ICD-10 · PDGM grouping
I51 Complications and ill-defined descriptions of heart disease
All 10 codes in the I51 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
10
Can lead a claim
10
Cannot lead a claim
0
What CMS assigns to I51
All 10 codes group to MMTA - Cardiac and Circulatory. 2 of the 10 count toward the Other Heart Diseases comorbidity subgroup; 8 are assigned none. Every code can lead a claim.
- Other Heart Diseases: counts toward the high comorbidity tier only in an interaction pair.
Every code in I51
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| I51.0 | Cardiac septal defect, acquired | Can lead a claim | H | None |
| I51.1 | Rupture of chordae tendineae, not elsewhere classified | Can lead a claim | H | None |
| I51.2 | Rupture of papillary muscle, not elsewhere classified | Can lead a claim | H | None |
| I51.3 | Intracardiac thrombosis, not elsewhere classified | Can lead a claim | H | Other Heart Diseases |
| I51.4 | Myocarditis, unspecified | Can lead a claim | H | None |
| I51.5 | Myocardial degeneration | Can lead a claim | H | None |
| I51.7 | Cardiomegaly | Can lead a claim | H | None |
| I51.8 Other ill-defined heart diseases | ||||
| I51.81 | Takotsubo syndrome | Can lead a claim | H | None |
| I51.89 | Other ill-defined heart diseases | Can lead a claim | H | Other Heart Diseases |
| I51.9 | Heart disease, unspecified | Can lead a claim | H | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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