Non-Billable / Non-Specific Code
ICD-10-CM F51.1 is the diagnosis code for Hypersomnia not due to a substance or known physiological condition. This code falls under the section "Behavioral syndromes associated with physiological disturbances and physical factors" within Chapter 5 â Mental, Behavioral and Neurodevelopmental disorders (F01-F99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions are not included in F51.1. If the patient has both, code each condition separately:
Understanding where F51.1 sits in the ICD-10-CM classification helps ensure proper coding:
No, F51.1 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
F51.1 is the ICD-10-CM diagnosis code for "Hypersomnia not due to a substance or known physiological condition". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of F51.1 is F51 ("Sleep disorders not due to a substance or known physiological condition"). F51.1 provides a more specific classification within this category.
F51.1 is located in Section F50-F59 â "Behavioral syndromes associated with physiological disturbances and physical factors" within Chapter 5 of the ICD-10-CM Tabular List.
F51.1 has 4 sub-code(s) that provide more specific detail: F51.11, F51.12, F51.13, F51.19.
Use F51.1 when the patients documented diagnosis matches "Hypersomnia not due to a substance or known physiological condition" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Hypersomnia not due to a substance or known physiological condition is F51.1.
No, F51.1 is non-billable. Use a more specific sub-code for primary diagnosis billing.
F51.1 is in Chapter 5 of the ICD-10-CM Tabular List.
Yes, F51.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.