ICD-10 · PDGM grouping
Z55 Problems related to education and literacy
All 9 codes in the Z55 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
0
Cannot lead a claim
9
What CMS assigns to Z55
None of the 9 codes is assigned a clinical group. None of the 9 is assigned a comorbidity subgroup. None can lead a claim.
Every code in Z55
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 |
|---|---|---|---|---|
| Z55.0 | Illiteracy and low-level literacy | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.1 | Schooling unavailable and unattainable | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.2 | Failed school examinations | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.3 | Underachievement in school | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.4 | Educational maladjustment and discord with teachers and classmatesCMS: Educational maladjustment & discord w teachers & classmates | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.5 | Less than a high school diploma | Cannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosis | None | None |
| Z55.6 | Problems related to health literacy | Cannot lead a claimUnacceptable principal diagnosis, code is not reportable as principal diagnosis | None | None |
| Z55.8 | Other problems related to education and literacy | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z55.9 | Problems related to education and literacy, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | 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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