R90Header code — not billable

Abnormal findings on diagnostic imaging of central nervous system

Short description: Abnormal findings on diagnostic imaging of cnsl

Chapter
18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Category
R90
Effective date
October 1, 2026

Related codes in category R90

R90.0Intcrn space-occupying lesion found on dx imaging of cnslYesR90.8Oth abnormal findings on diagnostic imaging of cnslR90.81Abnormal echoencephalogramYesR90.82White matter disease, unspecifiedYesR90.89Oth abnormal findings on diagnostic imaging of cnslYes

Frequently asked questions

What is ICD-10 code R90?

R90 is an ICD-10-CM diagnosis code for Abnormal findings on diagnostic imaging of central nervous system.

Is R90 a billable code?

No. R90 is a category/header code, not billable on its own — use one of its more specific child codes instead.

What ICD-10-CM chapter is R90 in?

R90 falls under Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

When did R90 become effective?

R90 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.

What other codes are related to R90?

R90 belongs to category R90, which includes 5 other codes — see the related codes list on this page.

ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.