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ICD-10-CM 2027 diagnosis code

I25.3Aneurysm of heart

✓ Billable / specificCC — complication/comorbidity

I25.3 is a valid, billable ICD-10-CM code for aneurysm of heart. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 I25.3

I25.3 is the ICD-10-CM diagnosis code for aneurysm of heart. 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), I25.3 is specifically for aneurysm of heart. Related codes cover Atherosclerotic heart disease of native coronary artery (I25.1), old myocardial infarction (I25.2), 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.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508), DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 05 (Diseases and Disorders of the Circulatory System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 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 414.10 (aneurysm of heart (wall)) and 414.19 (other aneurysm of heart).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Mural aneurysm
  • Ventricular aneurysm

Notes that apply from higher levels

Instructions written at a parent level also apply to I25.3.

› 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

2 entries

Terms in the official ICD-10-CM index that lead to I25.3.

Codes whose notes reference I25.3

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 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 414.10Aneurysm of heart (wall)approximate
  • 414.19Other aneurysm of heartapproximate

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 I25.3

Is I25.3 billable?

Yes. I25.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I25.3 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I25.3 as a principal diagnosis.

Is I25.3 a CC or MCC?

I25.3 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I25.3 group to?

I25.3 is used in the MS-DRG v44.0 logic for MS-DRG 314 (Other Circulatory System Diagnoses with MCC), MS-DRG 315 (Other Circulatory System Diagnoses with CC), MS-DRG 316 (Other Circulatory System Diagnoses without CC/MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). 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 I25.3?

The CMS General Equivalence Mappings map I25.3 to ICD-9-CM 414.10 and 414.19.