CPT code 77063 covers screening digital breast tomosynthesis, bilateral. It’s an add on code. You never bill it alone. It attaches to 77067, the bilateral screening mammography code, and that pairing rule causes more denials on this code than anything else in the radiology chapter.
If you’re a biller at a radiology practice or an OB GYN office that runs its own mammography suite, you’ve probably watched a 77063 line item bounce back with no explanation that made sense. This guide covers what the code actually describes, how to pair it, which payers pay it and which don’t, and the four denial patterns we see most often.
What does CPT 77063 mean?
CPT 77063 describes screening digital breast tomosynthesis performed on both breasts, billed in addition to a primary screening mammography procedure. The American Medical Association added it to the CPT code set in 2015 when tomosynthesis moved from investigational to standard practice.
Tomosynthesis, often called 3D mammography, captures multiple low dose images from different angles. Software reconstructs those images into thin slices. A radiologist reads through the breast tissue layer by layer instead of viewing one flattened composite. That extra dimension matters most in dense breast tissue, where overlapping structures hide lesions on conventional 2D imaging.
Three things define the code:
- Screening, not diagnostic. The patient has no symptoms, no palpable mass, no prior abnormal finding under active workup.
- Bilateral, not unilateral. Both breasts. There’s no unilateral screening tomosynthesis code, because screening protocols image both sides.
- Add on, not standalone. The code carries a plus symbol in the CPT manual. That symbol means it reports an additional service performed alongside a primary procedure.
Which code does 77063 pair with?
77063 pairs with 77067. That’s the only correct pairing for a screening study.
Bill both lines on the same claim, same date of service. 77067 goes first. 77063 follows.
Here’s where coders trip. Diagnostic tomosynthesis uses different codes entirely. If the study is diagnostic, meaning the patient has symptoms or you’re working up a prior finding, you report 77061 or 77062 depending on laterality, and the primary code becomes 77065 or 77066. Mixing screening and diagnostic codes on the same claim triggers an automatic edit at most payers.
A quick reference for the full family:
Does Medicare cover CPT 77063?
Yes. Medicare covers screening tomosynthesis when billed with 77067, and it pays separately for the add on line. The Centers for Medicare and Medicaid Services established payment for tomosynthesis in the 2015 Physician Fee Schedule and has maintained separate reimbursement since.
Coverage frequency follows standard screening mammography rules. Medicare covers one screening mammogram every 12 months for women 40 and older, and a single baseline study for women between 35 and 39. The tomosynthesis add on inherits that frequency limit. Bill it more often than the primary code allows and it denies on frequency, not on medical necessity.
Commercial coverage varies more than most billers expect. Most major national payers now cover screening tomosynthesis without cost sharing, following state legislation that mandates coverage in a majority of states. But some regional plans and self funded employer groups still classify it as investigational and push the cost to the patient. Check the plan, not the payer.
What diagnosis code do you report with 77063?
Use Z12.31, encounter for screening mammogram for malignant neoplasm of breast. That’s the primary ICD-10 code for a routine screening study on an asymptomatic patient.
Two secondary codes matter for supporting documentation:
- Z80.3, family history of malignant neoplasm of breast. Add this when the patient reports a first degree relative with breast cancer.
- The appropriate breast density code when density is documented, since density is the clinical justification most often cited for tomosynthesis.
Never report a symptom code with 77063. A palpable lump, nipple discharge, or breast pain converts the encounter to diagnostic. The moment a symptom code appears on a screening claim, the payer edits reject the whole line.
Why do 77063 claims get denied?
Four denial patterns account for most rejected tomosynthesis lines: a missing primary code, an exceeded frequency limit, an investigational determination, and a screening study that converted to diagnostic.
Denial 1: Missing or mismatched primary code The claim carries 77063 with no 77067, or pairs it with a diagnostic mammography code. The add on has nowhere to attach. This is the single most common cause and it’s entirely preventable at charge entry.
Denial 2: Frequency limit exceeded The patient had a screening study within the past 12 months. Sometimes at a different facility, which your system never saw. Eligibility verification before the appointment catches this. Skipping verification means you find out 45 days later.
Denial 3: Investigational determination A self funded plan classifies tomosynthesis as not medically necessary. The service was rendered, the coding is clean, the plan simply doesn’t cover it. These need an appeal with the clinical literature attached, or a signed ABN collected before the study. Our denial management team handles this appeal type routinely.
