ICD-10 F43.9
ICD-10 F43.9: Reaction to severe stress, unspecified
Category
Trauma and stress
Code Type
Mental health diagnosis
Using ICD-10 F43.9 on a Superbill
ICD-10 code F43.9 (Reaction to severe stress, unspecified) is a trauma and stress code used on superbills for mental health therapy billing. Insurance companies require at least one ICD-10 code per superbill to process a reimbursement claim.
CPT Codes Commonly Used With F43.9
Common CPT codes paired with ICD-10 F43.9 include 90837 (60-min psychotherapy), 90834 (45-min psychotherapy), and 90791 (initial psychiatric evaluation). The CPT code reflects the service rendered, not the diagnosis.