F51.01 Primary insomnia
ICD-10-CM · CMS code reference
F51.01 covers primary insomnia, including insomnia the provider documents as idiopathic. Insomnia linked to another mental disorder has its own code, F51.05.
Coding notes
From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.
Also covers
- Idiopathic insomnia
Excludes2
Not part of this code, but both can be coded when both are documented.
- alcohol related insomnia (F10.182, F10.282, F10.982)
- drug-related insomnia (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)
- insomnia NOS (G47.0-)
- insomnia due to known physiological condition (G47.0-)
- organic insomnia (G47.0-)
- sleep deprivation (Z72.820)
- organic sleep disorders (G47.-)
Related codes
F51.02Adjustment insomnia ICD-10-CMF51.03Paradoxical insomnia ICD-10-CMF51.04Psychophysiologic insomnia ICD-10-CMF51.05Insomnia due to other mental disorder ICD-10-CMF51.09Other insomnia not due to a substance or known physiological condition ICD-10-CMF51.11Primary hypersomnia ICD-10-CMF51.12Insufficient sleep syndrome ICD-10-CMF51.13Hypersomnia due to other mental disorder ICD-10-CM
Common questions
Is F51.01 a billable code?
Yes. F51.01 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.