R94.138 — Abnormal results of other function studies of peripheral nervous system
R94.138 is a billable, specific ICD-10-CM code for abnormal results of other function studies of peripheral nervous system. It is valid for submission on a claim.
Risk adjustment
R94.138 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
R94.138 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56773Billing and Coding: Neurophysiology Evoked Potentials (NEPs)
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How R94.138 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 R94.138.
- Abnormal, abnormality, abnormalities›caloric test
- Abnormal, abnormality, abnormalities›function studies›nervous system›peripheral NEC
Related codes at this level
Codes that share R94.13. If R94.138 is not quite right, the correct code is usually one of these.
Questions about R94.138
- Is R94.138 a billable ICD-10-CM code?
- Yes. R94.138 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does R94.138 sit in the tabular list?
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94).