R90.8Other abnormal findings on diagnostic imaging of central nervous system

R90.8 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 a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within R90, choose R90.8 (Other abnormal findings on diagnostic imaging of central nervous system) only when documentation doesn't support a more specific option: intracranial space-occupying lesion found on diagnostic imaging of central nervous system (R90.0).

To report this condition, pick the subcode that matches the documentation: R90.81 (echoencephalogram), R90.82 (unspecified) and R90.89 (system).

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