F51: Sleep disorders not due to a substance or known physiological condition
Codes under F51 (Sleep disorders not due to a substance or known physiological condition). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| F51.0 | Insomnia not due to a substance or known physiological condition | — |
| F51.0 | Insomnia not due to a substance or known physiological condition | — |
| F51.01 | Primary insomnia | ✓ |
| F51.01 | Primary insomnia | ✓ |
| F51.1 | Hypersomnia not due to a substance or known physiological condition | — |
| F51.1 | Hypersomnia not due to a substance or known physiological condition | — |
| F51.02 | Adjustment insomnia | ✓ |
| F51.02 | Adjustment insomnia | ✓ |
| F51.03 | Paradoxical insomnia | ✓ |
| F51.03 | Paradoxical insomnia | ✓ |
| F51.3 | Sleepwalking [somnambulism] | ✓ |
| F51.3 | Sleepwalking [somnambulism] | ✓ |
| F51.04 | Psychophysiologic insomnia | ✓ |
| F51.04 | Psychophysiologic insomnia | ✓ |
| F51.4 | Sleep terrors [night terrors] | ✓ |
| F51.4 | Sleep terrors [night terrors] | ✓ |
| F51.05 | Insomnia due to other mental disorder | ✓ |
| F51.05 | Insomnia due to other mental disorder | ✓ |
| F51.5 | Nightmare disorder | ✓ |
| F51.5 | Nightmare disorder | ✓ |
| F51.8 | Other sleep disorders not due to a substance or known physiological condition | ✓ |
| F51.8 | Other sleep disorders not due to a substance or known physiological condition | ✓ |
| F51.09 | Other insomnia not due to a substance or known physiological condition | ✓ |
| F51.09 | Other insomnia not due to a substance or known physiological condition | ✓ |
| F51.9 | Sleep disorder not due to a substance or known physiological condition, unspecified | ✓ |
| F51.9 | Sleep disorder not due to a substance or known physiological condition, unspecified | ✓ |
| F51.11 | Primary hypersomnia | ✓ |
| F51.11 | Primary hypersomnia | ✓ |
| F51.12 | Insufficient sleep syndrome | ✓ |
| F51.12 | Insufficient sleep syndrome | ✓ |
| F51.13 | Hypersomnia due to other mental disorder | ✓ |
| F51.13 | Hypersomnia due to other mental disorder | ✓ |
| F51.19 | Other hypersomnia not due to a substance or known physiological condition | ✓ |
| F51.19 | Other hypersomnia not due to a substance or known physiological condition | ✓ |
Frequently asked questions
What is ICD-10-CM code F51?
F51 is an ICD-10-CM category covering Sleep disorders not due to a substance or known physiological condition. It contains 34 more specific diagnosis codes, 30 of which are billable.
Is F51 a billable code?
No — F51 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example F51.0 — Insomnia not due to a substance or known physiological condition). 30 of the 34 codes under F51 are billable.
What codes fall under F51?
F51 includes F51.0, F51.0, F51.01, F51.01, F51.1, plus 29 more. See the full list with descriptions and billable status above.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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