C20 (Malignant neoplasm of rectum) compared with Z12.12 (Encounter for screening for malignant neoplasm of rectum), from the official CMS tabular data. Z12.12 is the personal-history/screening code for the active disease C20 names. MedCoder-derived
Personal-history or screening code versus the active disease.
Active disease for this site (rectum)
A personal-history code describes a condition that no longer exists and is no longer being treated, so it is not interchangeable with the active-disease code for the same site.
Source: CMS Table of Neoplasms (site match derived from the code title)
History or screening versus active disease. Z12.12 is the personal-history or screening code for the active disease C20 names.
Site match derived from the code’s own title against the CMS/CDC Table of Neoplasms. A personal-history code describes a condition that no longer exists and is no longer being treated, so it is not interchangeable with the active-disease code.
| C20Malignant neoplasm of rectum | Z12.12Encounter for screening for malignant neoplasm of rectum | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Malignant neoplasm of rectum is a billable ICD-10-CM diagnosis code (C20). | Encounter for screening for malignant neoplasm of rectum is a billable ICD-10-CM diagnosis code (Z12.12). |
| Includes | Malignant neoplasm of rectal ampulla | — |
| Use additional code | — | code to identify any family history of malignant neoplasm (Z80.-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources