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ICD-10-CM 2027 diagnosis code

I25.2Old myocardial infarction

✓ Billable / specificPOA exempt

I25.2 is a valid, billable ICD-10-CM code for old myocardial infarction. 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 Old myocardial infarction.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I25.2

I25.2 is the ICD-10-CM diagnosis code for old myocardial infarction. It belongs to category I25 (chronic ischemic heart disease), 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 I25 (chronic ischemic heart disease), I25.2 is specifically for old myocardial infarction. Related codes cover Atherosclerotic heart disease of native coronary artery (I25.1), aneurysm of heart (I25.3), coronary artery aneurysm and dissection (I25.4), ischemic cardiomyopathy (I25.5), Silent myocardial ischemia (I25.6), atherosclerosis of coronary artery bypass graft(s) and coronary artery of transplanted heart with angina pectoris (I25.7), other forms of chronic ischemic heart disease (I25.8) and unspecified (I25.9).

Use an additional code to identify: chronic total occlusion of coronary artery (I25.82), 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 1 more.

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 302 (Atherosclerosis with MCC, relative weight 1.1984) and DRG 303 (Atherosclerosis without MCC, relative weight 0.6612), 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 is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 412 (old myocardial infarction).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Healed myocardial infarction
  • Past myocardial infarction diagnosed by ECG or other investigation, but currently presenting no symptoms

Notes that apply from higher levels

Instructions written at a parent level also apply to I25.2.

› From I25 Chronic ischemic heart disease
Excludes2
  • non-ischemic myocardial injury (I5A)
Use additional code
  • code to identify:
  • chronic total occlusion of coronary artery (I25.82)
  • 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

8 entries

Terms in the official ICD-10-CM index that lead to I25.2.

Codes whose notes reference I25.2

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

ICD-9-CM equivalent

Converter →
  • 412Old myocardial infarctionexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

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
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about I25.2

Is I25.2 billable?

Yes. I25.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I25.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I25.2 as a principal diagnosis.

Is I25.2 a CC or MCC?

No. I25.2 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I25.2 group to?

I25.2 is used in the MS-DRG v44.0 logic for MS-DRG 302 (Atherosclerosis with MCC) and MS-DRG 303 (Atherosclerosis without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for I25.2?

The CMS General Equivalence Mappings map I25.2 to ICD-9-CM 412.