I20 – Angina pectoris

ICD-10-CM 2027 diagnosis code · Ischemic heart diseases

Non-billable header

ICD-10-CM code I20

Code: I20 (claims format: I20)
Description: Angina pectoris
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 9. Diseases of the circulatory system (I00-I99)
Block: I20-I25 Ischemic heart diseases

Billable codes under I20

I20 is a header code and cannot be used on claims. Choose the most specific code:

I20.0 – Unstable anginaBillable
I20.1 – Angina pectoris with documented spasmBillable
I20.2 – Refractory angina pectorisBillable
I20.8 – Other forms of angina pectorisHeader (more codes below)
I20.9 – Angina pectoris, unspecifiedBillable

Notes for I20

Excludes1 (not coded here):

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)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block I20-I25

Code also:

the presence of hypertension (I10-I1A)

Frequently asked questions

What is ICD-10 code I20?

I20 is the ICD-10-CM code for angina pectoris, in the block I20-I25 (Ischemic heart diseases).

Is I20 a billable code?

No. I20 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.