F40.240 Claustrophobia

Billable ICD-10-CM code, FY2026.

Applies from F40.2 Specific (isolated) phobias

Excludes2 (not included here)

• dysmorphophobia (nondelusional) (F45.22)
• nosophobia (F45.22)

Risk adjustment (HCC)

• RxHCC V08: HCC 133 — Anxiety and Other Psychiatric Disorders

MS-DRG index

Defines the logic of DRG(s) 882 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 300.29 Other isolated or specific phobias (approximate)

Code annotations containing back-references to F40.240

Back-references to F40

• Type 2 Excludes: F06.4 Anxiety disorder due to known physiological condition ("anxiety disorders, not due to known physiological condition or unspecified (F40.-, F41.-)")
• Type 2 Excludes: F90 Attention-deficit hyperactivity disorders ("anxiety disorders (F40.-, F41.-)")
• Type 2 Excludes: F93.0 Separation anxiety disorder of childhood ("nonpsychotic mental disorders (F40-F48)")

Diagnosis Index entries for F40.240

• Claustrophobia
• Phobia, phobic › specific (isolated) › situational › closed in spaces

Nearby codes

• F40.230 Fear of blood
• F40.231 Fear of injections and transfusions
• F40.232 Fear of other medical care
• F40.233 Fear of injury
• F40.24 Situational type phobia
• F40.240 Claustrophobia (this code)
• F40.241 Acrophobia
• F40.242 Fear of bridges
• F40.243 Fear of flying
• F40.248 Other situational type phobia
• F40.29 Other specified phobia