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G99.8

Billable

Other specified disorders of nervous system in diseases classified elsewhere

G99.8 is the ICD-10-CM code for Other specified disorders of nervous system in diseases classified elsewhere. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
G00-G99
Parent
G99
Edition
FY2026

G00-G99 Diseases of the nervous system

What this means — in plain language

MedlinePlus · NIH

The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood. There are more than 600 neurologic diseases. Major types include: Diseases caused by faulty genes, such…

Read more about Neurologic Diseases at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Excludes1 — not coded here

  • •nervous system involvement in:
  • •cysticercosis (B69.0)
  • •rubella (B06.0-)
  • •syphilis (A52.1-)

Code first

  • •underlying disorder, such as:
  • •amyloidosis (E85.-)
  • •avitaminosis (E56.-)

Frequently asked questions

What is ICD-10 code G99.8?
G99.8 is the ICD-10-CM code for "Other specified disorders of nervous system in diseases classified elsewhere". It falls under G00-G99 Diseases of the nervous system.
Is G99.8 a billable code?
Yes — G99.8 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from G99.8?
Excludes1 (not coded here): nervous system involvement in:; cysticercosis (B69.0); rubella (B06.0-); syphilis (A52.1-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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