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ICD-10 Guide
ICD-10 CodesF51.01

F51.01

Billable

Primary insomnia

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

Code Description

ICD-10 F51.01 is a billable code used to indicate a diagnosis of primary insomnia.

Key Diagnostic Point:

Primary insomnia is a sleep disorder characterized by difficulty falling asleep, staying asleep, or waking up too early and not being able to return to sleep, occurring at least three times per week for at least three months. This condition is not attributable to other sleep disorders, medical conditions, or substance use. Patients often report daytime impairment, including fatigue, mood disturbances, and cognitive difficulties. The etiology of primary insomnia can be multifactorial, involving psychological factors such as stress, anxiety, and depression, as well as behavioral factors like poor sleep hygiene. Treatment typically involves cognitive-behavioral therapy for insomnia (CBT-I), lifestyle modifications, and, in some cases, pharmacotherapy. Accurate diagnosis and coding are crucial for effective treatment and management, as primary insomnia can significantly impact a patient's quality of life and overall health.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating primary insomnia from secondary insomnia
  • Identifying comorbid conditions that may affect sleep
  • Understanding the impact of behavioral syndromes on sleep patterns
  • Navigating documentation requirements for sleep studies

Audit Risk Factors

  • Inadequate documentation of sleep patterns and duration
  • Failure to rule out secondary causes of insomnia
  • Lack of evidence for treatment plans or follow-up
  • Misclassification of insomnia type

Specialty Focus

Medical Specialties

Sleep Medicine

Documentation Requirements

Detailed sleep history, including sleep patterns, duration, and quality; results from sleep studies if applicable.

Common Clinical Scenarios

Patients presenting with chronic insomnia complaints, referrals for sleep studies, and management of insomnia in the context of other sleep disorders.

Billing Considerations

Ensure comprehensive documentation of all sleep-related symptoms and any comorbid conditions that may affect sleep.

Psychiatry

Documentation Requirements

Assessment of psychological factors contributing to insomnia, including mental health history and current medications.

Common Clinical Scenarios

Patients with insomnia related to anxiety, depression, or other mood disorders.

Billing Considerations

Document the relationship between mental health conditions and sleep disturbances to support the diagnosis.

Coding Guidelines

Inclusion Criteria

Use F51.01 When
  • According to ICD
  • 10 guidelines, primary insomnia should be coded only when it is the primary diagnosis and not secondary to other sleep disorders or medical conditions
  • Documentation must clearly indicate the absence of other causes

Exclusion Criteria

Do NOT use F51.01 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

95806CPT Code

Polysomnography, sleep study

Clinical Scenario

Used to evaluate sleep disorders, including insomnia.

Documentation Requirements

Results of the sleep study must be documented to support diagnosis.

Specialty Considerations

Sleep specialists should ensure comprehensive reporting of findings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of sleep disorders, including primary insomnia, which enhances the ability to track and manage these conditions effectively.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of sleep disorders, including primary insomnia, which enhances the ability to track and manage these conditions effectively.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of sleep disorders, including primary insomnia, which enhances the ability to track and manage these conditions effectively.

Resources

Clinical References

  • •
    American Academy of Sleep Medicine

Coding & Billing References

  • •
    American Academy of Sleep Medicine

Frequently Asked Questions

What is the difference between primary insomnia and secondary insomnia?

Primary insomnia occurs independently without any underlying medical or psychiatric condition, while secondary insomnia is caused by other factors such as medical conditions, medications, or mental health disorders.