D24 (Benign neoplasm of breast) compared with Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast), from the official CMS tabular data. Z12.31 is the personal-history/screening code for the active disease D24 names.
Personal-history or screening code versus the active disease.
Benign neoplasm of this site (breast)
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. Z12.31 is the personal-history or screening code for the active disease D24 names.
Site match derived from the code’s own title against the CMS 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.
| D24Benign neoplasm of breast | Z12.31Encounter for screening mammogram for malignant neoplasm of breast | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | C00-D49 — Neoplasms (C00-D49) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Benign neoplasm of breast is a non-billable ICD-10-CM category code (D24). | Encounter for screening mammogram for malignant neoplasm of breast is a billable ICD-10-CM diagnosis code (Z12.31). |
| Includes | benign neoplasm of connective tissue of breast benign neoplasm of soft parts of breast fibroadenoma of breast | — |
| 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