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ICD-10-CM 2027 diagnosis code

I42.09Other dilated cardiomyopathy

✓ Billable / specificNew for 2027CC — complication/comorbidity

I42.09 is a valid, billable ICD-10-CM code for other dilated cardiomyopathy. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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

About I42.09

I42.09 is the ICD-10-CM diagnosis code for other dilated cardiomyopathy. It belongs to category I42 (cardiomyopathy), block I30-I5A (other forms of heart disease) 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 I42.0, choose I42.09 (Other dilated cardiomyopathy) only when documentation doesn't support a more specific option: unspecified (I42.00) and Familial-genetic dilated cardiomyopathy (I42.01).

Code first: pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4).

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) 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 was added in FY2027, effective October 1, 2026.

Coding notes

Applicable toConditions and synonyms classified to this code
  • Other nonfamilial dilated cardiomyopathy

Notes that apply from higher levels

Instructions written at a parent level also apply to I42.09.

› From I42 Cardiomyopathy
Includes
  • myocardiopathy
Excludes2
  • ischemic cardiomyopathy (I25.5)
  • peripartum cardiomyopathy (O90.3)
  • ventricular hypertrophy (I51.7)
Code first
  • pre-existing cardiomyopathy complicating pregnancy and puerperium (O99.4)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to I42.09.

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.

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
  • FY2027 (effective 10/1/2026): Added

Common questions about I42.09

Is I42.09 billable?

Yes. I42.09 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I42.09 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I42.09 as a principal diagnosis.

Is I42.09 a CC or MCC?

I42.09 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I42.09 group to?

I42.09 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.

Did I42.09 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.