Bone marrow aspir bone grfg
CPT code 20939 is used when a doctor removes a small sample of bone marrow through a needle, which is then used as bone graft material during another surgical procedure.
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
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Billing tips
Document the exact anatomical site of marrow aspiration separate from the primary surgical site to justify modifier 59 use
Impact: Prevents bundling denials that would result in $67.93 loss per claim
Clearly distinguish CPT 20939 from diagnostic bone marrow aspiration codes (38220-38222) in operative notes by emphasizing grafting purpose
Impact: Reduces incorrect code denials and audit risk that could delay payment by 30-60 days
Bill 20939 only when bone marrow is used as actual graft material, not when merely obtaining access for other purposes
Impact: Prevents medical necessity denials and potential fraud investigations
Verify LCD/NCD policies for the primary procedure as some payers consider bone marrow aspiration inclusive to spinal fusion codes
Impact: Pre-authorization awareness prevents denials affecting the full $67.93 reimbursement
Document the volume of marrow aspirated and how it was utilized in the grafting procedure within the operative report
Impact: Strengthens medical necessity defense during audits and reduces recoupment risk
When billing with spinal fusion codes, check for CCI edits and use modifier 59 only with supporting documentation of separate site
Impact: Proper modifier use maintains 100% reimbursement versus 0% if bundled incorrectly
Common denials
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