F51.0 vs Z72.821
F51.0 (Insomnia not due to a substance or known physiological condition) compared with Z72.821 (Inadequate sleep hygiene), 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?
No — do not report together. Z72.821 carries an Excludes1 note covering F51.0: “insomnia (F51.0-, G47.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| F51.0Insomnia not due to a substance or known physiological condition | Z72.821Inadequate sleep hygiene | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Insomnia not due to a substance or known physiological condition is a non-billable ICD-10-CM category code (F51.0). | Inadequate sleep hygiene is a billable ICD-10-CM diagnosis code (Z72.821). |
| Includes | — | Bad sleep habits Irregular sleep habits Unhealthy sleep wake schedule |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources