ICD-10-CM 2027
ICD-10 code for routine mammogram
Encounter for screening mammogram for malignant neoplasm of breast
From the official ICD-10-CM alphabetic index entry “Mammogram (examination) › routine”. Page updated September 29, 2026.
About coding routine mammogram
The ICD-10-CM code for routine mammogram is Z12.31 (Encounter for screening mammogram for malignant neoplasm of breast).
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.-).
Don't confuse with (Excludes1 for Z12.31)
- inconclusive mammogram (R92.2)
Common questions about routine mammogram ICD-10 codes
What is the ICD-10 code for routine mammogram?
- Z12.31 — Encounter for screening mammogram 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.