ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesChapter 5: Mental, Behavioral and Neurodevelopmental disordersF59

F59

Billable

Unspecified behavioral syndromes associated with physiological disturbances and physical factors

Chapter 5:Mental, Behavioral and Neurodevelopmental disorders

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

Code Description

ICD-10 F59 is a billable code used to indicate a diagnosis of unspecified behavioral syndromes associated with physiological disturbances and physical factors.

Key Diagnostic Point:

F59 encompasses a range of behavioral syndromes that are not specifically classified under other mental disorders but are associated with physiological disturbances and physical factors. This code is often used when a patient exhibits behavioral symptoms that cannot be attributed to a specific psychiatric diagnosis or when the underlying physiological cause is not clearly defined. Common presentations may include eating disorders, sleep disorders, and sexual dysfunction, where the behavioral symptoms manifest as a response to physical health issues. For instance, a patient with chronic illness may develop anxiety or depression that affects their eating habits or sleep patterns. The lack of specificity in this code allows for flexibility in coding when the clinician has not yet determined the exact nature of the behavioral syndrome or when the symptoms are transient and linked to a physical condition. Accurate documentation is crucial to ensure that the underlying physiological factors are noted, as this can influence treatment and management strategies.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in clinical presentation and symptoms
  • Need for comprehensive documentation of underlying physical conditions
  • Potential overlap with other mental health diagnoses
  • Lack of specificity in the code itself

Audit Risk Factors

  • Insufficient documentation of the underlying physical condition
  • Inconsistent coding practices among different providers
  • Failure to link behavioral symptoms to physiological disturbances
  • Use of the code without adequate clinical justification

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed patient history, including physical health status and behavioral symptoms.

Common Clinical Scenarios

Patients presenting with anxiety or depression linked to chronic illness or medication side effects.

Billing Considerations

Ensure that all relevant physical health conditions are documented to support the use of F59.

Internal Medicine

Documentation Requirements

Comprehensive assessment of physical health conditions and their impact on mental health.

Common Clinical Scenarios

Patients with chronic diseases exhibiting changes in behavior, such as altered eating or sleep patterns.

Billing Considerations

Document the relationship between physical and behavioral symptoms to justify the use of F59.

Coding Guidelines

Inclusion Criteria

Use F59 When
  • According to ICD
  • 10 coding guidelines, F59 should be used when behavioral syndromes are present but cannot be classified under more specific codes
  • It is essential to document the physiological disturbances and any physical factors contributing to the behavioral symptoms

Exclusion Criteria

Do NOT use F59 When
  • Exclusion criteria include conditions that are better classified under specific mental health disorders or when the behavioral symptoms are a direct result of substance use

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits where behavioral symptoms are assessed.

Documentation Requirements

Document the patient's behavioral symptoms and any related physical health issues.

Specialty Considerations

Psychiatrists should ensure that both mental and physical health are addressed in the visit.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more detailed coding of behavioral syndromes, enabling better tracking of conditions associated with physical health. F59 provides a flexible option for coders when specific behavioral syndromes cannot be identified, but it also requires careful documentation to support its use.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more detailed coding of behavioral syndromes, enabling better tracking of conditions associated with physical health. F59 provides a flexible option for coders when specific behavioral syndromes cannot be identified, but it also requires careful documentation to support its use.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more detailed coding of behavioral syndromes, enabling better tracking of conditions associated with physical health. F59 provides a flexible option for coders when specific behavioral syndromes cannot be identified, but it also requires careful documentation to support its use.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

When should I use code F59?

Use F59 when a patient presents with behavioral symptoms that cannot be classified under more specific codes and are associated with physiological disturbances or physical factors.