ICDcodes.org
FY2027

F51.1 — Hypersomnia not due to a substance or known physiological condition

Not billable

Is F51.1 billable?

No — F51.1 is a non-billable header code. F51.1 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath F51.1.

F51.1 at a glance

CodeF51.1
DescriptionHypersomnia not due to a substance or known physiological condition
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Excludes2 — not included here

The conditions below are not part of F51.1, but a patient may have both at the same time. When documentation supports it, F51.1 and the excluded code may both be reported.

Excludes2 — not included here — inherited from Chapter 5

The conditions below are not part of F51.1, but a patient may have both at the same time. When documentation supports it, F51.1 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 F51.1, but a patient may have both at the same time. When documentation supports it, F51.1 and the excluded code may both be reported.

  • organic sleep disorders (G47.-)

What codes fall under F51.1? (4)

How long has F51.1 existed?

F51.1 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.

What other codes are in the F51 family? (6)