R27.0 — Ataxia, unspecified
R27.0 is a billable, specific ICD-10-CM code for ataxia, unspecified. It is valid for submission on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- ataxia following cerebrovascular disease (I69. with final characters -93)
Other codes that can never be billed with R27.0
These codes carry an Excludes1 note pointing at R27.0. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading R27.0 alone.
- R26Abnormalities of gait and mobility
Risk adjustment
R27.0 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
R27.0 is named in 17 Medicare coverage policies — 17 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A53057Billing and Coding: Home Health Occupational Therapy
- A53058Billing and Coding: Home Health Physical Therapy
- A53064Billing and Coding: Outpatient Occupational Therapy
- A53065Billing and Coding: Outpatient Physical Therapy
How R27.0 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 R27.0.
- Ataxia, ataxy, ataxic
- Lack of›coordination›ataxia
Related codes at this level
Codes that share R27. If R27.0 is not quite right, the correct code is usually one of these.
Questions about R27.0
- Is R27.0 a billable ICD-10-CM code?
- Yes. R27.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does R27.0 sit in the tabular list?
- Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), in the block Symptoms and signs involving the nervous and musculoskeletal systems (R25-R29).
- What cannot be coded together with R27.0?
- R27.0 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.