R90.89Other abnormal findings on diagnostic imaging of central nervous system

R90.89 is the ICD-10-CM diagnosis code for other abnormal findings on diagnostic imaging of central nervous system. It belongs to category R90 (abnormal findings on diagnostic imaging of central nervous system), block R90-R94 (abnormal findings on diagnostic imaging and in function studies, without diagnosis) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R90.8, choose R90.89 (Other abnormal findings on diagnostic imaging of central nervous system) only when documentation doesn't support a more specific option: abnormal echoencephalogram (R90.81) and white matter disease, unspecified (R90.82).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 793.99 (other nonspecific (abnormal) findings on radiological and other examinations of body structure).