DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C18 Malignant neoplasm of colon

  • Header · not billable

C18 is not billable. The category heads 10 billable codes in FY2027: the 10 codes directly below it.

Index → code

  • Polyposiscolicarcinoma in → C18.9
  • Polyposiscoliadenocarcinoma in → C18.9
  • Tumormucocarcinoidunspecified site → C18.1

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C15-C26 Malignant neoplasms of digestive organs (C15-C26)
  3. C18 Malignant neoplasm of colon
Billable codes
10
Subdivisions
10
CC / MCC codes
10 / 0
HCC V28 codes
10
New FY2027
0
Index entries
5

Codes in C18

  1. C18.0
    Malignant neoplasm of cecum
    BillableCC22
    Inclusion terms 1

    Inclusion terms

    • Malignant neoplasm of ileocecal valve
  2. C18.1
    Malignant neoplasm of appendix
    BillableCC22
  3. C18.2
    Malignant neoplasm of ascending colon
    BillableCC22
  4. C18.3
    Malignant neoplasm of hepatic flexure
    BillableCC22
  5. C18.4
    Malignant neoplasm of transverse colon
    BillableCC22
  6. C18.5
    Malignant neoplasm of splenic flexure
    BillableCC22
  7. C18.6
    Malignant neoplasm of descending colon
    BillableCC22
  8. C18.7
    Malignant neoplasm of sigmoid colon
    BillableCC22
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Malignant neoplasm of sigmoid (flexure)

    Excludes1

    • malignant neoplasm of rectosigmoid junction (C19) C19
  9. C18.8
    Malignant neoplasm of overlapping sites of colon
    BillableCC22
  10. C18.9
    Malignant neoplasm of colon, unspecified
    BillableCC22
    Inclusion terms 1

    Inclusion terms

    • Malignant neoplasm of large intestine NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At C18

Excludes1

  • malignant carcinoid tumors of the colon (C7A.02-) C7A.02

Notes that also apply

Block C15-C26 instructions (Excludes1 1, Excludes2 1): printed on the block page.

Chapter 2 instructions (Notes 8): printed on the chapter 2 page.

Index entries

  • Tumormucocarcinoidunspecified site → C18.1
  • Polyposiscoliadenocarcinoma in → C18.9
  • Polyposiscolicarcinoma in → C18.9
  • Adenocarcinomainadenomatouspolyposis coli → C18.9
  • Carcinoma (malignant)inadenomatouspolyposis coli → C18.9

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy