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ICD-10-CM 2027 diagnosis code

I25.41Coronary artery aneurysm

✓ Billable / specific

I25.41 is a valid, billable ICD-10-CM code for coronary artery aneurysm. 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 Coronary aneurysm.

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 I25.41

I25.41 is the ICD-10-CM diagnosis code for coronary artery aneurysm. 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 I25.4 (coronary artery aneurysm and dissection), I25.41 is specifically for coronary artery aneurysm. Related codes cover dissection (I25.42).

Don't report I25.41 together with the conditions in its Excludes1 note: congenital coronary (artery) aneurysm (Q24.5).

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 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), 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 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 414.11 (aneurysm of coronary vessels).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Coronary arteriovenous fistula, acquired
Excludes1Not coded here — never report together with this code
  • congenital coronary (artery) aneurysm (Q24.5)

Notes that apply from higher levels

Instructions written at a parent level also apply to I25.41.

› 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

4 entries

Terms in the official ICD-10-CM index that lead to I25.41.

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.

ICD-9-CM equivalent

Converter →
  • 414.11Aneurysm of coronary vesselsexact

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 I25.41

Is I25.41 billable?

Yes. I25.41 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I25.41 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I25.41 as a principal diagnosis.

Is I25.41 a CC or MCC?

No. I25.41 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I25.41 group to?

I25.41 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) and MS-DRG 316 (Other Circulatory System Diagnoses without CC/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 I25.41?

The CMS General Equivalence Mappings map I25.41 to ICD-9-CM 414.11.