Mental and behavioural disorders (F01–F99) ICD-10-CM
Chapter 5 of the ICD-10-CM classification spans codes F01–F99 and contains 1,112 diagnosis codes for mental and behavioural disorders, of which 871 are billable. The chapter is organized into 11 sections listed below, each linking to its code ranges and individual codes.
Chapter Coding Notes
Includes: disorders of psychological development
Excludes2: symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Sections in This Chapter 11 ranges · 1,112 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About Chapter 5
Chapter 5 of the ICD-10-CM, coded from F01 to F99, includes diagnoses related to a wide range of mental and behavioral disorders. These codes are used to identify conditions that affect mood, thinking, behavior, and emotional well-being.
This chapter covers disorders such as depression, anxiety, schizophrenia, bipolar disorder, and substance abuse, as well as developmental and neurocognitive disorders. It helps healthcare providers document and track mental health conditions, guiding treatment and support strategies. The codes also include behavioral issues linked to various psychological conditions and some organic brain syndromes caused by physical or chemical changes in the brain. Understanding and accurately applying these codes supports clear communication among medical professionals and helps improve patient care in mental health services.
Questions About This Page
How many codes are in the F01-F99 range?
The F01-F99 range contains 1,112 ICD-10-CM diagnosis codes in FY 2026. 871 of them are billable, and the rest are category headers that organize the chapter.
What conditions does F01-F99 cover?
The range covers mental and behavioural disorders. The sections listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
