C44.500 ICD-10-CM Code: Unspecified malignant neoplasm of anal skin
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 / Neoplasms (C00-D49) / Melanoma and other malignant neoplasms of skin (C43-C44)
C44.500
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified malignant neoplasm of anal skin
A malignant skin cancer of the anal area where the specific type (basal cell, squamous cell, or other) has not been determined or specified.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Unspecified malignant neoplasm of anal margin
- Unspecified malignant neoplasm of perianal skin
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for C44.500 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for C44.500 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for C44.500 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for C44.500 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for C44.500 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for C44.500 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 C44.500 an HCC code?
No. C44.500 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
C44.500 is the ICD-10-CM diagnosis code for unspecified malignant neoplasm of anal skin. A malignant skin cancer of the anal area where the specific type (basal cell, squamous cell, or other) has not been determined or specified. C44.500 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering melanoma and other malignant neoplasms of skin (c43-c44).
C44.500 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.
This is an unspecified code; use only when histological type is not documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for C44.500 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.