Bone imaging 3 phase
CPT 78315 covers a three-phase bone scan, an imaging test that takes pictures of your bones at three different time intervals after injecting a radioactive tracer to detect infections, fractures, or bone diseases.
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
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
NCCI bundling edits
Loading bundling edits…
Billing tips
Ensure documentation captures all three distinct phases with timestamps: flow phase (immediately post-injection), blood pool phase (5-10 minutes), and delayed phase (2-4 hours). Missing any phase downgrades to 78306.
Impact: Potential $100+ payment reduction if downgraded to single-phase study (78306)
Document the total time span of the study including injection time and all imaging phases, as some payers require minimum 2-hour interval for delayed images to support three-phase billing.
Impact: Prevents denials and supports the 9.3 RVU assignment versus lower-valued alternatives
Bill radiopharmaceutical separately using appropriate HCPCS code (A9503 for Tc-99m bone imaging agents) as it is not included in the CPT 78315 reimbursement.
Impact: Additional $40-80 reimbursement depending on dose and payer policy
When performed bilaterally or on multiple sites, do not append modifier 50 as 78315 is inherently bilateral/whole body; document specific areas of clinical focus instead.
Impact: Prevents automatic 50% reduction some payers apply to bilateral modifier
For Medicare patients, verify that the ordering physician's NPI and indication meet appropriate use criteria if applicable in your region, as some MACs have LCD requirements for bone scintigraphy.
Impact: Prevents denials requiring costly appeals; ensures $300.82 payment
When billing with same-day diagnostic CT or MRI, ensure separate medical necessity is documented as some payers may question concurrent advanced imaging.
Impact: Reduces audit risk and supports both procedure payments without bundling
Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.
Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.
Help build the field knowledge
MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.