F51.8 vs G47.5
F51.8 (Other sleep disorders not due to a substance or known physiological condition) compared with G47.5 (Parasomnia), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
Yes, when both are documented. F51.8 carries an Excludes2 note covering G47.5: “organic sleep disorders (G47.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
No — do not report together. G47.5 carries an Excludes1 note covering F51.8: “parasomnia not due to a substance or known physiological condition (F51.8)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Yes, when both are documented. G47.5 carries an Excludes2 note covering F51.8: “nonorganic sleep disorders (F51.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F51.8Other sleep disorders not due to a substance or known physiological condition | G47.5Parasomnia | |
|---|---|---|
| Billing status | Billable | Non-billable header |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Other sleep disorders not due to a substance or known physiological condition is a billable ICD-10-CM diagnosis code (F51.8). | Parasomnia is a non-billable ICD-10-CM category code (G47.5). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources