F51.8 — Other sleep disorders not due to a substance or known physiological condition
Is F51.8 billable?
Yes — F51.8 is billable for FY2027. F51.8 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. F51.8 may be submitted for encounters from October 1, 2026 through September 30, 2027.
F51.8 at a glance
| Code | F51.8 |
|---|---|
| Description | Other sleep disorders not due to a substance or known physiological condition |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does F51.8 group to?
F51.8 sits in MDC 19 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 887Other Mental Disorder Diagnosesmedical
How is F51.8 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to F51.8. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Parasomnia › nonorganic origin
- Disorder › sleep › nonorganic › specified NEC (of)
Excludes2 — not included here — inherited from Chapter 5
The conditions below are not part of F51.8, but a patient may have both at the same time. When documentation supports it, F51.8 and the excluded code may both be reported.
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
Excludes2 — not included here — inherited from F51
The conditions below are not part of F51.8, but a patient may have both at the same time. When documentation supports it, F51.8 and the excluded code may both be reported.
- organic sleep disorders (G47.-)
How long has F51.8 existed?
F51.8 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with F51.8?
ICD-10-CM declares these codes mutually exclusive with F51.8 — exactly one of each pair can be correct for a given encounter.
Which conditions are coded to F51.8?
What other codes are in the F51 family? (6)
- F51.0Insomnia not due to a substance or known physiological conditionnot billable
- F51.1Hypersomnia not due to a substance or known physiological conditionnot billable
- F51.3Sleepwalking [somnambulism]
- F51.4Sleep terrors [night terrors]
- F51.5Nightmare disorder
- F51.9Sleep disorder not due to a substance or known physiological condition, unspecified