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ICD-10 Guide
ICD-10 CodesF51.13

F51.13

Billable

Hypersomnia due to other mental disorder

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

Code Description

ICD-10 F51.13 is a billable code used to indicate a diagnosis of hypersomnia due to other mental disorder.

Key Diagnostic Point:

Hypersomnia due to other mental disorder is characterized by excessive daytime sleepiness that is primarily attributed to a mental health condition other than a sleep disorder. This condition can manifest in various ways, often linked to disorders such as depression, anxiety, or other mood disorders. Patients may experience prolonged sleep episodes, difficulty waking, and a general lack of energy that can significantly impair daily functioning. The hypersomnia may be a direct result of the underlying mental disorder, where the psychological distress leads to alterations in sleep patterns. It is essential to differentiate this condition from primary hypersomnia disorders, as the treatment and management strategies will differ based on the underlying mental health issue. Clinicians must conduct thorough assessments to identify the contributing mental disorder, as effective treatment of the primary condition often alleviates the hypersomnia symptoms. This code is particularly relevant in cases where the hypersomnia is not due to a primary sleep disorder, but rather a secondary effect of a mental health issue, necessitating a comprehensive approach to diagnosis and treatment.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Requires differentiation from primary sleep disorders.
  • Involves understanding of various mental health conditions.
  • Documentation must clearly link hypersomnia to the mental disorder.
  • Potential overlap with other ICD-10 codes for sleep disorders.

Audit Risk Factors

  • Inadequate documentation linking hypersomnia to a mental disorder.
  • Misclassification of primary vs. secondary hypersomnia.
  • Failure to document the severity and impact on daily functioning.
  • Lack of comprehensive patient history.

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed mental health assessments, treatment plans, and progress notes.

Common Clinical Scenarios

Patients presenting with depression and excessive daytime sleepiness.

Billing Considerations

Ensure that the mental disorder is clearly documented as the cause of hypersomnia.

Sleep Medicine

Documentation Requirements

Sleep studies, polysomnography results, and comprehensive sleep history.

Common Clinical Scenarios

Patients with comorbid mental health disorders and sleep complaints.

Billing Considerations

Differentiate between primary sleep disorders and hypersomnia due to mental disorders.

Coding Guidelines

Inclusion Criteria

Use F51.13 When
  • According to ICD
  • 10 guidelines, F51
  • 13 should be used when hypersomnia is directly linked to another mental disorder
  • Coders must ensure that the primary mental disorder is documented and that hypersomnia is not due to a primary sleep disorder

Exclusion Criteria

Do NOT use F51.13 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

90791CPT Code

Psychiatric diagnostic evaluation

Clinical Scenario

Used when evaluating a patient for hypersomnia due to a mental disorder.

Documentation Requirements

Comprehensive evaluation notes including history, mental status exam, and treatment plan.

Specialty Considerations

Psychiatrists should ensure that the evaluation includes sleep history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of hypersomnia related to mental disorders, improving the accuracy of diagnosis and treatment planning. It emphasizes the need for detailed documentation linking symptoms to mental health conditions.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of hypersomnia related to mental disorders, improving the accuracy of diagnosis and treatment planning. It emphasizes the need for detailed documentation linking symptoms to mental health conditions.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of hypersomnia related to mental disorders, improving the accuracy of diagnosis and treatment planning. It emphasizes the need for detailed documentation linking symptoms to mental health conditions.

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

What is the difference between F51.13 and F51.10?

F51.13 is used when hypersomnia is specifically linked to another mental disorder, while F51.10 is for unspecified hypersomnia without a clear cause.