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D01.1 vs Z12.11

D01.1 (Carcinoma in situ of rectosigmoid junction) compared with Z12.11 (Encounter for screening for malignant neoplasm of colon), from the official CMS tabular data. Z12.11 is the personal-history/screening code for the active disease D01.1 names. MedCoder-derived

Relationship

Review

Condition lifecycle relationship

Z12.11
Encounter for screening for malignant neoplasm of colon
↔
D01.1
Carcinoma in situ of rectosigmoid junction

Personal-history or screening code versus the active disease.

In-situ disease for this site (colon)

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)

Can these codes be reported together?

History or screening versus active disease. Z12.11 is the personal-history or screening code for the active disease D01.1 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.

Side by side

D01.1Carcinoma in situ of rectosigmoid junctionZ12.11Encounter for screening for malignant neoplasm of colon
Billing statusBillableBillable
ClassificationC00-D49 — NeoplasmsZ00-Z99 — Factors influencing health status and contact with health services
DefinitionCarcinoma in situ of rectosigmoid junction is a billable ICD-10-CM diagnosis code (D01.1).Encounter for screening for malignant neoplasm of colon is a billable ICD-10-CM diagnosis code (Z12.11).
Includes
Bowen's disease
erythroplasia
grade III intraepithelial neoplasia
Queyrat's erythroplasia
Encounter for screening colonoscopy NOS
Use additional code—
code to identify any family history of malignant neoplasm (Z80.-)
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources