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ICD-10 Guide
ICD-10 CodesF45.1

F45.1

Billable

Undifferentiated somatoform disorder

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 F45.1 is a billable code used to indicate a diagnosis of undifferentiated somatoform disorder.

Key Diagnostic Point:

Undifferentiated somatoform disorder is characterized by the presence of physical symptoms that cannot be fully explained by a medical condition or substance use. Patients often report multiple somatic complaints, such as pain, fatigue, or gastrointestinal issues, which lead to significant distress and impairment in daily functioning. Unlike other somatoform disorders, the symptoms do not meet the criteria for a specific somatic symptom disorder, making diagnosis challenging. This disorder is often associated with psychological factors, including anxiety and depression, and may co-occur with anxiety disorders, PTSD, OCD, and phobias. The symptoms can be exacerbated by stress and may lead to frequent medical consultations, resulting in a cycle of frustration for both patients and healthcare providers. Effective management often requires a multidisciplinary approach, including psychotherapy, cognitive-behavioral therapy, and sometimes pharmacotherapy to address underlying anxiety or mood disorders. Understanding the interplay between psychological and physical symptoms is crucial for effective treatment and patient education.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Overlap with other mental health disorders
  • Variability in symptom presentation
  • Need for comprehensive patient history
  • Potential for misdiagnosis

Audit Risk Factors

  • Inadequate documentation of symptoms
  • Failure to differentiate from other somatic disorders
  • Lack of evidence for psychological assessment
  • Inconsistent coding practices among providers

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed patient history, including psychological evaluations and symptom descriptions.

Common Clinical Scenarios

Patients presenting with unexplained physical symptoms alongside anxiety or mood disorders.

Billing Considerations

Ensure that psychological assessments are documented to support the diagnosis.

Primary Care

Documentation Requirements

Comprehensive documentation of physical complaints and any psychological evaluations conducted.

Common Clinical Scenarios

Patients frequently visiting for multiple unexplained symptoms without a clear medical diagnosis.

Billing Considerations

Consider referral to mental health specialists for further evaluation.

Coding Guidelines

Inclusion Criteria

Use F45.1 When
  • According to ICD
  • 10 guidelines, F45
  • 1 should be used when physical symptoms are present without a clear medical explanation
  • It is essential to document the absence of a medical diagnosis and the presence of psychological factors contributing to the symptoms

Exclusion Criteria

Do NOT use F45.1 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

90834CPT Code

Psychotherapy, 45 minutes with patient

Clinical Scenario

Used when providing therapy to address underlying psychological issues related to somatoform symptoms.

Documentation Requirements

Document the duration of the session and the therapeutic techniques used.

Specialty Considerations

Psychiatrists should ensure that the therapy aligns with the diagnosis of undifferentiated somatoform disorder.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more precise coding of mental health disorders, including undifferentiated somatoform disorder, facilitating better tracking of treatment outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more precise coding of mental health disorders, including undifferentiated somatoform disorder, facilitating better tracking of treatment outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more precise coding of mental health disorders, including undifferentiated somatoform disorder, facilitating better tracking of treatment outcomes and resource allocation.

Resources

Clinical References

  • •
    American Psychiatric Association - Diagnostic and Statistical Manual of Mental Disorders

Coding & Billing References

  • •
    American Psychiatric Association - Diagnostic and Statistical Manual of Mental Disorders

Frequently Asked Questions

What is the difference between undifferentiated somatoform disorder and somatic symptom disorder?

Undifferentiated somatoform disorder is characterized by multiple unexplained physical symptoms without meeting the criteria for a specific somatic symptom disorder, while somatic symptom disorder involves one or more specific symptoms that cause significant distress and impairment.