G99.8

G99.8: Other specified disorders of nervous system in diseases classified elsewhere

Billable / specific codeICD-10-CM

G99.8 is a billable, specific ICD-10-CM code for other specified disorders of nervous system in diseases classified elsewhere. It is valid for submission on a claim.

Check G99.8 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Code first

The underlying condition must be sequenced before this code.

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

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G99.8 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A57204Billing and Coding: MRI and CT Scans of the Head and Neck
A57206Billing and Coding: Lumbar MRI

Code history

Unchanged in every release from FY2024 to FY2027.