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F51.01

Billable

Primary insomnia

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

Primary insomnia is persistent difficulty falling asleep, staying asleep, or getting restful sleep that is not caused by another medical condition, medication, or mental health disorder.

Coding Tips

  • •Verify that insomnia is not secondary to another condition (sleep apnea, pain, depression); if secondary, code the underlying condition instead
  • •Document the duration (typically at least 3 months) and frequency of sleep disturbance to support the diagnosis

Code Hierarchy

└F51Sleep disorders not due to a substance or known physiological condition└F51.0Insomnia not due to a substance or known physiological condition└F51.01Primary insomnia
└F51.01Primary insomnia

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