ICD-10-CM 2027
ICD-10 code for screening mammogram
Encounter for screening mammogram for malignant neoplasm of breast
Confirmed by the official ICD-10-CM index entry “screening (for) › neoplasm (malignant) (of) › breast › routine mammogram”. Page updated September 29, 2026.
About coding screening mammogram
The ICD-10-CM code for screening mammogram is Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on Z12.31.
Within Z12.3 (encounter for screening for malignant neoplasm of breast), Z12.31 is specifically for encounter for screening mammogram for malignant neoplasm of breast. Related codes cover other screening for malignant neoplasm of breast (Z12.39).
Don't report Z12.31 together with the conditions in its Excludes1 note: inconclusive mammogram (R92.2).
Use an additional code to identify any family history of malignant neoplasm (Z80.-).
Related Screening mammogram codes
- Z12.39 Encounter for other screening for malignant neoplasm of breast
Don't confuse with (Excludes1 for Z12.31)
- inconclusive mammogram (R92.2)
Common questions about screening mammogram ICD-10 codes
What is the ICD-10 code for screening mammogram?
- Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast. More specific codes apply when the documentation supports them: Z12.39.
What is the ICD-10 code for encounter for other screening for malignant neoplasm of breast?
- Z12.39 — Encounter for other screening for malignant neoplasm of breast.
Is Z12.31 billable?
- Yes. Z12.31 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z12.31 be used as a principal diagnosis?
- No. It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.
Is Z12.31 a CC or MCC?
- No. Z12.31 is neither a CC nor an MCC under MS-DRG v44.0.