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ICD-10 Guide
ICD-10 CodesG47.21

G47.21

Billable

Circadian rhythm sleep disorder, delayed sleep phase type

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

Code Description

ICD-10 G47.21 is a billable code used to indicate a diagnosis of circadian rhythm sleep disorder, delayed sleep phase type.

Key Diagnostic Point:

Circadian rhythm sleep disorder, delayed sleep phase type (DSPD) is a condition characterized by a significant misalignment between an individual's internal biological clock and the external environment, particularly in relation to sleep-wake cycles. Individuals with DSPD typically experience difficulty falling asleep at conventional times, leading to late-night sleep onset and difficulty waking up in the morning. This disorder is often associated with chronic insomnia and can significantly impair daily functioning, affecting work, social interactions, and overall quality of life. The condition is more prevalent in adolescents and young adults but can occur at any age. Diagnosis is primarily based on clinical history, sleep patterns, and may involve sleep studies to assess sleep architecture and circadian rhythms. Treatment options include behavioral interventions, light therapy, and, in some cases, pharmacotherapy to help realign the sleep-wake cycle with societal norms.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in patient presentation and symptoms
  • Need for comprehensive sleep history and assessment
  • Potential overlap with other sleep disorders
  • Documentation of treatment response and follow-up

Audit Risk Factors

  • Inadequate documentation of sleep patterns
  • Failure to document treatment plans and responses
  • Misdiagnosis due to overlapping symptoms with other sleep disorders
  • Lack of objective data from sleep studies

Specialty Focus

Medical Specialties

Sleep Medicine

Documentation Requirements

Detailed sleep history, sleep study results, treatment plans, and follow-up notes.

Common Clinical Scenarios

Patients presenting with chronic insomnia, difficulty waking up, and social or occupational impairment due to sleep issues.

Billing Considerations

Accurate interpretation of polysomnography results and correlation with clinical symptoms are crucial for proper coding.

Psychiatry

Documentation Requirements

Assessment of mood disorders, anxiety levels, and their impact on sleep patterns.

Common Clinical Scenarios

Patients with comorbid psychiatric conditions presenting with sleep disturbances.

Billing Considerations

Documentation should include the relationship between psychiatric symptoms and sleep issues.

Coding Guidelines

Inclusion Criteria

Use G47.21 When
  • According to ICD
  • 10 guidelines, G47
  • 21 should be used when the primary diagnosis is delayed sleep phase type circadian rhythm disorder
  • It is important to document the duration and severity of symptoms, as well as any treatments attempted

Exclusion Criteria

Do NOT use G47.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

95810CPT Code

Polysomnography, sleep study

Clinical Scenario

Used to evaluate sleep architecture and diagnose sleep disorders, including DSPD.

Documentation Requirements

Results of the sleep study must be documented, including sleep stages and any abnormalities.

Specialty Considerations

Sleep specialists should ensure that the study correlates with clinical symptoms for accurate coding.

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 DSPD, which enhances the ability to track and manage these conditions effectively. This specificity aids in research and treatment planning.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of sleep disorders, including DSPD, which enhances the ability to track and manage these conditions effectively. This specificity aids in research and treatment planning.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    American Academy of Sleep Medicine

Coding & Billing References

  • •
    American Academy of Sleep Medicine

Frequently Asked Questions

What is the primary treatment for delayed sleep phase disorder?

The primary treatment for delayed sleep phase disorder includes behavioral interventions such as sleep hygiene education, light therapy to advance the sleep-wake cycle, and in some cases, melatonin supplementation to help regulate sleep timing.