F51.13 — Hypersomnia due to other mental disorder
F51.13 is a billable, specific ICD-10-CM code for hypersomnia due to other mental disorder. It is valid for submission on a claim.
Code also
Both codes may be needed to describe the encounter fully. Sequencing depends on the reason for the visit.
- associated mental disorder
Risk adjustment
F51.13 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
F51.13 is named in 8 Medicare coverage policies — 8 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
- A56923Billing and Coding: Outpatient Sleep Studies
- A56937Billing and Coding: Psychiatry and Psychology Services
- A57065Billing and Coding: Outpatient Psychiatry and Psychology Services
How F51.13 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to F51.13.
- Hypersomnia›due to›mental disorder
Related codes at this level
Codes that share F51.1. If F51.13 is not quite right, the correct code is usually one of these.
Questions about F51.13
- Is F51.13 a billable ICD-10-CM code?
- Yes. F51.13 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does F51.13 sit in the tabular list?
- Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Behavioral syndromes associated with physiological disturbances and physical factors (F50-F59).