D12.3 ICD-10-CM Code: Benign neoplasm of transverse colon
D12.3 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · HCC Buddy coding tools
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FY 2026 Apr update / Neoplasms (C00-D49) / Benign neoplasms, except benign neuroendocrine tumors (D10-D36)
D12.3
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceBenign neoplasm of transverse colon
A benign (non-cancerous) tumor or growth found in the transverse colon, which is the horizontal portion of the large intestine. These growths are not life-threatening but may require monitoring or removal depending on their size and symptoms.
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
Official- Benign neoplasm of hepatic flexure
- Benign neoplasm of splenic flexure
Excludes 2
Official- benign carcinoid tumors of the large intestine and rectum (D3A.02-)
- polyp of colon NOS (K63.5)
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for D12.3 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for D12.3 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for D12.3 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for D12.3 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for D12.3 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is D12.3 an HCC code?
No. D12.3 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- D12.3
- Description
- Benign neoplasm of transverse colon
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
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
D12.3 is the ICD-10-CM diagnosis code for benign neoplasm of transverse colon. A benign (non-cancerous) tumor or growth found in the transverse colon, which is the horizontal portion of the large intestine. These growths are not life-threatening but may require monitoring or removal depending on their size and symptoms. D12.3 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering benign neoplasms, except benign neuroendocrine tumors (d10-d36).
D12.3 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.
Verify the specific location is documented as transverse colon; if the colon location is unspecified, use D12.9 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for D12.3 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.