G98.8 — Other disorders of nervous system
G98.8 is a billable, specific ICD-10-CM code for other disorders of nervous system. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Nervous system disorder NOS
Risk adjustment
G98.8 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
G98.8 is named in 4 Medicare coverage policies — 4 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
- A57206Billing and Coding: Lumbar MRI
How G98.8 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to G98.8.
- Complication›nervous system
- Disease, diseased›nervous system
- Disorder›nervous system
- Disease, diseased›nervous system›specified NEC
- Disorder›nervous system›specified NEC
Related codes at this level
Codes that share G98. If G98.8 is not quite right, the correct code is usually one of these.
Questions about G98.8
- Is G98.8 a billable ICD-10-CM code?
- Yes. G98.8 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does G98.8 sit in the tabular list?
- Diseases of the nervous system (G00-G99), in the block Other disorders of the nervous system (G89-G99).