ICD-10-CM 2027
ICD-10 code for Claustrophobia
From the official ICD-10-CM alphabetic index entry “Claustrophobia”. Page updated September 29, 2026.
About coding Claustrophobia
The ICD-10-CM code for Claustrophobia is F40.240 (Claustrophobia).
Within F40.24 (situational type phobia), F40.240 is specifically for Claustrophobia. Related codes cover Acrophobia (F40.241), fear of bridges (F40.242), fear of flying (F40.243) and other situational type phobia (F40.248).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 882 (Neuroses Except Depressive, relative weight 0.9952), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about Claustrophobia ICD-10 codes
What is the ICD-10 code for Claustrophobia?
- F40.240 — Claustrophobia.
Is F40.240 billable?
- Yes. F40.240 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F40.240 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F40.240 as a principal diagnosis.
Is F40.240 a CC or MCC?
- No. F40.240 is neither a CC nor an MCC under MS-DRG v44.0.