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Official Description

Bone marrow aspiration for bone grafting, spine surgery only, through separate skin or fascial incision (List separately in addition to code for primary procedure)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 20939 involves the aspiration of bone marrow specifically for the purpose of bone grafting in spinal surgery. This technique is crucial as it provides a source of osteoprogenitor cells, which are essential for the regeneration and healing of bone tissue. The aspiration is performed through a separate skin or fascial incision, ensuring that the harvested bone marrow is not contaminated or diluted with peripheral blood, which could compromise the quality of the graft. Typically, the anterior or posterior iliac crest is the preferred site for this procedure, although other anatomical locations, such as the vertebral body, may also be utilized depending on the clinical scenario. The process requires careful technique to minimize complications and maximize the yield of bone marrow cells. During the aspiration, the bone marrow is collected directly into syringes that have been prepped with heparinized saline to prevent clotting. This code is reported in addition to the primary procedure code, highlighting its role as a supplementary intervention in spinal surgeries.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure associated with CPT® Code 20939 is indicated for the following conditions:

  • Bone Grafting Needs The aspiration of bone marrow is performed to obtain osteoprogenitor cells necessary for augmenting the site with autograft bone during spinal surgery.
  • Spinal Surgery This procedure is specifically indicated in the context of spinal surgeries where additional bone grafting is required to support healing and structural integrity.

2. Procedure

The procedure for bone marrow aspiration as described by CPT® Code 20939 involves several critical steps to ensure successful harvesting of bone marrow.

  • Site Selection The anterior or posterior iliac crest is typically selected as the site for aspiration. The choice of site may depend on the specific surgical requirements and the patient's anatomy.
  • Incision Creation A small incision is made in the skin over the selected site. For the anterior iliac crest, the incision is made approximately 4-5 cm behind the medial border, while for the posterior iliac crest, the patient is positioned prone, and the incision is made in the middle of the superficial cortex.
  • Needle and Cannula Insertion The needle and cannula assembly is advanced carefully into the iliac crest, taking care to avoid injury to surrounding nerves, such as the lateral femoral cutaneous nerve for the anterior approach and the cluneal nerves for the posterior approach.
  • Aspiration Technique Firm pressure is applied to advance the needle up to 7 cm within the cancellous bone, using an alternating clockwise and counterclockwise motion or gentle taps with a mallet to facilitate entry. Once the cannula is properly positioned, the needle is removed.
  • Bone Marrow Collection A syringe is attached to the cannula, and the plunger is pulled back to aspirate the bone marrow. If additional bone marrow is needed, the trocar needle can be reattached, and the assembly can be repositioned either through the same incision or a new one.
  • Closure of Harvest Site After the desired amount of bone marrow has been collected, the incision at the harvest site is closed appropriately to promote healing.

3. Post-Procedure

Post-procedure care following bone marrow aspiration involves monitoring the patient for any signs of complications, such as bleeding or infection at the incision site. Patients may be advised to avoid strenuous activities for a short period to allow for proper healing. Pain management may be necessary, and the healthcare provider will typically provide instructions on wound care and follow-up appointments to ensure optimal recovery.

Short Descr BONE MARROW ASPIR BONE GRFG
Medium Descr BONE MARROW ASPIRATION BONE GRFG SPI SURG ONLY
Long Descr Bone marrow aspiration for bone grafting, spine surgery only, through separate skin or fascial incision (List separately in addition to code for primary procedure)
Status Code Active Code
Global Days ZZZ - Code Related to Another Service
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 0 - No payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Items and Services Packaged into APC Rates
ASC Payment Indicator Packaged service/item; no separate payment made.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) none
MUE 1

This is an add-on code that must be used in conjunction with one of these primary codes.

