoris is pain that occurs when the heart muscle temporarily receives less oxygen than it needs. It belongs to the ischemic heart diseases group.
The subdivisions distinguish unstable angina (I20.0), angina with documented spasm (I20.1), and angina described as refractory (I20.2). Other forms fall under I20.8. Within that group, I20.81 identifies a problem with the heart's small blood vessels, while I20.89 remains other forms. I20.9 does not specify the form of angina.
Questions About This Page
How many billable codes are in the I20 range?
Of the 8 codes in this range, 6 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the I20 range classify?
The range classifies angina pectoris. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
