ICD-10 · PDGM grouping
Q98 Other sex chromosome abnormalities, male phenotype, not elsewhere classified
All 9 codes in the Q98 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
9
Can lead a claim
9
Cannot lead a claim
0
What CMS assigns to Q98
All 9 codes group to MMTA - Other. None of the 9 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in Q98
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 |
|---|---|---|---|---|
| Q98.0 | Klinefelter syndrome karyotype 47, XXY | Can lead a claim | A | None |
| Q98.1 | Klinefelter syndrome, male with more than two X chromosomes | Can lead a claim | A | None |
| Q98.3 | Other male with 46, XX karyotype | Can lead a claim | A | None |
| Q98.4 | Klinefelter syndrome, unspecified | Can lead a claim | A | None |
| Q98.5 | Karyotype 47, XYY | Can lead a claim | A | None |
| Q98.6 | Male with structurally abnormal sex chromosome | Can lead a claim | A | None |
| Q98.7 | Male with sex chromosome mosaicism | Can lead a claim | A | None |
| Q98.8 | Other specified sex chromosome abnormalities, male phenotype | Can lead a claim | A | None |
| Q98.9 | Sex chromosome abnormality, male phenotype, unspecified | 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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