F51Sleep disorders not due to a substance or known physiological condition

F51 is the ICD-10-CM diagnosis code for sleep disorders not due to a substance or known physiological condition. It belongs to block F50-F59 (behavioral syndromes associated with physiological disturbances and physical factors) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F51.0 (condition), F51.1 (condition), F51.3 ([somnambulism]), F51.4 (terrors]), F51.5 (disorder), F51.8 (condition) and F51.9 (unspecified).

The conditions in its Excludes2 note aren't part of F51, but may be coded alongside it if the patient has both: organic sleep disorders (G47.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.