R90.89 — Other abnormal findings on diagnostic imaging of central nervous system
R90.89 is a billable, specific ICD-10-CM code for other abnormal findings on diagnostic imaging of central 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.
- Other cerebrovascular abnormality found on diagnostic imaging of central nervous system
Risk adjustment
R90.89 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
R90.89 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.
- A56421Billing and Coding: CT of the Abdomen and Pelvis
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
- A57689Billing and Coding: Lab: Flow Cytometry
How R90.89 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 R90.89.
- Abnormal, abnormality, abnormalities›diagnostic imaging›central nervous system NEC
- Abnormal, abnormality, abnormalities›diagnostic imaging›cerebrovascular NEC
Related codes at this level
Codes that share R90.8. If R90.89 is not quite right, the correct code is usually one of these.
Questions about R90.89
- Is R90.89 a billable ICD-10-CM code?
- Yes. R90.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does R90.89 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).