C20 Malignant neoplasm of rectum

The ICD-10-CM code for Malignant neoplasm of rectum is C20 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

2: Neoplasms (C00-D49)

Section

C15-C26: Malignant neoplasms of digestive organs (C15-C26)

Category C20

1 code (1 billable)

FY2026 Status

Stable since FY2024

Inclusion Terms

• Malignant neoplasm of rectal ampulla

U.S. Hospital Utilization

• An estimated 54,810 U.S. inpatient stays in 2023 included C20 among the documented diagnoses.
• 23,105 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Prevalence & Statistics

• In 2023, an estimated 1,478,528 people in the United States were living with colorectal cancer. (NCI SEER Cancer Stat Facts: Colorectal Cancer, 2023)

Official Coding Guidelines

Tx of primary site (TOC entry)

a. Admission/Encounter for treatment of primary site ............................................................. 33

Tx of secondary site (TOC entry)

b. Admission/Encounter for treatment of secondary site .......................................................... 33

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)
• NCI SEER Cancer Stat Facts: Colorectal Cancer (2023)

Cite This Page

Reference C20 with the canonical source and edition:

C20 — Malignant neoplasm of rectum. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/C20

Canonical URL: https://icd10codingpro.com/codes/C20