22319 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Open treatment and/or reduction of odontoid fracture(s) and or dislocation(s) (including os odontoideum), anterior approach, including placement of internal fixation; with grafting
22532 MPFS Status: Active Code APC C Physician Quality Reporting Illustration for Code Arthrodesis, lateral extracavitary technique, including minimal discectomy to prepare interspace (other than for decompression); thoracic
22533 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, lateral extracavitary technique, including minimal discectomy to prepare interspace (other than for decompression); lumbar
22534 Addon Code MPFS Status: Active Code APC C Physician Quality Reporting Illustration for Code Arthrodesis, lateral extracavitary technique, including minimal discectomy to prepare interspace (other than for decompression); thoracic or lumbar, each additional vertebral segment (List separately in addition to code for primary procedure)
22548 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, anterior transoral or extraoral technique, clivus-C1-C2 (atlas-axis), with or without excision of odontoid process
22551 MPFS Status: Active Code APC J1 ASC J8 Arthrodesis, anterior interbody, including disc space preparation, discectomy, osteophytectomy and decompression of spinal cord and/or nerve roots; cervical below C2
22552 Addon Code MPFS Status: Active Code APC N ASC N1 Arthrodesis, anterior interbody, including disc space preparation, discectomy, osteophytectomy and decompression of spinal cord and/or nerve roots; cervical below C2, each additional interspace (List separately in addition to code for primary procedure)
22554 MPFS Status: Active Code APC J1 ASC J8 Physician Quality Reporting CPT Assistant Article Arthrodesis, anterior interbody technique, including minimal discectomy to prepare interspace (other than for decompression); cervical below C2
22556 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Arthrodesis, anterior interbody technique, including minimal discectomy to prepare interspace (other than for decompression); thoracic
22558 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Arthrodesis, anterior interbody technique, including minimal discectomy to prepare interspace (other than for decompression); lumbar
22590 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, posterior technique, craniocervical (occiput-C2)
22595 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, posterior technique, atlas-axis (C1-C2)
22600 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, posterior or posterolateral technique, single interspace; cervical below C2 segment
22610 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Arthrodesis, posterior or posterolateral technique, single interspace; thoracic (with lateral transverse technique, when performed)
22612 MPFS Status: Active Code APC J1 ASC J8 Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, posterior or posterolateral technique, single interspace; lumbar (with lateral transverse technique, when performed)
22630 MPFS Status: Active Code APC J1 Physician Quality Reporting CPT Assistant Article Illustration for Code Arthrodesis, posterior interbody technique, including laminectomy and/or discectomy to prepare interspace (other than for decompression), single interspace, lumbar;
22633 MPFS Status: Active Code APC J1 Arthrodesis, combined posterior or posterolateral technique with posterior interbody technique including laminectomy and/or discectomy sufficient to prepare interspace (other than for decompression), single interspace, lumbar;
22634 Addon Code MPFS Status: Active Code APC N Arthrodesis, combined posterior or posterolateral technique with posterior interbody technique including laminectomy and/or discectomy sufficient to prepare interspace (other than for decompression), single interspace, lumbar; each additional interspace (List separately in addition to code for primary procedure)
22800 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Arthrodesis, posterior, for spinal deformity, with or without cast; up to 6 vertebral segments
22802 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Arthrodesis, posterior, for spinal deformity, with or without cast; 7 to 12 vertebral segments
22804 MPFS Status: Active Code APC C Physician Quality Reporting CPT Assistant Article Arthrodesis, posterior, for spinal deformity, with or without cast; 13 or more vertebral segments
22808 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Arthrodesis, anterior, for spinal deformity, with or without cast; 2 to 3 vertebral segments
22810 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Arthrodesis, anterior, for spinal deformity, with or without cast; 4 to 7 vertebral segments
22812 MPFS Status: Active Code APC C CPT Assistant Article Illustration for Code Arthrodesis, anterior, for spinal deformity, with or without cast; 8 or more vertebral segments
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
GC This service has been performed in part by a resident under the direction of a teaching physician
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. note: this modifier should not be appended to designated "add-on" codes (see appendix d).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
81 Minimum assistant surgeon: minimum surgical assistant services are identified by adding modifier 81 to the usual procedure number.
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
93 Synchronous telemedicine service rendered via telephone or other real-time interactive audio-only telecommunications system : synchronous telemedicine service is defined as a real-time interaction between a physician or other qualified health care professional and a patient who is located away at a distant site from the physician or other qualified health care professional. the totality of the communication of information exchanged between the physician or other qualified health care professional and the patient during the course of the synchronous telemedicine service must be of an amount and nature that is sufficient to meet the key components and/or requirements of the same service when rendered via a face-to-face interaction.
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CR Catastrophe/disaster related
GF Non-physician (e.g. nurse practitioner (np), certified registered nurse anesthetist (crna), certified registered nurse (crn), clinical nurse specialist (cns), physician assistant (pa)) services in a critical access hospital
GW Service not related to the hospice patient's terminal condition
PD Diagnostic or related non diagnostic item or service provided in a wholly owned or operated entity to a patient who is admitted as an inpatient within 3 days
SG Ambulatory surgical center (asc) facility service
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
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2018-01-01 Added Code Added.
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