ICD-10 · PDGM grouping
N61 Inflammatory disorders of breast
All 6 codes in the N61 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
6
Can lead a claim
5
Cannot lead a claim
1
What CMS assigns to N61
5 of the 6 codes group to MMTA - Other (3), Wound (1) and MMTA - Gastrointestinal tract and Genitourinary system (1); 1 is assigned no clinical group. None of the 6 is assigned a comorbidity subgroup. 5 of the 6 can lead a claim.
Every code in N61
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 |
|---|---|---|---|---|
| N61.0 | Mastitis without abscess | Can lead a claim | J | None |
| N61.1 | Abscess of the breast and nipple | Can lead a claim | C | None |
| N61.2 Granulomatous mastitis | ||||
| N61.20 | Granulomatous mastitis, unspecified breast | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| N61.21 | Granulomatous mastitis, right breast | Can lead a claim | A | None |
| N61.22 | Granulomatous mastitis, left breast | Can lead a claim | A | None |
| N61.23 | Granulomatous mastitis, bilateral breast | Can lead a claim | A | 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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