ICD-10-CM 2027
ICD-10 code for mammogram
Encounter for other screening for malignant neoplasm of breast
From the official ICD-10-CM alphabetic index entry “Mammogram (examination)”. Page updated September 29, 2026.
About coding mammogram
The ICD-10-CM code for mammogram is Z12.39 (Encounter for other screening 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 Z12.39.
Within Z12.3, choose Z12.39 (other screening for malignant neoplasm of breast) only when documentation doesn't support a more specific option: screening mammogram for malignant neoplasm of breast (Z12.31).
Use an additional code to identify any family history of malignant neoplasm (Z80.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific mammogram codes (official index)
- routine Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast
Common questions about mammogram ICD-10 codes
What is the ICD-10 code for mammogram?
- Z12.39 — Encounter for other screening for malignant neoplasm of breast. More specific codes apply when the documentation supports them: Z12.31.
What is the ICD-10 code for routine mammogram?
- Z12.31 — Encounter for screening mammogram for malignant neoplasm of breast.
Is Z12.39 billable?
- Yes. Z12.39 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Z12.39 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 Z12.39 a CC or MCC?
- No. Z12.39 is neither a CC nor an MCC under MS-DRG v44.0.