F51.1 ICD-10-CM Code: Hypersomnia not due to a substance or known physiological condition
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
F51.1Hypersomnia not due to a substance or known physiological condition
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where F51.1 sits
- 1
Chapter 5
Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
- 2
Section
Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)
- 3
Category F51
Sleep disorders not due to a substance or known physiological condition
- 4
Code F51.1
Hypersomnia not due to a substance or known physiological condition
More specific choices
Codes under F51.1
F51.1 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for F51.1.
Code first
No “code first” instruction is listed for F51.1.
Use additional code
No “use additional code” instruction is listed for F51.1.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for F51.1.
Excludes2
Conditions not included here that may be reported separately when present.
- 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-)
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code F51.1 mean?
F51.1 is the FY 2027 U.S. ICD-10-CM code for “Hypersomnia not due to a substance or known physiological condition.”
Is F51.1 a billable or specific ICD-10-CM code?
No. F51.1 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is F51.1 located in ICD-10-CM?
F51.1 is listed in Chapter 5, Mental, Behavioral and Neurodevelopmental disorders (F01-F99), within Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59) (F50–F59), under category F51, Sleep disorders not due to a substance or known physiological condition.
What coding notes are listed for F51.1?
No inclusion terms are listed for F51.1 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: 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-).
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