C18.0 ICD-10-CM Code: Malignant neoplasm of cecum
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Inpatient Payment Groups (MS-DRG)
MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.
- MS-DRG 374 — DIGESTIVE MALIGNANCY WITH MCC (MDC 06)
- MS-DRG 375 — DIGESTIVE MALIGNANCY WITH CC (MDC 06)
- MS-DRG 376 — DIGESTIVE MALIGNANCY WITHOUT CC/MCC (MDC 06)
A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.
Risk Adjustment (CMS-HCC)
Payment categories this diagnosis maps to under CMS-HCC V28, payment year 2026.
- HCC 22 — Bladder, Colorectal, and Other Cancers (supersedes HCC 23)
Other models: CMS-HCC V22 HCC 11
Risk scores depend on the enrollee's full accepted diagnosis set and segment; a category mapping alone does not determine payment.
Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.
Official Registry Overview & Definition
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for C18.0 in the official ICD-10-CM tabular list.
Inclusion Terms
Alternative terms the tabular list files under this code.
- Malignant neoplasm of ileocecal valve
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- malignant carcinoid tumors of the colon (C7A.02-)
- Kaposi's sarcoma of gastrointestinal sites (C46.4)
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- gastrointestinal stromal tumors (C49.A-)
Nearest Codes in This Family
Official ICD-10-CM classifications closest to C18.0 in its code family, with their registry titles.
- C18 — Malignant neoplasm of colon
- C18.1 — Malignant neoplasm of appendix
- C18.2 — Malignant neoplasm of ascending colon
- C18.3 — Malignant neoplasm of hepatic flexure
- C18.4 — Malignant neoplasm of transverse colon
- C18.5 — Malignant neoplasm of splenic flexure
- C18.6 — Malignant neoplasm of descending colon
- C18.7 — Malignant neoplasm of sigmoid colon
- C18.8 — Malignant neoplasm of overlapping sites of colon
- C18.9 — Malignant neoplasm of colon, unspecified
Neoplasm Table Sites (8)
Anatomical sites from the official ICD-10-CM Table of Neoplasms that map to this code, with the matching behavior column.
- Neoplasm, neoplastic, caput coli — Malignant, Primary
- Neoplasm, neoplastic, cecum — Malignant, Primary
- Neoplasm, neoplastic, ileocecum, ileocecal (coil) (junction) (valve) — Malignant, Primary
- Neoplasm, neoplastic, intestine, intestinal, large, caput coli — Malignant, Primary
- Neoplasm, neoplastic, intestine, intestinal, large, cecum — Malignant, Primary
- Neoplasm, neoplastic, intestine, intestinal, large, colon, caput — Malignant, Primary
- Neoplasm, neoplastic, intestine, intestinal, large, ileocecum, ileocecal (coil) (valve) — Malignant, Primary
- Neoplasm, neoplastic, junction, ileocecal — Malignant, Primary