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ICD-10 Guide
ICD-10 CodesF16.9

F16.9

Billable

Hallucinogen use, unspecified

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

Code Description

ICD-10 F16.9 is a billable code used to indicate a diagnosis of hallucinogen use, unspecified.

Key Diagnostic Point:

Hallucinogen use, unspecified (F16.9) refers to the consumption of hallucinogenic substances without specific identification of the substance or the context of use. Hallucinogens are a class of psychoactive substances that alter perception, mood, and various cognitive processes. Common hallucinogens include LSD, psilocybin (magic mushrooms), and mescaline. Individuals may use these substances recreationally or as part of a therapeutic regimen. The clinical presentation can vary widely, with symptoms ranging from visual and auditory hallucinations to profound alterations in thought processes and emotional states. The use of hallucinogens can lead to substance use disorders characterized by compulsive use despite adverse consequences. Withdrawal symptoms are generally less severe than those associated with other substances, but psychological effects can persist. Treatment often involves psychotherapy, support groups, and in some cases, medication to manage co-occurring mental health disorders. Accurate coding is essential for appropriate treatment planning and insurance reimbursement.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in substance identification and classification
  • Potential for co-occurring mental health disorders
  • Need for comprehensive patient history and documentation
  • Differentiation between use, abuse, and dependence

Audit Risk Factors

  • Inadequate documentation of substance use history
  • Failure to specify the context of use (recreational vs. therapeutic)
  • Lack of evidence for co-occurring disorders
  • Misclassification of hallucinogen use as another substance use disorder

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed patient history, including substance use patterns and mental health status.

Common Clinical Scenarios

Patients presenting with acute psychosis or mood disturbances related to hallucinogen use.

Billing Considerations

Consideration of underlying mental health conditions and the impact of hallucinogen use on treatment.

Addiction Medicine

Documentation Requirements

Comprehensive assessment of substance use, including frequency, quantity, and impact on daily functioning.

Common Clinical Scenarios

Patients seeking help for hallucinogen-related issues, including cravings and withdrawal symptoms.

Billing Considerations

Focus on harm reduction strategies and integration of behavioral therapies.

Coding Guidelines

Inclusion Criteria

Use F16.9 When
  • Follow official ICD
  • CM guidelines for coding substance use disorders
  • 9 should be used when the specific hallucinogen is not identified
  • Ensure documentation supports the diagnosis and reflects the patient's clinical status

Exclusion Criteria

Do NOT use F16.9 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

H0031CPT Code

Mental health assessment

Clinical Scenario

Used when assessing a patient for hallucinogen use.

Documentation Requirements

Document the assessment findings and treatment recommendations.

Specialty Considerations

Psychiatry and addiction medicine may require specific assessment tools.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of substance use disorders, including hallucinogens. This specificity aids in better tracking and treatment planning.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of substance use disorders, including hallucinogens. This specificity aids in better tracking and treatment planning.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of substance use disorders, including hallucinogens. This specificity aids in better tracking and treatment planning.

Resources

Clinical References

  • •
    Substance Abuse and Mental Health Services Administration (SAMHSA)

Coding & Billing References

  • •
    Substance Abuse and Mental Health Services Administration (SAMHSA)

Frequently Asked Questions

What should I document to support the use of F16.9?

Document the patient's substance use history, any symptoms experienced, and the impact on their daily life. Include details about treatment plans and any co-occurring mental health conditions.