F51.05 ICD-10-CM Code: Insomnia due to other mental disorder
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FY 2026 Apr update / Mental, Behavioral and Neurodevelopmental disorders (F01-F99) / Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59)
F51.05
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceInsomnia due to other mental disorder
Difficulty falling or staying asleep that is caused by another mental health condition, such as depression or anxiety.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for F51.05 in this effective period.
Excludes 2
Official- alcohol related insomnia (F10.182, F10.282, F10.982)
- drug-related insomnia (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)
- insomnia NOS (G47.0-)
- insomnia due to known physiological condition (G47.0-)
- organic insomnia (G47.0-)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for F51.05 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for F51.05 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for F51.05 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for F51.05 in this effective period.
Code Also
Official- associated mental disorder
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is F51.05 an HCC code?
No. F51.05 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
F51.05 is the ICD-10-CM diagnosis code for insomnia due to other mental disorder. Difficulty falling or staying asleep that is caused by another mental health condition, such as depression or anxiety. F51.05 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering behavioral syndromes associated with physiological disturbances and physical factors (f50-f59).
F51.05 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Always code the underlying mental disorder first, then use F51.05 as a secondary diagnosis.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for F51.05 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always code the underlying mental disorder first, then use F51.05 as a secondary diagnosis
- •Verify documentation clearly links the insomnia to a specific mental health condition
Code Also
- associated mental disorder