Current
F99 — Mental disorder, not otherwise specified
Part of Chapter 5: Mental, Behavioral and Neurodevelopmental disorders , block Unspecified mental disorder (F99) .
Official Notes
Inclusion Terms
Mental illness NOS
Excludes1
unspecified mental disorder due to known physiological condition ( F09 )
Child Codes
F99 has no child codes in the FY 2027 release -- it is used on its own.
Referenced By
Official notes on these codes cite F99.
FY 2027 effective October 1, 2026 · CDC NCHS and CMS