I20.81 – Angina pectoris with coronary microvascular dysfunction

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

Billable code

ICD-10-CM code I20.81

Code: I20.81 (claims format: I2081)
Description: Angina pectoris with coronary microvascular dysfunction
Billable: Yes – valid for HIPAA-covered transactions
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
Parent codes: I20 › I20.8

Notes for I20.81

Applicable to:

Angina pectoris with coronary microvascular disease

Notes inherited from parent codes

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

I20 – Angina pectoris

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)

I20.8 – Other forms of angina pectoris

Use additional code:

code(s) for symptoms associated with angina equivalent

Block I20-I25

Code also:

the presence of hypertension (I10-I1A)

Index terms for I20.81

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in I20.8

I20.89 – Other forms of angina pectorisBillable

Frequently asked questions

What is ICD-10 code I20.81?

I20.81 is the ICD-10-CM code for angina pectoris with coronary microvascular dysfunction, in the block I20-I25 (Ischemic heart diseases).

Is I20.81 a billable code?

Yes. I20.81 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does I20.81 belong to?

It belongs to category I20 – Angina pectoris.

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.