R90.81 ICD-10-CM Code: Abnormal echoencephalogram
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99) / Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R90-R94)
R90.81
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAbnormal echoencephalogram
An abnormal result on an echoencephalogram (ultrasound imaging of the brain), indicating unusual brain structure or fluid patterns.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for R90.81 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for R90.81 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for R90.81 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for R90.81 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for R90.81 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for R90.81 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for R90.81 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is R90.81 an HCC code?
No. R90.81 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
R90.81 is the ICD-10-CM diagnosis code for abnormal echoencephalogram. An abnormal result on an echoencephalogram (ultrasound imaging of the brain), indicating unusual brain structure or fluid patterns. R90.81 sits in the ICD-10-CM chapter for symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (r00-r99), within the section covering abnormal findings on diagnostic imaging and in function studies, without diagnosis (r90-r94).
R90.81 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Specify what abnormality was found on the echoencephalogram in the medical record.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for R90.81 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Specify what abnormality was found on the echoencephalogram in the medical record
- •This code is less commonly used due to modern imaging preferences; ensure the test type is clearly documented