ICD-10 · PDGM grouping
F51 Sleep disorders not due to a substance or known physiological condition
All 15 codes in the F51 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
15
Can lead a claim
15
Cannot lead a claim
0
What CMS assigns to F51
All 15 codes group to Behavioral Health. None of the 15 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in F51
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 |
|---|---|---|---|---|
| F51.0 Insomnia not due to a substance or known physiological condition | ||||
| F51.01 | Primary insomnia | Can lead a claim | F | None |
| F51.02 | Adjustment insomnia | Can lead a claim | F | None |
| F51.03 | Paradoxical insomnia | Can lead a claim | F | None |
| F51.04 | Psychophysiologic insomnia | Can lead a claim | F | None |
| F51.05 | Insomnia due to other mental disorder | Can lead a claim | F | None |
| F51.09 | Other insomnia not due to a substance or known physiological conditionCMS: Oth insomnia not due to a substance or known physiol cond | Can lead a claim | F | None |
| F51.1 Hypersomnia not due to a substance or known physiological condition | ||||
| F51.11 | Primary hypersomnia | Can lead a claim | F | None |
| F51.12 | Insufficient sleep syndrome | Can lead a claim | F | None |
| F51.13 | Hypersomnia due to other mental disorder | Can lead a claim | F | None |
| F51.19 | Other hypersomnia not due to a substance or known physiological conditionCMS: Oth hypersomnia not due to a substance or known physiol cond | Can lead a claim | F | None |
| F51.3 | Sleepwalking [somnambulism] | Can lead a claim | F | None |
| F51.4 | Sleep terrors [night terrors] | Can lead a claim | F | None |
| F51.5 | Nightmare disorder | Can lead a claim | F | None |
| F51.8 | Other sleep disorders not due to a substance or known physiological conditionCMS: Oth sleep disord not due to a sub or known physiol cond | Can lead a claim | F | None |
| F51.9 | Sleep disorder not due to a substance or known physiological condition, unspecifiedCMS: Sleep disorder not due to a sub or known physiol cond, unsp | Can lead a claim | F | 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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