R90 – Abnormal findings on diagnostic imaging of central nervous system

ICD-10-CM 2027 diagnosis code · Abnormal findings on diagnostic imaging and in function studies, without diagnosis

Non-billable header

ICD-10-CM code R90

Code: R90 (claims format: R90)
Description: Abnormal findings on diagnostic imaging of central nervous system
Short description: Abnormal findings on diagnostic imaging of cnsl
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block: R90-R94 Abnormal findings on diagnostic imaging and in function studies, without diagnosis

Billable codes under R90

R90 is a header code and cannot be used on claims. Choose the most specific code:

R90.0 – Intracranial space-occupying lesion found on diagnostic imaging of central nervous systemBillable
R90.8 – Other abnormal findings on diagnostic imaging of central nervous systemHeader (more codes below)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block R90-R94

Includes:

nonspecific abnormal findings on diagnostic imaging by computerized axial tomography [CAT scan]
nonspecific abnormal findings on diagnostic imaging by magnetic resonance imaging [MRI][NMR]
nonspecific abnormal findings on diagnostic imaging by positron emission tomography [PET scan]
nonspecific abnormal findings on diagnostic imaging by thermography
nonspecific abnormal findings on diagnostic imaging by ultrasound [echogram]
nonspecific abnormal findings on diagnostic imaging by X-ray examination

Excludes1 (not coded here):

abnormal findings on antenatal screening of mother (O28.-)
diagnostic abnormal findings classified elsewhere - see Alphabetical Index

Frequently asked questions

What is ICD-10 code R90?

R90 is the ICD-10-CM code for abnormal findings on diagnostic imaging of central nervous system, in the block R90-R94 (Abnormal findings on diagnostic imaging and in function studies, without diagnosis).

Is R90 a billable code?

No. R90 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.