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ICD-10-CM 2027 diagnosis code

I20.89Other forms of angina pectoris

✓ Billable / specific

I20.89 is a valid, billable ICD-10-CM code for other forms of angina pectoris. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Stenocardia, ICD-10 code for Likoff's syndrome, ICD-10 code for Schaufenster krankheit.

Code last changed in FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I20.89

I20.89 is the ICD-10-CM diagnosis code for other forms of angina pectoris. It belongs to category I20 (angina pectoris), block I20-I25 (ischemic heart diseases) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I20.8, choose I20.89 (Other forms of angina pectoris) only when documentation doesn't support a more specific option: angina pectoris with coronary microvascular dysfunction (I20.81).

Use an additional 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.-) and tobacco use (Z72.0).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 311 (Angina Pectoris, relative weight 0.6684), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It was added in FY2024, effective October 1, 2023.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Angina equivalent
  • Angina of effort
  • Coronary slow flow syndrome
  • Stable angina
  • Stenocardia

Notes that apply from higher levels

Instructions written at a parent level also apply to I20.89.

› From I20.8 Other forms of angina pectoris
Use additional code
  • code(s) for symptoms associated with angina equivalent
› From I20 Angina pectoris
Excludes1
  • 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)

Broader instructions also apply from I20-I25 Ischemic heart diseases and Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

12 entries

Terms in the official ICD-10-CM index that lead to I20.89.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 05 · Diseases and Disorders of the Circulatory System

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about I20.89

Is I20.89 billable?

Yes. I20.89 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I20.89 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I20.89 as a principal diagnosis.

Is I20.89 a CC or MCC?

No. I20.89 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I20.89 group to?

I20.89 is used in the MS-DRG v44.0 logic for MS-DRG 311 (Angina Pectoris). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.