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Insomnia ICD-10 Codes - A Guide for Accurate Billing

A women sleep on table cause sleep disorder of insomnia.

As a medical coding auditor with 12+ years of experience, I’ve resolved $ 500 K+ in denied claims due to incorrect insomnia coding. Let’s simplify ICD-10 codes for insomnia, sleep disorders, and comorbidities like anxiety, with real-world examples to ensure clean claims.

What is the ICD-10 Code for Insomnia?

The main ICD-10 code for insomnia is G47.00 (unspecified insomnia disorder). However, specificity is key to avoid denials:

  • Chronic Insomnia: G47.01 (lasting 3 months or more).
  • Insomnia with AnxietyG47.00 + F41.9 (unspecified anxiety).
  • Primary InsomniaF51.01 (psychogenic, non-organic).

Example: A patient diagnosed with insomnia and sleep apnea = G47.00 + G47.33.

Top 10 Insomnia ICD-10 Codes

  • G47.00: Unspecified insomnia.
  • G47.01: Chronic insomnia.
  • F51.01: Primary insomnia (non-organic).
  • G47.09: Other insomnia (e.g., paradoxical).
  • F41.9: Anxiety disorder (use with G47.00).
  • F32.9: Major depressive disorder (comorbid with insomnia).
  • G47.33: Obstructive sleep apnea (commonly overlaps).
  • R40.0: Somnolence (daytime sleepiness).
  • G47.8: Other sleep disorders (e.g., circadian rhythm issues).
  • Z72.810: Sleep deprivation (lifestyle-related).

Case Study: A Texas clinic reduced denials by 40% by replacing G47.00 with G47.01 for chronic cases.

Coding Insomnia with Comorbidities

  • Insomnia + AnxietyG47.00 + F41.9.
  • Insomnia + DepressionG47.00 + F32.9.
  • Insomnia + Sleep ApneaG47.00 + G47.33.

 

Critical Rule: Always code the underlying condition first (e.g., F32.9 before G47.00 for depression-induced insomnia).

Insomnia vs. Sleep Apnea Coding

  • Insomnia: G47.00-G47.09 (difficulty falling/staying asleep).
  • Sleep Apnea: G47.33 (obstructive type) or G47.30 (unspecified type).
  • Documentation Tip: Use Polysomnography results to justify G47.33.

Example: A patient with insomnia and apnea = G47.00 + G47.33.

3 Common Denial Reasons & Fixes

  • Using G47.00 Without Specificity: Denied if chronicity is documented.
    • Fix: Upgrade to G47.01 for chronic cases.
  • Mixing Organic & Non-Organic Codes: Billing F51.01 for OSA-related insomnia.
    • Fix: Use G47.00 for medical causes.
  • Missing Comorbid Codes: Omitting F41.9 for anxiety-linked insomnia.
    • Fix: Link all relevant diagnoses.

Key Takeaways

Before the implementation of ICD-10 in October 2015, insomnia became coded under ICD-9. The number one code used turned into 780.52 (Insomnia, unspecified).

  • G47.01 > G47.00 for chronic insomnia.
  • Always pair insomnia with comorbid codes (anxiety, depression).
  • Sleep apnea (G47.33) requires separate coding.

 

Need Help? Book a free 15-minute coding audit

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Frequently Asked Questions (FAQs)

Use G47.01 (chronic) or G47.09 (other specified) based on documentation.

DSM-5’s “Insomnia Disorder” maps to G47.00-G47.09 (not F51.01).

Yes code both (e.g., G47.00 + G47.33) if both are treated.*

G47.09 + T code (e.g., T45.1X5A for steroid-induced insomnia).*

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