F51
ICD-10Non-billable categorySleep disorders not due to a substance or known physiol cond
Official ICD-10-CM descriptor (FY2026)
Sleep disorders not due to a substance or known physiological condition
F51 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- organic sleep disorders (G47.-)
More specific codes under F51
- F51.0Insomnia not due to a substance or known physiol conditioncategory
- F51.1Hypersomnia not due to a substance or known physiol condcategory
- F51.3Sleepwalking [somnambulism]
- F51.4Sleep terrors [night terrors]
- F51.5Nightmare disorder
- F51.8Oth sleep disord not due to a sub or known physiol cond
- F51.9Sleep disorder not due to a sub or known physiol cond, unsp
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.