C26 ICD-10-CM Code: Malignant neoplasm of other and ill-defined digestive organs
C26 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Neoplasms (C00-D49) / Malignant neoplasms of digestive organs (C15-C26)
C26
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceMalignant neoplasm of other and ill-defined digestive organs
Malignant neoplasm of other and ill-defined digestive organs
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 C26 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for C26 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for C26 in this effective period.
Excludes 1
Official- malignant neoplasm of peritoneum and retroperitoneum (C48.-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for C26 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for C26 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for C26 in this effective period.
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 →
- Code
- C26
- Description
- Malignant neoplasm of other and ill-defined digestive organs
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
C26 is the ICD-10-CM diagnosis code for malignant neoplasm of other and ill-defined digestive organs. C26 sits in the ICD-10-CM chapter for neoplasms (c00-d49), within the section covering malignant neoplasms of digestive organs (c15-c26).
Header codes like C26 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for C26 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Excludes 1, Do NOT code together
- malignant neoplasm of peritoneum and retroperitoneum (C48.-)