R93.421 ICD-10-CM Code: Abnormal radiologic findings on diagnostic imaging of right kidney
HCC Buddy Code Card
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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)
R93.421
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAbnormal radiologic findings on diagnostic imaging of right kidney
An imaging test (such as X-ray, ultrasound, or CT scan) shows an abnormal finding in the right kidney that needs further investigation or follow-up.
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 R93.421 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for R93.421 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for R93.421 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for R93.421 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for R93.421 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for R93.421 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for R93.421 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 R93.421 an HCC code?
No. R93.421 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
R93.421 is the ICD-10-CM diagnosis code for abnormal radiologic findings on diagnostic imaging of right kidney. An imaging test (such as X-ray, ultrasound, or CT scan) shows an abnormal finding in the right kidney that needs further investigation or follow-up. R93.421 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).
R93.421 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.
Use this code only when imaging findings are abnormal but the specific diagnosis is not yet confirmed.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for R93.421 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when imaging findings are abnormal but the specific diagnosis is not yet confirmed
- •Pair with the type of imaging study performed (ultrasound, CT, MRI, etc.) for complete documentation