Abnormal Mammogram: A Step-by-Step Guide for Primary Care NPs

You ordered the screening mammogram. The patient actually completed it, which is a win on its own. Now the result comes back abnormal, and you have to decide what happens next.

Here's a practical workflow you can use in primary care so you're not guessing.

Step 1: Order the right test

Start with the screening mammogram.

• Diagnosis code: Z12.31, Screening Mammogram for Breast Cancer.
• Timing: annually starting at age 40, earlier if high-risk. Always check the most up-to-date guidelines.

If the screening comes back abnormal:

• Order a diagnostic mammogram and a breast ultrasound.
• Diagnosis code: R92.8, Abnormal findings on diagnostic imaging of breast.
• Specify right, left, or bilateral depending on the findings.

One time saver: I keep R92.8 saved in my EMR. It almost always works for prior authorizations and prevents the call back asking for a different code.

Step 2: Read the radiologist's report

The report tells you the next step. Let it lead.

• If normal: follow the recommended interval, commonly 6 months or 1 year. Encourage breast self-awareness and prompt reporting of any changes.
• If suspicious or indeterminate: a biopsy may be recommended. I do not order biopsies myself. I refer to a trusted breast surgeon. Whoever orders the biopsy owns the interpretation and follow-up.
• If malignant or highly concerning: refer directly to a breast surgeon or a specialized breast center, and mark it urgent.

Step 3: When to skip the screening step

If the patient already has symptoms like pain, a palpable lump, nipple discharge, or skin changes, skip the screening mammogram. Go straight to a diagnostic mammogram plus breast ultrasound with the appropriate symptom-based diagnosis code.

Practical tips for busy NPs

• Save your favorite codes in the EMR. It's a real time saver.
• Build a referral list. Have a go-to breast surgeon or breast center so referrals go out fast.
• Use the report as your roadmap. The radiologist will spell out the next step.

Frequently asked questions

What code do I use when a screening mammogram comes back abnormal?
Order the diagnostic mammogram and breast ultrasound under R92.8, Abnormal findings on diagnostic imaging of breast, and specify right, left, or bilateral.

Do I order the biopsy myself?
I don't. I refer to a breast surgeon. Whoever orders the biopsy owns the interpretation and the follow-up, so keep that responsibility with the specialist.

My patient has a lump but a normal recent screening. What now?
Symptoms change the pathway. A palpable lump, nipple discharge, or skin changes go straight to diagnostic imaging, not a screening mammogram.

An abnormal mammogram feels overwhelming when you're new, but with a clear workflow it's manageable. Stick to the right codes, follow the report's recommendations, and bring in specialists when needed. If you want this kind of workflow on one page, the Clinical Desk Reference ($37 quick-reference) keeps the common ones at hand, and the Primary Care Clinical Mastery Program (AANP-accredited) goes deeper on the everyday decisions.

Education only. Use clinical judgment and your local guidelines.

Written by Allison Sowders, MSN, APRN, FNP-BC, a practicing primary care nurse practitioner and founder of Nurse Practitioner Mentor. Reviewed July 2026.