F51.5 vs G47.59
F51.5 (Nightmare disorder) compared with G47.59 (Other parasomnia), 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. F51.5 carries an Excludes2 note covering G47.59: “organic sleep disorders (G47.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. G47.59 carries an Excludes2 note covering F51.5: “nightmares (F51.5)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. G47.59 carries an Excludes2 note covering F51.5: “nonorganic sleep disorders (F51.-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F51.5Nightmare disorder | G47.59Other parasomnia | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Nightmare disorder is a billable ICD-10-CM diagnosis code (F51.5). | Other parasomnia is a billable ICD-10-CM diagnosis code (G47.59). |
| Includes | Dream anxiety disorder | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources