ICD-10 F09: Unspecified mental disorder due to known physiological condition
Using ICD-10 F09 on a Superbill
ICD-10 code F09 (Unspecified mental disorder due to known physiological condition) is a organic mental disorders 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 F09
Common CPT codes paired with ICD-10 F09 include 90837 (60-min psychotherapy), 90834 (45-min psychotherapy), and 90791 (initial psychiatric evaluation). The CPT code reflects the service rendered, not the diagnosis.
Clinical Criteria
Mental disorder directly attributable to a known physiological condition that causes clinically significant distress or impairment, where the specific type cannot be determined from available information. Used when the mental disorder is clearly organic but does not fit other named categories.
DSM-5 Cross-Reference
DSM-5 — Unspecified Mental Disorder Due to Another Medical Condition