Summary & Overview

CPT 20938: Autograft Harvest and Implantation for Bony Defects

CPT code 20938 covers intraoperative use of an autograft — bone harvested from the patient through a separate incision and implanted to fill bony defects during surgery. This code captures both the harvest and placement of autologous bone graft material and is commonly used in spine and orthopedic procedures where structural support or fusion is required. Nationally, accurate use of this code affects procedure-level reporting, surgical cost accounting, and reimbursement for bone-grafting services.

Key payers in the national context include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare. Readers will find information on typical clinical contexts for use, expected sites of service, and common modifier sets applicable to surgical billing. The publication outlines benchmarks for coding practice, highlights clinical workflow considerations for autograft harvest and implantation, and summarizes payer coverage patterns and documentation expectations where available. Data not available in the input is noted where applicable.

This summary is intended for coding specialists, surgical teams, and revenue cycle professionals seeking a concise reference on CPT code 20938, its clinical role in spine and orthopedic surgeries, and the payer landscape relevant to national billing and documentation practices.

AetnaBlue Cross Blue ShieldCignaUnitedHealthcareMedicareCPT 20938autograftspine surgeryorthopedicsbone graftsurgical billingoperating roominpatient outpatientreimbursement coding

Billing Code Overview

CPT code 20938 describes the placement of an autograft harvested from the patient to fill bony defects during a surgical procedure. The provider obtains the donor bone from the patient's own body through a separate incision and uses it intraoperatively to augment or reconstruct skeletal structures.

Service type: Autograft harvesting and implantation during surgery

Typical site of service: Inpatient or outpatient surgical setting, commonly performed in the operating room during spine or orthopedic procedures.

Clinical & Coding Specifications

Clinical Context

A 62-year-old patient with degenerative lumbar spondylosis and symptomatic foraminal stenosis presents for posterior lumbar decompression and fusion. During the operation the surgeon harvests an autologous bone graft from the patient’s posterior iliac crest through a separate incision and uses that autograft to fill bony defects and promote fusion at the instrumented levels. The perioperative workflow includes preoperative evaluation and imaging (MRI/CT and standing radiographs), intraoperative neuromonitoring as indicated, general anesthesia, a separate sterile prep and drape for the harvest site, autograft harvest and graft preparation, implantation of the autograft into the interbody and posterolateral bed, closure of both primary and harvest incisions, and immediate postoperative recovery with orders for pain control and mobilization.

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when documented work, time, or complexity for autograft harvest and graft preparation is substantially greater than typical for the primary spinal procedure.
`23`	Unusual anesthesia	Use when general anesthesia is contraindicated and the procedure required medically necessary anesthesia outside standard practice.
`26`	Professional component	Use when billing professional interpretation or performance separate from technical component for associated imaging or monitoring, if applicable.
`50`	Bilateral procedure	Use if identical autograft harvest or bilateral surgical approaches are performed and payer requires bilateral modifier for payment.
`51`	Data not available in the input.	Data not available in the input.
`52`	Reduced services	Use when the autograft harvest is started but discontinued, or the procedure is intentionally reduced in scope, documented in operative report.
`53`	Discontinued procedure	Use when the autograft harvest or primary spinal procedure is terminated due to extenuating circumstances after anesthesia is administered.
`59`	Distinct procedural service	Use to indicate a separate and distinct procedure (e.g., autograft harvest through separate incision) when bundling edits might apply.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons on the same operative session for complex reconstruction requiring shared expertise.
`76`	Data not available in the input.	Data not available in the input.
`78`	Return to OR for related procedure during postoperative period	Use when the patient returns to the operating room for a related procedure on the same site during the global period.
`80`	Assistant surgeon	Use when a qualified assistant surgeon performs part of the operation and assistant services are billed.
`81`	Minimum assistant surgeon	Use when a second assistant with lesser role is documented and billed.
`AS`	Ambulatory surgical center (facility)	Use when the procedure is performed in an ambulatory surgical center setting.
`LT`	Left side	Use to report laterality for procedures or donor site laterality when required by payer.

Taxonomy Code	Specialty	Notes
`208100000X`	Orthopaedic Surgery	Orthopedic spine surgeons commonly perform autograft harvest and spinal fusion procedures.
`2080P0222X`	Neurosurgery	Neurosurgeons perform complex spinal decompression and fusion with autograft harvesting.
`2086S0122X`	Orthopedic Spine Surgery	Spine-focused orthopedic specialists performing instrumented fusion and autograft utilization.
`207R00000X`	Pain Management	Interventional pain specialists may be involved in perioperative pain control and selection for fusion in multidisciplinary care.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M51.26`	Other intervertebral disc displacement, lumbar region	Lumbar disc displacement often causes radiculopathy leading to decompression and fusion with autograft.
`M48.06`	Spinal stenosis, lumbar region	Lumbar spinal stenosis with neurogenic claudication frequently requires decompression and fusion with autograft.
`M41.26`	Adult idiopathic scoliosis, lumbar region	Instrumented fusion with autograft can be used to correct deformity and promote fusion.
`M43.16`	Spondylolisthesis, lumbar region	Spondylolisthesis often necessitates fusion with autograft to stabilize slipped segments.
`M47.26`	Other spondylosis with radiculopathy, lumbar region	Degenerative spondylosis causing nerve root compression treated with decompression and fusion using autograft.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`20938`	Autograft for spine surgery; structural allograft or autograft obtained from the patient through a separate incision (note: this is the focal code)	Describes harvest of autologous bone from a separate incision and use to fill bony defects during spinal fusion.
`22612`	Arthrodesis, posterior or posterolateral technique, single level; lumbar	Commonly performed with autograft implantation for stabilization and fusion at the treated lumbar level.
`22840`	Posterior non-segmental instrumentation (e.g., for lumbar spine)	Instrumentation code often billed during fusion procedures where autograft is used to promote bony fusion.
`20930`	Allograft, morselized or placement of osteopromotive material, spine	Alternate graft material code for scenarios using allograft instead of autograft; relevant when autograft is supplemented or substituted.
`63030`	Laminotomy (hemilaminectomy), with decompression of nerve root(s), single vertebral segment	Decompression procedures frequently performed in the same operative session prior to fusion and grafting.