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ICD-10-CM 2027 diagnosis code

F40Phobic anxiety disorders

Not billable — use a more specific code

F40 is a header code, so it can't be reported by itself. Choose one of the 5 more specific codes beneath it.

Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS, effective October 1, 2026. Updated September 29, 2026. About our data

About F40

F40 is the ICD-10-CM diagnosis code for phobic anxiety disorders. It belongs to block F40-F48 (anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: F40.0 (agoraphobia), F40.1 (phobias), F40.2 (phobias), F40.8 (disorders) and F40.9 (unspecified).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under F40

Notes that apply from higher levels

Instructions written at a parent level also apply to F40.

Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Codes whose notes reference F40

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F40

Is F40 billable?

No. F40 is a header code. Report one of its more specific subcodes instead.