Skip to content
Dx

ICD-10-CM 2027 diagnosis code

I51.2Rupture of papillary muscle, not elsewhere classified

✓ Billable / specificMCC — major complication/comorbidity

I51.2 is a valid, billable ICD-10-CM code for rupture of papillary muscle, not elsewhere classified. 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 I51.2

I51.2 is the ICD-10-CM diagnosis code for rupture of papillary muscle, not elsewhere classified. It belongs to category I51 (complications and ill-defined descriptions of heart disease), 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 I51 (complications and ill-defined descriptions of heart disease), I51.2 is specifically for rupture of papillary muscle, not elsewhere classified. Related codes cover cardiac septal defect, acquired (I51.0), rupture of chordae tendineae, not elsewhere classified (I51.1), intracardiac thrombosis, not elsewhere classified (I51.3), myocarditis, unspecified (I51.4), myocardial degeneration (I51.5), Cardiomegaly (I51.7), other ill-defined heart diseases (I51.8) and heart disease, unspecified (I51.9).

Don't report I51.2 together with the conditions in its Excludes1 note: rupture of papillary muscle as current complication following acute myocardial infarction (I23.5).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" 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 306 (Cardiac Congenital and Valvular Disorders with MCC, relative weight 1.546) and DRG 307 (Cardiac Congenital and Valvular Disorders without MCC, relative weight 0.9148), 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 429.6 (rupture of papillary muscle).

Coding notes

Excludes1Not coded here — never report together with this code
  • rupture of papillary muscle as current complication following acute myocardial infarction (I23.5)

Notes that apply from higher levels

Instructions written at a parent level also apply to I51.2.

› From I51 Complications and ill-defined descriptions of heart disease
Excludes2
  • heart disease specified as rheumatic (I00-I09)

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 I51.2.

Codes whose notes reference I51.2

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.

ICD-9-CM equivalent

Converter →
  • 429.6Rupture of papillary muscleapproximate

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 I51.2

Is I51.2 billable?

Yes. I51.2 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I51.2 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I51.2 as a principal diagnosis.

Is I51.2 a CC or MCC?

I51.2 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does I51.2 group to?

I51.2 is used in the MS-DRG v44.0 logic for MS-DRG 306 (Cardiac Congenital and Valvular Disorders with MCC) and MS-DRG 307 (Cardiac Congenital and Valvular Disorders 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 I51.2?

The CMS General Equivalence Mappings map I51.2 to ICD-9-CM 429.6.