Is C19 a billable ICD-10-CM code?

Yes. C19 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does C19 sit in the tabular list?

Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).

What cannot be coded together with C19?

C19 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

C19

C19 — Malignant neoplasm of rectosigmoid junction

Billable / specific codeICD-10-CM

C19 is a billable, specific ICD-10-CM code for malignant neoplasm of rectosigmoid junction. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

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

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Malignant neoplasm of colon with rectum
Malignant neoplasm of rectosigmoid (colon)

Other codes that can never be billed with C19

These codes carry an Excludes1 note pointing at C19. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading C19 alone.

C18.7Malignant neoplasm of sigmoid colon

Risk adjustment

C19 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 22 Bladder, Colorectal, and Other Cancers0.363 RAF

Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.

Medicare coverage

C19 is named in 111 Medicare coverage policies — 111 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52370Billing and Coding: Bevacizumab and biosimilars
A52479Oral Anticancer Drugs - Policy Article
A52479Oral Anticancer Drugs - Policy Article
A52479Oral Anticancer Drugs - Policy Article

Questions about C19

Is C19 a billable ICD-10-CM code?: Yes. C19 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does C19 sit in the tabular list?: Neoplasms (C00-D49), in the block Malignant neoplasms of digestive organs (C15-C26).
What cannot be coded together with C19?: C19 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.