Billable / Specific Code
ICD-10-CM G99.8 is the diagnosis code for Other specified 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. 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 should never be coded at the same time as G99.8. They are mutually exclusive:
Understanding where G99.8 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, G99.8 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
G99.8 is the ICD-10-CM diagnosis code for "Other specified 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.
The parent code of G99.8 is G99 ("Other disorders of nervous system in diseases classified elsewhere"). G99.8 provides a more specific classification within this category.
G99.8 is located in Section G89-G99 — "Other disorders of the nervous system" within Chapter 6 of the ICD-10-CM Tabular List.
G99.8 has 1918 sub-code(s) that provide more specific detail: A00, A01, A02, A03, A04 and more.
Use G99.8 when the patients documented diagnosis matches "Other specified 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 specified disorders of nervous system in diseases classified elsewhere is G99.8.
Yes, G99.8 can be used as a primary diagnosis code since it is billable and specific.
G99.8 is in Chapter 6 of the ICD-10-CM Tabular List.
Type 1 Excludes for G99.8 include: nervous system involvement in:; cysticercosis (B69.0); rubella (B06.0-) and more.
Yes, G99.8 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.