Official ICD-10-CM description: Mental disorder, not otherwise specified
Common questions
Is F99 a billable code?
Yes. F99 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.
Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. About BillingBrief and our sources.
