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ICD-10 Guide
ICD-10 CodesF64.9

F64.9

Billable

Gender identity disorder, unspecified

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

Code Description

ICD-10 F64.9 is a billable code used to indicate a diagnosis of gender identity disorder, unspecified.

Key Diagnostic Point:

Gender identity disorder, unspecified (F64.9) refers to a condition where an individual experiences a marked incongruence between their experienced or expressed gender and the gender assigned at birth. This diagnosis is characterized by a persistent desire to be of the opposite gender or an insistence that one is of the opposite gender, which may manifest in various ways, including clothing choices, behavior, and social interactions. The condition can lead to significant distress or impairment in social, occupational, or other important areas of functioning. It is essential to note that this diagnosis is not limited to individuals who seek medical interventions such as hormone therapy or surgery. The unspecified designation indicates that the clinician has not specified the type of gender identity disorder, which may include aspects of gender dysphoria or other related concerns. Clinicians must conduct thorough assessments to differentiate this disorder from other mental health conditions, including personality disorders and impulse control disorders, as maladaptive behaviors may co-occur. Accurate diagnosis and coding are crucial for appropriate treatment planning and insurance reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in patient presentation and symptoms
  • Need for comprehensive documentation to support diagnosis
  • Differentiation from other mental health disorders
  • Potential for co-occurring conditions

Audit Risk Factors

  • Inadequate documentation of gender identity assessment
  • Failure to document co-occurring mental health conditions
  • Lack of evidence for the necessity of treatment
  • Misclassification of gender identity disorder with other mental health disorders

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed mental health assessments, including history of gender identity concerns, psychosocial factors, and any co-occurring disorders.

Common Clinical Scenarios

Initial evaluations for gender dysphoria, ongoing therapy for individuals exploring gender identity, and assessments for hormone therapy eligibility.

Billing Considerations

Clinicians should be aware of the evolving language and understanding of gender identity to ensure respectful and accurate documentation.

Endocrinology

Documentation Requirements

Clinical evaluations for hormone therapy, including informed consent and assessment of mental health status.

Common Clinical Scenarios

Patients seeking hormone replacement therapy as part of gender transition.

Billing Considerations

Endocrinologists must collaborate with mental health professionals to ensure comprehensive care and documentation of the patient's mental health status.

Coding Guidelines

Inclusion Criteria

Use F64.9 When
  • According to ICD
  • 10 guidelines, F64
  • 9 should be used when the clinician has determined that the patient meets the criteria for gender identity disorder but has not specified the type
  • Documentation must support the diagnosis, including the patient's history and any relevant assessments

Exclusion Criteria

Do NOT use F64.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

H0031CPT Code

Mental health assessment

Clinical Scenario

Used when conducting a comprehensive assessment for gender identity disorder.

Documentation Requirements

Document the assessment findings, including history and mental status examination.

Specialty Considerations

Psychiatrists should ensure that the assessment aligns with current standards for gender identity evaluations.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of gender identity disorders, improving the ability to capture the nuances of gender dysphoria and related conditions. This specificity aids in better treatment planning and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of gender identity disorders, improving the ability to capture the nuances of gender dysphoria and related conditions. This specificity aids in better treatment planning and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of gender identity disorders, improving the ability to capture the nuances of gender dysphoria and related conditions. This specificity aids in better treatment planning and resource allocation.

Resources

Clinical References

  • •
    World Professional Association for Transgender Health (WPATH)
  • •
    American Psychiatric Association (APA) Guidelines

Coding & Billing References

  • •
    World Professional Association for Transgender Health (WPATH)
  • •
    American Psychiatric Association (APA) Guidelines

Frequently Asked Questions

What is the difference between F64.9 and F64.0?

F64.9 is used for unspecified gender identity disorder, while F64.0 specifically refers to transsexualism, where there is a strong desire to transition to the opposite gender, often with medical interventions.

Can F64.9 be used for children?

Yes, F64.9 can be used for children, but it is essential to consider F64.1, which specifically addresses gender identity disorder in childhood.