Non-Billable / Non-Specific Code
ICD-10-CM G99 is the diagnosis code for Other disorders of nervous system in diseases classified elsewhere. This code falls under the section "Other disorders of the nervous system" within Chapter 6 — Diseases of the nervous system (G00-G99). 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.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where G99 sits in the ICD-10-CM classification helps ensure proper coding:
No, G99 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
G99 is the ICD-10-CM diagnosis code for "Other disorders of nervous system in diseases classified elsewhere". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
G99 is located in Section G89-G99 — "Other disorders of the nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
G99 has 3 sub-code(s) that provide more specific detail: G99.0, G99.2, G99.8.
Use G99 when the patients documented diagnosis matches "Other disorders of nervous system in diseases classified elsewhere" 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 Other disorders of nervous system in diseases classified elsewhere is G99.
No, G99 is non-billable. Use a more specific sub-code for primary diagnosis billing.
G99 is in Chapter 6 of the ICD-10-CM Tabular List.
Yes, G99 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.