CPT 77078Radiology

Ct bone density axial

CPT code 77078 covers a CT scan used to measure bone density in the spine, typically to diagnose osteoporosis or assess fracture risk. This specialized imaging test evaluates bone strength using computed tomography rather than standard DEXA scanning.

Showing rates for

National Average

Base Medicare rate

$97.04

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

0.25

PE RVU (NF)

2.73

MP RVU

0.02

Total RVU

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Verify LCD/NCD coverage criteria before ordering - Medicare coverage for 77078 is limited compared to DEXA (77080-77081) and often requires specific medical justification beyond routine osteoporosis screening
Impact: Prevents $97.04 denial and patient satisfaction issues; QCT typically reserved for cases where DEXA is inadequate
Document why DEXA scanning is insufficient or contraindicated when ordering 77078, such as severe degenerative disease, prior vertebral fractures, or need to assess trabecular bone specifically
Impact: Increases approval rate by 40-60% when medical necessity is clearly established versus routine screening indication
Bill 77078 only once per session regardless of number of vertebral levels evaluated - this is a per-session code, not per-level
Impact: Prevents automatic denial for duplicate billing; unbundling multiple units can trigger audit flags
Ensure interpretation includes specific BMD values in mg/cm³, anatomic levels scanned, technical parameters, and comparison to age-matched norms with clinical correlation
Impact: Meets documentation requirements for medical necessity and reduces post-payment audit risk by 35-45%
When billing split/shared services in hospital setting, document modifier 26 or TC appropriately - facility bills TC, radiologist bills 26
Impact: Correct modifier use ensures proper $97.04 split between facility and professional components without payment delay
Issue Advanced Beneficiary Notice (ABN) when medical necessity is questionable or frequency exceeds typical coverage limits (generally not more than once every 2 years for monitoring)

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Frequently asked questions

What is the difference between CPT 77078 and 77080 for bone density testing?

CPT 77078 is CT-based bone densitometry of the spine (QCT), while 77080 is DEXA scanning of the axial skeleton. DEXA (77080) is the standard first-line test, reimbursed separately, and more widely covered by Medicare. QCT (77078) provides volumetric 3D measurements and isolates trabecular bone but is typically reserved for cases where DEXA is inadequate due to degenerative changes, prior fractures, or technical limitations. The 2025 Medicare rate for 77078 is $97.04.

How often does Medicare cover CPT 77078 bone density scans?

Medicare typically covers bone density studies once every 23 months (approximately 2 years) for monitoring purposes. More frequent testing with 77078 requires documentation of significant clinical change such as new fractures, initiation of therapies affecting bone metabolism, or metabolic bone disease requiring closer monitoring. Medical necessity must be clearly documented, and an ABN should be issued if frequency limits may be exceeded.

What are the 2025 Medicare reimbursement rates for CPT 77078?

The 2025 Medicare national average reimbursement for CPT 77078 is $97.04 for both facility and non-facility settings. The code has 3.0 total RVUs (0.25 work RVU, 2.73 PE RVU, 0.02 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary by geographic locality based on GPCI adjustments.

Can CPT 77078 be billed with modifier 26 for professional component only?

Yes, 77078 can be split into professional (modifier 26) and technical (modifier TC) components when the physician interpretation and equipment/technologist services are billed separately. This is common in hospital settings where the facility bills the TC component and the interpreting radiologist bills the 26 component. The $97.04 total reimbursement is divided between these components according to the RVU breakdown.

What diagnosis codes support medical necessity for CPT 77078?

Common supporting ICD-10 codes include M81.0 (age-related osteoporosis without fracture), M80.x codes (osteoporosis with pathological fracture), E21.0-E21.3 (hyperparathyroidism), M48.5 (collapsed vertebra), Z79.4 (long-term corticosteroid use), and E55.9 (vitamin D deficiency). Documentation must explain why QCT is medically necessary over standard DEXA scanning, particularly citing conditions that make DEXA unreliable such as severe degenerative disease or prior vertebral fractures.

Is CPT 77078 billed per vertebral level or per session?

CPT 77078 is billed once per session regardless of the number of vertebral levels analyzed. Billing multiple units for different levels (e.g., L1, L2, L3) is incorrect and will result in denial. The code encompasses the complete axial CT bone density study, typically including analysis of L1-L3 vertebrae, as a single comprehensive service reimbursed at $97.04 for the entire study.

What documentation is needed to appeal a denial of CPT 77078?

Appeal documentation should include the original physician order with specific medical necessity, clinical notes explaining why DEXA is insufficient (degenerative changes, artifacts, prior fractures affecting accuracy), the complete radiologist interpretation report with quantitative BMD values, relevant prior imaging reports showing DEXA limitations, supporting peer-reviewed literature on QCT indications, applicable LCD/NCD excerpts, and progression notes if appealing frequency denials. Clearly demonstrate how 77078 altered clinical management or why alternative testing was inadequate.