Summary & Overview

CPT 20939: Spine Bone Marrow Aspiration for Graft Material

CPT code 20939 covers intraoperative aspiration of bone marrow from large bones to provide donor material for filling bony defects in the spine. This technically specific procedure is billed when the marrow aspiration occurs during the same operative session as spine surgery but through a separate skin or fascial incision. Nationally, the code matters because it captures a distinct graft-harvesting activity tied to spine reconstruction and fusion procedures, affecting procedure-level coding, payer coverage determinations, and bundled payment calculations.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code's clinical intent and expected site of service, typical payer coverage considerations, and where CPT 20939 fits within spine surgery billing workflows. The publication outlines common billing modifiers and service-line context (listed elsewhere in the full report), highlights potential documentation elements needed to support the separate incision and same-session aspiration, and presents benchmark and policy update summaries relevant to national reimbursement and coding compliance.

Data not available in the input for specific ICD-10 pairings, associated taxonomies, or payer-specific edits.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare20939CPTspine surgerybone marrow aspirationautologous graftoperative proceduresurgical codinggraft harvesting

Billing Code Overview

CPT code 20939 describes harvesting autologous bone marrow aspirate as donor material to fill bony defects of the spine. The procedure involves aspirating the spongy bone marrow from large bones during the same operative session as spine surgery, performed through a separate skin or fascial incision.

Service type: Intraoperative bone marrow aspiration for spine grafting
Typical site of service: Operating room or surgical suite during spine surgery

Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.

Clinical & Coding Specifications

Clinical Context

A 56-year-old male with multilevel lumbar degenerative disc disease and symptomatic spinal instability is scheduled for a posterior lumbar fusion. During the same operative session, the spine surgeon harvests autologous bone marrow aspirate from the iliac crest through a separate skin/fascial incision to obtain marrow-derived cells and graft material to pack interbody or posterolateral bony defects. The operating room workflow includes general anesthesia, positioning prone, a separate prepping and draping field for the iliac crest harvest, aspiration of bone marrow with syringe and trocar, processing (concentration or mixing with graft extenders as per facility protocol), and transfer to the spine field for application into fusion sites. Documentation includes the separate incision site, volume aspirated, technique (aspiration during same session), and that the harvest was performed as donor material to fill bony defects in the spine. Typical site of service is an inpatient or outpatient hospital operating room or ambulatory surgery center where spine fusion is performed. Service type is operative bone marrow aspiration/harvest performed concurrently with spine surgery through a separate incision.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal baseline service	Use when this procedure is performed as reported and represents the usual service.
`22`	Increased procedural services	Use when documentation supports substantially greater services than typical for this procedure.
`23`	Unusual anesthesia	Use when the patient requires general anesthesia for a procedure that is normally performed with local/regional anesthesia.
`52`	Reduced services	Use when the procedure was partially reduced or not completed as planned.
`53`	Discontinued procedure	Use when the procedure was started but terminated due to extenuating circumstances or patient condition.
`59`	Distinct procedural service	Use when the harvest is a separate incision/site distinct from the primary spine procedure to indicate distinctness.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons on the procedure.
`63`	Procedure performed on infants	Use for infant patients when age-appropriate modifier is required.
`78`	Return to operating room for related procedure during postoperative period	Use if a return to OR for related management occurs during the global period.
`79`	[Data not available in the input.]	[Data not available in the input.]
`LT`	Left side	Use to indicate the left-sided incision site for bone marrow harvest when laterality is pertinent.
`RT`	Right side	Use to indicate the right-sided incision site for bone marrow harvest when laterality is pertinent.

Taxonomy Code	Specialty	Notes
`2080S0127X`	Orthopedic Spine Surgery	Orthopedic spine surgeons commonly perform lumbar fusion and bone marrow harvest for grafting.
`2086S0105X`	Neurosurgery - Spine	Neurosurgeons who perform instrumented spinal fusion frequently harvest marrow for graft material.
`2084P0800X`	General Surgery (Spine-focused)	In some centers general surgeons with spine specialization may assist in complex spine cases.
`207R00000X`	Interventional Pain Management	May perform bone marrow aspiration when using marrow concentrates for fusion adjuncts or biologic procedures.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M51.26`	Other intervertebral disc displacement, lumbar region	Disc displacement may be associated with degenerative changes requiring fusion where marrow grafting is used.
`M48.06`	Spinal stenosis, lumbar region	Lumbar stenosis with instability often treated with decompression and fusion using graft material.
`M43.16`	Spondylolisthesis, lumbar region	Vertebral slippage often requires fusion; autologous marrow used to promote arthrodesis.
`M47.817`	Spondylosis with myelopathy or radiculopathy, lumbar region	Degenerative spondylosis leading to neural compromise where fusion and marrow grafting may be indicated.
`M54.16`	Radiculopathy, lumbar region	Nerve root compression related to degenerative disease prompting surgical fusion and grafting.
`M96.1`	Postlaminectomy syndrome, not elsewhere classified	Revision fusion procedures may use bone marrow aspirate to augment fusion in revision settings.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20930`	Allograft, morselized or placement of osteopromotive material, spine	Used when bone graft extenders or allograft materials are placed in the fusion site in addition to or instead of autologous marrow.
`22612`	Arthrodesis, posterior or posterolateral technique, single level lumbar	Common primary fusion code for which bone marrow harvest may be performed to provide graft material.
`22558`	Arthrodesis, posterior interbody lumbar, single level	Interbody fusion code where marrow aspirate may be used as graft within interbody cages.
`20931`	Autograft, morselized; small amount	Used when additional autograft bone is harvested and placed in spinal fusion sites.
`38220`	Bone marrow aspiration, unrelated to hematopoietic cell collection	Distinct aspiration code sometimes reported for marrow harvests in contexts outside spine grafting; relates to harvest technique.