Denial 4: Screening and diagnostic conflict The radiologist finds something and the encounter converts mid study. Documentation reflects a diagnostic workup, but the claim went out with screening codes and Z12.31. Match the codes to what the report actually says, not to what the order said.
Free resource
Stop losing add on lines Denials on add on codes like 77063 usually trace back to charge entry, not to the coder. Our AAPC certified coders review radiology claims before submission and catch pairing errors while they’re still fixable. Docscare maintains a 99 percent clean claim rate across all specialties.
Does CPT Code 77063 need a modifier?
Usually no. As an add on code, 77063 is exempt from modifier 51. Appending it is a coding error, not a harmless extra.
Three situations do call for a modifier:
- Modifier 26 or TC. Split the professional and technical components when the reading physician and the imaging facility bill separately.
- Modifier GG. Report this when a screening study converts to diagnostic on the same day and both are performed. Medicare uses GG for tracking, and omitting it on a converted study invites a review.
- Modifier GA. Attach when you’ve collected a signed ABN because you expect the payer to deny.
Modifier 50 doesn’t apply. The code already describes a bilateral service, so appending 50 double reports laterality and denies.
How much does Medicare pay for 77063?
National Medicare payment for 77063 falls in the range of 50 to 60 dollars for the global service, with the exact amount varying by geographic practice cost index. The professional component runs roughly a third of that, the technical component the remainder.
Two things to check before you quote a number to your practice manager. First, the fee schedule updates every January, and tomosynthesis values have shifted in several recent cycles. Second, commercial rates often exceed Medicare by 20 to 40 percent on imaging, so your Medicare figure understates blended revenue.
Pull current numbers from the CMS Physician Fee Schedule Look Up Tool rather than trusting a cached rate in your practice management system.
What documentation supports a 77063 claim?
The radiology report has to name the tomosynthesis explicitly. A report that says bilateral screening mammogram performed supports 77067 and nothing else. An auditor reading that report finds no evidence a tomosynthesis study happened.
Your report needs:
- A statement that tomosynthesis was performed, named as such
- Confirmation of bilateral imaging
- The screening indication, with no symptom language
- The radiologist’s interpretation covering the tomosynthesis images specifically
- A BI-RADS assessment category, following ACR breast imaging reporting standards
- The ordering provider and the order itself
Practices lose tomosynthesis revenue on audit far more often than they lose it on initial denial. The claim pays, then a payer audit three years later pulls the reports, finds no documented tomosynthesis, and recoups. Fix the report template once and the problem disappears permanently. Practices that outsource medical billing services typically catch template gaps like this during onboarding.
Quick reference: billing 77063 correctly
- Confirm the study is screening, not diagnostic
- Verify the patient hasn’t had a screening mammogram in the past 12 months
- Bill 77067 as the primary line
- Bill 77063 on the same claim, same date of service
- Report Z12.31 as the primary diagnosis
- Add Z80.3 or a density code when documentation supports it
- Skip modifier 51 and modifier 50
- Confirm the radiology report names tomosynthesis explicitly
Frequently asked questions
Can you bill 77063 by itself?
No. 77063 is an add on code and requires a primary procedure on the same claim. Bill it with 77067 for a screening study. Submitted alone, it denies every time.
Is 77063 a bilateral code?
Yes. 77063 describes bilateral screening tomosynthesis. Don’t append modifier 50, since the code already accounts for both breasts.
What replaced G0279?
Nothing replaced it directly. G0279 was the HCPCS code Medicare used for diagnostic tomosynthesis before CPT 77061 and 77062 took over that reporting. For screening studies, 77063 has been the correct code since 2015.
Does 77063 apply to men?
Screening tomosynthesis coding doesn’t restrict by sex, but screening guidelines for men don’t recommend routine mammography. A male patient with a breast complaint gets a diagnostic study, which means diagnostic codes, not 77063.
How often can a patient receive a study billed with 77063?
Once every 12 months for most payers, matching screening mammography frequency limits. One baseline study is covered for women between 35 and 39 under Medicare.
What’s the difference between 77063 and 77062?
Both describe bilateral tomosynthesis. 77063 is screening and functions as an add on code. 77062 is diagnostic and stands alone as a primary code.
Radiology coding, handled
Radiology coding punishes small errors. One missing add on line, one wrong diagnosis code, and a study your practice already performed generates nothing. Docscare’s AAPC certified coders handle mammography and tomosynthesis coding for practices across the country, and we catch pairing errors before claims leave the building. Our clients see a 30 percent average revenue increase within the first year.
