F51.01 – Primary insomnia

ICD-10-CM 2027 diagnosis code · Behavioral syndromes associated with physiological disturbances and physical factors

Billable code

ICD-10-CM code F51.01

Code: F51.01 (claims format: F5101)
Description: Primary insomnia
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 5. Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Block: F50-F59 Behavioral syndromes associated with physiological disturbances and physical factors
Parent codes: F51 › F51.0

Notes for F51.01

Applicable to:

Idiopathic insomnia

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

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

Excludes2 (not included here):

organic sleep disorders (G47.-)

F51.0 – Insomnia not due to a substance or known physiological condition

Excludes2 (not included here):

alcohol related insomnia (F10.182, F10.282, F10.982)
drug-related insomnia (F11.182, F11.282, 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)

Index terms for F51.01

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in F51.0

F51.02 – Adjustment insomniaBillable
F51.03 – Paradoxical insomniaBillable
F51.04 – Psychophysiologic insomniaBillable
F51.05 – Insomnia due to other mental disorderBillable
F51.09 – Other insomnia not due to a substance or known physiological conditionBillable

Frequently asked questions

What is ICD-10 code F51.01?

F51.01 is the ICD-10-CM code for primary insomnia, in the block F50-F59 (Behavioral syndromes associated with physiological disturbances and physical factors).

Is F51.01 a billable code?

Yes. F51.01 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does F51.01 belong to?

It belongs to category F51 – Sleep disorders not due to a substance or known physiological condition.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.