ICD-10-CM F51.1: Hypersomnia not due to a substance or known physiological condition

ICD-10-CM Diagnosis Code (2025)

Official Description for F51.1

Hypersomnia not due to a substance or known physiological condition

Coding Notes & Guidelines for F51.1

Excludes1: Not Coded Here

sleep deprivation (Z72.820)

Excludes2: Not Included Here
  • alcohol related hypersomnia (F10.182, F10.282, F10.982)
  • drug-related hypersomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
  • hypersomnia NOS (G47.10)
  • hypersomnia due to known physiological condition (G47.10)
  • idiopathic hypersomnia (G47.11, G47.12)
  • narcolepsy (G47.4-)
Code Also

associated mental disorder

Parent Code (Less Specific):

About ICD-10-CM Code F51.1 (Hypersomnia not due to a substance or known physiological condition)

ICD-10-CM code F51.1 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM F51.1 became effective on October 1, 2024.

This page provides detailed information about F51.1 - Hypersomnia not due to a substance or known physiological condition. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Hypersomnia not due to a substance or known physiological condition.