F51.5 Nightmare disorder
ICD-10-CM · CMS code reference
F51.5 covers nightmare disorder, including records that call it dream anxiety disorder. Sleep terrors, also called night terrors, have their own code, F51.4.
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
- Dream anxiety disorder
Excludes2
Not part of this code, but both can be coded when both are documented.
- organic sleep disorders (G47.-)
Related codes
F51.11Primary hypersomnia ICD-10-CMF51.12Insufficient sleep syndrome ICD-10-CMF51.13Hypersomnia due to other mental disorder ICD-10-CMF51.19Other hypersomnia not due to a substance or known physiological condition ICD-10-CMF51.3Sleepwalking [somnambulism] ICD-10-CMF51.4Sleep terrors [night terrors] ICD-10-CMF51.8Other sleep disorders not due to a substance or known physiological condition ICD-10-CMF51.9Sleep disorder not due to a substance or known physiological condition, unspecified ICD-10-CM
Common questions
Is F51.5 a billable code?
Yes. F51.5 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.