Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Encounter for screening mammogram for malignant neoplasm of breast is a billable ICD-10-CM diagnosis code (Z12.31).

Sequencing, inclusion, and exclusion notes published for Z12.31 in the official ICD-10-CM tabular list.

Conditions that can never be reported with this code; the two are mutually exclusive.

Conditions not covered by this code, but which may be reported alongside it when both are present.

Supplementary codes the tabular list directs you to add.

Use additional code to identify any family history of malignant neoplasm (Z80.-)

Official ICD-10-CM classifications closest to Z12.31 in its code family, with their registry titles.

Z12.11 — Encounter for screening for malignant neoplasm of colon
Z12.12 — Encounter for screening for malignant neoplasm of rectum
Z12.13 — Encounter for screening for malignant neoplasm of small intestine
Z12.2 — Encounter for screening for malignant neoplasm of respiratory organs
Z12.3 — Encounter for screening for malignant neoplasm of breast
Z12.39 — Encounter for other screening for malignant neoplasm of breast
Z12.4 — Encounter for screening for malignant neoplasm of cervix
Z12.5 — Encounter for screening for malignant neoplasm of prostate
Z12.6 — Encounter for screening for malignant neoplasm of bladder
Z12.7 — Encounter for screening for malignant neoplasm of other genitourinary organs

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.