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F45.1 · Billable

2026 ICD-10-CM Diagnosis Code F45.1

Undifferentiated somatoform disorder

About F45.1

Code

F45.1

Description

Undifferentiated somatoform disorder

Billable

Yes — billable on its own

Parent code

F45 (Somatoform disorders)

Category

F40-F49 — Anxiety, dissociative, stress-related, somatoform and other nonpsychotic mental disorders

Set

ICD-10-CM 2026

Clinical context

Inherited from F45 (Somatoform disorders)

F45 codes somatoform disorders — conditions characterized by physical symptoms with no demonstrable medical cause or symptoms disproportionate to identified pathology. Includes somatization (F45.0), undifferentiated somatoform (F45.1), hypochondriasis (F45.21), body dysmorphic disorder (F45.22), and pain disorder linked to psychological factors (F45.41/F45.42). Document medical workup completed, symptom focus, and any associated anxiety or mood disorder.

Code details

Code attributes

  • Non-billable/Non-specific code

Coding rules

  • Specify the leaf code — the parent code (e.g. F32) is a navigational header; billing requires a leaf code (F32.0, F32.1, etc.) that matches the documented presentation.
  • Document onset, course, and severity (mild / moderate / severe) plus functional impact. Payers use this combination when adjudicating medical necessity.
  • Attach a validated instrument score (PHQ-9, GAD-7, PCL-5, or equivalent) at intake and at follow-up where applicable. Objective measures support code selection and continued authorization.
  • Review at every visit and update if presentation changes — including remission and partial remission states.

Sources

  • Centers for Medicare & Medicaid Services — 2026 ICD-10-CM
  • AAPC — ICD-10-CM Code Lookup
  • CDC — ICD-10-CM Official Guidelines for Coding and Reporting

This reference is provided for billing and documentation guidance only. It is not medical advice. For clinical decision-making, consult the current CMS ICD-10-CM Official Guidelines for Coding and Reporting, and verify code applicability against the patient's documented clinical findings.

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