F51 vs G47.52
F51 (Sleep disorders not due to a substance or known physiological condition) compared with G47.52 (REM sleep behavior disorder), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. F51 carries an Excludes2 note covering G47.52: “organic sleep disorders (G47.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. G47.52 carries an Excludes2 note covering F51: “nonorganic sleep disorders (F51.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F51Sleep disorders not due to a substance or known physiological condition | G47.52REM sleep behavior disorder | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Sleep disorders not due to a substance or known physiological condition is a non-billable ICD-10-CM category code (F51). | REM sleep behavior disorder is a billable ICD-10-CM diagnosis code (G47.52). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources