ICD-10-CM Codes
C00-D49 Neoplasms
C15-C26 Malignant neoplasms of digestive organs
C18- Malignant neoplasm of colon

2019 ICD-10-CM Diagnosis Code C18

Malignant neoplasm of colon

2016

2017

2018

2019

Non-Billable/Non-Specific Code

C18 should not be used for reimbursement purposes as there are multiple codes below it that contain a greater level of detail.
The 2019 edition of ICD-10-CM C18 became effective on October 1, 2018.
This is the American ICD-10-CM version of C18 - other international versions of ICD-10 C18 may differ.

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C18. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

malignant carcinoid tumors of the colon (
ICD-10-CM Diagnosis Code C7A.02
Malignant carcinoid tumors of the appendix, large intestine, and rectum
C7A.02-
)

The following code(s) above C18 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to C18:

C00-D49
2019 ICD-10-CM Range C00-D49
Neoplasms
Note
- Functional activity
- All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
- Morphology [Histology]
- Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
- Primary malignant neoplasms overlapping site boundaries
- A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
- Malignant neoplasm of ectopic tissue
- Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
Neoplasms
C15-C26
2019 ICD-10-CM Range C15-C26
Malignant neoplasms of digestive organs
Type 1 Excludes
- Kaposi's sarcoma of gastrointestinal sites (C46.4)
Type 2 Excludes
- gastrointestinal stromal tumors (C49.A-)
Malignant neoplasms of digestive organs

Clinical Information

A primary or metastatic malignant neoplasm that affects the colon. Representative examples include carcinoma, lymphoma, and sarcoma.

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change

Code annotations containing back-references to C18:

Applicable To: Z85.038

ICD-10-CM Diagnosis Code Z85.038
Personal history of other malignant neoplasm of large intestine
Applicable To
- Conditions classifiable to C18

ICD-10-CM Codes Adjacent To C18

C16.6 Malignant neoplasm of greater curvature of stomach, unspecified

C16.8 Malignant neoplasm of overlapping sites of stomach

C16.9 Malignant neoplasm of stomach, unspecified

C17 Malignant neoplasm of small intestine

C17.0 Malignant neoplasm of duodenum

C17.1 Malignant neoplasm of jejunum

C17.2 Malignant neoplasm of ileum

C17.3 Meckel's diverticulum, malignant

C17.8 Malignant neoplasm of overlapping sites of small intestine

C17.9 Malignant neoplasm of small intestine, unspecified

C18 Malignant neoplasm of colon

C18.0 Malignant neoplasm of cecum

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

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2019 ICD-10-CM Diagnosis Code C18

Malignant neoplasm of colon

Malignant carcinoid tumors of the appendix, large intestine, and rectum

Neoplasms

Malignant neoplasms of digestive organs

Personal history of other malignant neoplasm of large intestine