F99
BillableMental disorder, not otherwise specified
F99 is the ICD-10-CM code for Mental disorder, not otherwise specified. It is a billable, specific code valid for reimbursement.
- Status
- Billable
- Chapter
- F01-F99
- Edition
- FY2026
F01-F99 Mental, Behavioral and Neurodevelopmental disorders
Includes
- •Mental illness NOS
Excludes1 — not coded here
- •unspecified mental disorder due to known physiological condition (F09)
Frequently asked questions
- What is ICD-10 code F99?
- F99 is the ICD-10-CM code for "Mental disorder, not otherwise specified". It falls under F01-F99 Mental, Behavioral and Neurodevelopmental disorders.
- Is F99 a billable code?
- Yes — F99 is a billable, specific ICD-10-CM code valid for reimbursement.
- What is excluded from F99?
- Excludes1 (not coded here): unspecified mental disorder due to known physiological condition (F09).
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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