F51 — Sleep disorders not due to a substance or known physiological condition
Is F51 billable?
No — F51 is a non-billable header code. F51 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 15 billable codes beneath F51.
Billable codes under this header
- F51.3Sleepwalking [somnambulism]
- F51.4Sleep terrors [night terrors]
- F51.5Nightmare disorder
- F51.8Other sleep disorders not due to a substance or known physiological condition
- F51.9Sleep disorder not due to a substance or known physiological condition, unspecified
- F51.01Primary insomnia
- F51.02Adjustment insomnia
- F51.03Paradoxical insomnia
- F51.04Psychophysiologic insomnia
- F51.05Insomnia due to other mental disorder
- F51.09Other insomnia not due to a substance or known physiological condition
- F51.11Primary hypersomnia
- F51.12Insufficient sleep syndrome
- F51.13Hypersomnia due to other mental disorder
- F51.19Other hypersomnia not due to a substance or known physiological condition
F51 at a glance
| Code | F51 |
|---|---|
| Description | Sleep disorders not due to a substance or known physiological condition |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of F51, but a patient may have both at the same time. When documentation supports it, F51 and the excluded code may both be reported.
- organic sleep disorders (G47.-)
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F51, but a patient may have both at the same time. When documentation supports it, F51 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
What codes fall under F51? (7)
- F51.0Insomnia not due to a substance or known physiological conditionnot billable
- F51.1Hypersomnia not due to a substance or known physiological conditionnot billable
- F51.3Sleepwalking [somnambulism]
- F51.4Sleep terrors [night terrors]
- F51.5Nightmare disorder
- F51.8Other sleep disorders not due to a substance or known physiological condition
- F51.9Sleep disorder not due to a substance or known physiological condition, unspecified
How long has F51 existed?
F51 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.