ICD-10 Code for Routine Screening Mammogram
The appropriate ICD-10 code for a routine screening mammogram in an asymptomatic female patient is Z12.31 1.
Primary Coding Guideline
- Z12.31 is the specific ICD-10 code designated for encounter for screening mammogram for malignant neoplasm of breast 1
- This code should be used for all asymptomatic patients with no breast symptoms, signs, or active breast disease who are undergoing routine preventive screening 1
- The code Z12.31 signifies that the purpose of the encounter is preventive screening rather than diagnostic evaluation 1
When Z12.31 Is Appropriate
- Asymptomatic women aged 40 and older undergoing annual screening mammography as recommended by ACR and SBI guidelines 2, 1
- High-risk women under age 40 who qualify for screening mammography, though additional risk factor codes may be beneficial as secondary codes 1
- Any asymptomatic patient with no palpable masses, breast pain, nipple discharge, or other breast complaints 1
Additional Secondary Codes to Consider
- Z85.3 should be added as a secondary code if the patient has a personal history of breast cancer 1
- Z80.3 may be added for patients with family history of malignant neoplasm of breast 1
- Z15.01 may be used for patients with known genetic mutations (BRCA1/BRCA2) 1
- Z84.89 may be used for patients with genetic predisposition to breast cancer 1
Critical Coding Pitfalls to Avoid
- Do not use diagnostic codes (N60-N65 breast disorders) for screening examinations, even if the patient has a history of benign breast disease 1
- Do not use Z12.39 (general screening for other neoplasm of breast), as Z12.31 is more specific and appropriate 1
- Do not use Z01.89 (general examination code), as it is too nonspecific for breast cancer screening 1
- Do not continue using Z12.31 if the screening mammogram reveals an abnormality requiring additional imaging—subsequent diagnostic visits should use appropriate diagnostic codes 1
When to Switch from Screening to Diagnostic Codes
- If a screening mammogram reveals an abnormality requiring recall or additional imaging, the subsequent encounter should be coded with the appropriate diagnostic code rather than Z12.31 1
- For short-interval follow-up of probably benign findings (BI-RADS 3), use the appropriate diagnostic code rather than the screening code 1
- Once a patient develops symptoms or has abnormal findings, they are no longer undergoing screening and diagnostic codes become appropriate 1