F51.1
Header — not billableHypersomnia not due to a substance or known physiological condition
The ICD-10 code for hypersomnia not due to a substance or known physiological condition is F51.1.
F51.1 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 4 more specific codes below.
Clinical notes
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
- alcohol related hypersomnia (F10.182, F10.282, F10.982)
- drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
- hypersomnia NOS (G47.10)
- hypersomnia due to known physiological condition (G47.10)
- idiopathic hypersomnia (G47.11, G47.12)
- narcolepsy (G47.4-)
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- F51.0Insomnia not due to a substance or known physiological conditionnon-billable 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
- F51.1Hypersomnia not due to a substance or known physiological conditionnon-billable header