F99 ICD-10-CA code: Mental disorder, not otherwise specified
F99 is the ICD-10-CA code for “Mental disorder, not otherwise specified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
F99Mental disorder, not otherwise specified
Short description: Mental disorder not otherwise specified
ICD-10-CA · Canada
Index terms
Entries in CIHI’s alphabetical index that lead to F99. Searching the index by the condition the note names is how coders reach this code.
- Mental, upset
- Insanity, insane
- Mental, disorder
- Aberration, mental
- Disturbance, mental
- Reaction, psychogenic
- Disease, diseased, mental
- Change(s) (of), mental NEC
- Disorder (of), psychological
- Disease, diseased, psychiatric
- Psychiatric disorder or problem NEC
- Problem (related to) (with), psychiatric
- Disorder (of), mental (or behavioral) (nonpsychotic)
Notes for F99
As CIHI prints them, with any note F99 takes from the headings above it.
Includes
- Mental illness NOS
- Disorders of psychological developmentFrom Chapter 5: Mental and behavioural disorders (F00-F99)
Excludes
Conditions classified elsewhere.
- Organic mental disorder NOS (F06.9)
- Symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)From Chapter 5: Mental and behavioural disorders (F00-F99)
Where F99 sits
- 1ChapterChapter 5: Mental and behavioural disorders (F00-F99)
- 2Block F99-F99Unspecified mental disorder (F99)
- 3Valid code F99Mental disorder, not otherwise specified
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code F99 mean?
F99 is the ICD-10-CA code for “Mental disorder, not otherwise specified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is F99 in ICD-10-CA?
F99 sits under F99-F99 Unspecified mental disorder (F99), within Chapter 5: Mental and behavioural disorders (F00-F99).
What coding notes apply to F99?
ICD-10-CA lists Includes, Excludes notes for F99, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.