2024 ICD-10-CM Diagnosis Code C19

Malignant neoplasm of rectosigmoid junction

  • C19 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2024 edition of ICD-10-CM C19 became effective on October 1, 2023.
  • This is the American ICD-10-CM version of C19 – other international versions of ICD-10 C19 may differ.

Applicable To

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

Type 1 Excludes

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

The following code(s) above C19 contain annotation back-references

 that may be applicable to C19:

  • C00-D49  Neoplasms
  • C15-C26  Malignant neoplasms of digestive organs

Approximate Synonyms

  • Cancer of the rectosigmoid junction
  • Cancer of the rectosigmoid, adenocarcinoma
  • Carcinoma of the rectosigmoid junction
  • Colorectal cancer
  • Colorectal cancer, metastatic to brain
  • Colorectal malignant neoplasm metastatic to brain
  • Overlapping malignant neoplasm of colon and rectum
  • Primary adenocarcinoma of rectosigmoid junction

Clinical Information

  • A malignant tumor involving the rectum and sigmoid colon. The majority are carcinomas.
  • A primary or metastatic malignant neoplasm that affects the rectosigmoid area. Representative examples include carcinoma, lymphoma, and sarcoma.

ICD-10-CM C19 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):

  • 374 Digestive malignancy with mcc
  • 375 Digestive malignancy with cc
  • 376 Digestive malignancy without cc/mcc

Convert C19 to ICD-9-CMCode 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
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change
  • 2024 (effective 10/1/2023): No change

Code annotations containing back-references to C19:

  • Type 1 Excludes: C18.7