ICD-10 · PDGM grouping
A66 Yaws
All 10 codes in the A66 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 A66
All 10 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. None of the 10 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in A66
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 |
|---|---|---|---|---|
| A66.0 | Initial lesions of yaws | Can lead a claim | K | None |
| A66.1 | Multiple papillomata and wet crab yaws | Can lead a claim | K | None |
| A66.2 | Other early skin lesions of yaws | Can lead a claim | K | None |
| A66.3 | Hyperkeratosis of yaws | Can lead a claim | K | None |
| A66.4 | Gummata and ulcers of yaws | Can lead a claim | K | None |
| A66.5 | Gangosa | Can lead a claim | K | None |
| A66.6 | Bone and joint lesions of yaws | Can lead a claim | K | None |
| A66.7 | Other manifestations of yaws | Can lead a claim | K | None |
| A66.8 | Latent yaws | Can lead a claim | K | None |
| A66.9 | Yaws, unspecified | Can lead a claim | K | 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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