I20.81

Angina pectoris with coronary microvascular dysfunction

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 13 never code together

I20code

Excludes1

angina pectoris with atherosclerotic heart disease of native coronary arteries (I25.1-)I25.1-
atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7-)I25.7-
postinfarction angina (I23.7)I23.7

I00-I99chapter

Excludes2

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

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 9

I20.81code

Inclusion terms

Angina pectoris with coronary microvascular disease

I20code

Use additional code

code to identify:
exposure to environmental tobacco smoke (Z77.22)Z77.22
history of tobacco dependence (Z87.891)Z87.891
occupational exposure to environmental tobacco smoke (Z57.31)Z57.31
tobacco dependence (F17.-)F17.-
tobacco use (Z72.0)Z72.0

I20.8code

Use additional code

code(s) for symptoms associated with angina equivalent

I20-I25block

Code also

the presence of hypertension (I10-I1A)I10-I1A

Index entries leading here 3

Angina (attack) (cardiac) (chest) (heart) (pectoris) (syndrome) (vasomotor) I20.9
- with
  - coronary microvascular disease I20.81
  - coronary microvascular dysfunction I20.81
Disease, diseased — see also Syndrome
- coronary (artery) — see Disease, heart, ischemic, atherosclerotic
  - microvascular
    - with
      - angina pectoris I20.81
Dysfunction
- coronary microvascular I25.85
  - with
    - angina pectoris I20.81

Alongside this code 1 same parent — I20.8

I20.89 Other forms of angina pectoris

Medications 2

133 Angina Pectoris drugs 32 Angina Pectoris, Variant drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

CMS22HCC88 ESRD21HCC88 ESRD24HCC88 RX08HCC188

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: I20.8
Block: I20-I25
Siblings: 1

Present FY2024–FY2027.