Is R90 a billable ICD-10-CM code?

No. R90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does R90 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).

R90

R90 — Abnormal findings on diagnostic imaging of central nervous system

Non-billable headerICD-10-CM

R90 is a non-billable header ICD-10-CM code for abnormal findings on diagnostic imaging of central nervous system. It cannot be billed on its own: choose one of the more specific child codes below.

Other codes that can never be billed with R90

These codes carry an Excludes1 note pointing at R90. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading R90 alone.

R22Localized swelling, mass and lump of skin and subcutaneous tissue
R93.0Abnormal findings on diagnostic imaging of skull and head, not elsewhere classified

Risk adjustment

R90 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.

Code to one of these instead R90

2 child codes. Green means billable.

Questions about R90

Is R90 a billable ICD-10-CM code?: No. R90 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does R90 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).