F99

Mental disorder, not otherwise specified

Billable FY2026 2025-10-01 → 2026-09-30

Exclusions 2 never code together

F99code

Excludes1

unspecified mental disorder due to known physiological condition (F09)F09 F09 F09

Excludes2

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)R00-R99

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 2

F99code

Inclusion terms

Includes

Index entries leading here 8

Aberration
- mental F99
Disease, diseased — see also Syndrome
- mental F99
- psychiatric F99
Disorder (of) — see also Disease
- mental (or behavioral) (nonpsychotic) F99
- psychological F99
Disturbance (s) — see also Disease
- mental F99
Problem (with) (related to)
- psychiatric F99
Psychiatric disorder or problem F99
Reaction — see also Disorder
- psychogenic F99
Situation, psychiatric F99

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

Present FY2024–FY2027.