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title: "ICD-10-CM F51.09: Other insomnia not due to a substance or… | BillingBrief"
description: "F51.09 is for insomnia not due to a substance or known physiological condition that the provider documents as a type without its own code in F51.0 (F51.01…"
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# F51.09 Other insomnia not due to a substance or known physiological condition

ICD-10-CM · [CMS code reference](#source)

F51.09 is for insomnia not due to a substance or known physiological condition that the provider documents as a type without its own code in F51.0 (F51.01 to F51.05).

## Coding notes

From the ICD-10-CM FY2027 (effective October 1, 2026) tabular list. Notes on a parent code or category apply here too.

### Excludes2

Not part of this code, but both can be coded when both are documented.

-   alcohol related insomnia ([F10.182](https://billingbrief.com/icd10/f10.182/), [F10.282](https://billingbrief.com/icd10/f10.282/), [F10.982](https://billingbrief.com/icd10/f10.982/))
-   drug-related insomnia ([F11.182](https://billingbrief.com/icd10/f11.182/), [F11.282](https://billingbrief.com/icd10/f11.282/), [F11.982](https://billingbrief.com/icd10/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-)
-   sleep deprivation ([Z72.820](https://billingbrief.com/icd10/z72.820/))
-   organic sleep disorders (G47.-)

## Related codes

-   [`F51.01` Primary insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.01/)
-   [`F51.02` Adjustment insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.02/)
-   [`F51.03` Paradoxical insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.03/)
-   [`F51.04` Psychophysiologic insomnia ICD-10-CM](https://billingbrief.com/icd10/f51.04/)
-   [`F51.05` Insomnia due to other mental disorder ICD-10-CM](https://billingbrief.com/icd10/f51.05/)
-   [`F51.11` Primary hypersomnia ICD-10-CM](https://billingbrief.com/icd10/f51.11/)
-   [`F51.12` Insufficient sleep syndrome ICD-10-CM](https://billingbrief.com/icd10/f51.12/)
-   [`F51.13` Hypersomnia due to other mental disorder ICD-10-CM](https://billingbrief.com/icd10/f51.13/)

## Common questions

### Is F51.09 a billable code?

Yes. F51.09 is a billable ICD-10-CM code in the ICD-10-CM FY2027 (effective October 1, 2026) code set.

## From the source

Official description from [CMS](https://www.cms.gov/medicare/coding-billing/icd-10-codes).
ICD-10-CM FY2027 (effective October 1, 2026).

Code set

ICD-10-CM

Category

F51 Sleep disorders not due to a substance or known physiological condition

Chapter

Mental, behavioral and neurodevelopmental disorders

Billable

Yes

Educational reference only. Not medical, legal, or billing advice. Always check the current official code set and payer policy before you bill. [About BillingBrief and our sources](https://billingbrief.com/about/).