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Official Description

Arthroscopy, knee, surgical; for removal of loose body or foreign body (eg, osteochondritis dissecans fragmentation, chondral fragmentation)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

A surgical arthroscopy of the knee, as described by CPT® Code 29874, involves a minimally invasive procedure aimed at the removal of loose bodies or foreign bodies from the knee joint. Loose bodies can consist of various materials such as cartilage, meniscal fragments, or bone pieces that have become dislodged and are floating within the joint space. Additionally, foreign bodies may include items like bullets, broken surgical instruments, or any other materials not typically found within the knee. The procedure begins with the creation of small portal incisions on the medial and lateral sides of the knee joint, allowing for access to the internal structures. An arthroscope, which is a specialized camera, is introduced through one of these portals to provide visualization of the joint. A cannula is then inserted through a second portal, enabling the joint to be flushed with saline solution to clear debris and enhance visibility. The surgeon examines the knee for any signs of disease, injury, or infection, and locates the loose or foreign bodies for removal. The extraction process may involve the use of a grasper for smaller fragments, while larger loose bodies may require fragmentation with an osteotome followed by suctioning with a motorized shaver. After the removal of all identified loose or foreign bodies, the arthroscope, cannula, and any other instruments are withdrawn, and the portal incisions are closed to complete the procedure.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 29874 is indicated for the following conditions:

  • Loose Bodies The presence of loose bodies within the knee joint, which may include cartilage, meniscal fragments, or bone pieces that can cause pain, swelling, or mechanical symptoms.
  • Foreign Bodies The identification of foreign bodies in the knee, such as bullets or dislodged surgical instruments, which may lead to inflammation, infection, or other complications.
  • Osteochondritis Dissecans Fragmentation The need to address osteochondritis dissecans, a condition where a fragment of bone or cartilage becomes loose, potentially causing joint dysfunction.
  • Chondral Fragmentation The removal of chondral fragments that may result from injury or degeneration, contributing to joint pain and impaired mobility.

2. Procedure

The procedure for CPT® Code 29874 involves several key steps:

  • Portal Incision Creation The surgeon begins by making small incisions on the medial and lateral aspects of the knee joint. These incisions serve as access points for the arthroscopic instruments.
  • Arthroscope Introduction An arthroscope, which is a thin tube equipped with a camera, is inserted through one of the portal incisions. This allows the surgeon to visualize the internal structures of the knee joint on a monitor.
  • Cannula Insertion and Joint Flushing A cannula is then introduced through the second portal incision. Saline solution is flushed into the joint through the cannula to clear any debris and enhance visibility for the surgeon.
  • Knee Examination The surgeon carefully examines the knee joint for any signs of disease, injury, or infection, assessing the condition of the cartilage, meniscus, and other structures.
  • Identification and Removal of Loose or Foreign Bodies Once the examination is complete, the surgeon locates the loose or foreign bodies within the joint. These bodies are removed using a grasper for smaller fragments.
  • Fragmentation of Larger Bodies If larger loose bodies are present, they may be fragmented using an osteotome, a surgical instrument designed for cutting bone, and subsequently suctioned out with a motorized shaver.
  • Completion of the Procedure After all loose or foreign bodies have been successfully removed, the surgeon withdraws the arthroscope, cannula, and any other instruments used during the procedure. The portal incisions are then closed to complete the surgical process.

3. Post-Procedure

Post-procedure care following CPT® Code 29874 typically involves monitoring the patient for any immediate complications. Patients may experience some swelling and discomfort in the knee, which can be managed with ice and elevation. Physical therapy may be recommended to restore range of motion and strength in the knee joint. Follow-up appointments are essential to assess the healing process and ensure that no further loose or foreign bodies have developed. The surgeon will provide specific instructions regarding activity restrictions and rehabilitation to promote optimal recovery.

Short Descr KNEE ARTHROSCOPY/SURGERY
Medium Descr ARTHROSCOPY KNEE REMOVAL LOOSE/FOREIGN BODY
Long Descr Arthroscopy, knee, surgical; for removal of loose body or foreign body (eg, osteochondritis dissecans fragmentation, chondral fragmentation)
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 3 - Special payment adjustment rules for multiple endoscopic 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.
Endoscopic Base Code 29870  Arthroscopy, knee, diagnostic, with or without synovial biopsy (separate procedure)
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Surgical procedure on ASC list in CY 2007; payment based on OPPS relative payment weight.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P8A - Endoscopy - arthroscopy
MUE 1
CCS Clinical Classification 162 - Other OR therapeutic procedures on joints

This is a primary code that can be used with these additional add-on codes.

G0289 Add-on Code Medicare Coverage: Carrier Priced MPFS Status: Active Code APC N Arthroscopy, knee, surgical, for removal of loose body, foreign body, debridement/shaving of articular cartilage (chondroplasty) at the time of other surgical knee arthroscopy in a different compartment of the same knee
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.
LT Left side (used to identify procedures performed on the left side of the body)
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.
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).
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).
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.
74 Discontinued out-patient hospital/ambulatory surgery center (asc) procedure after administration of anesthesia: due to extenuating circumstances or those that threaten the well being of the patient, the physician may terminate a surgical or diagnostic procedure after the administration of anesthesia (local, regional block(s), general) or after the procedure was started (incision made, intubation started, scope inserted, etc). under these circumstances, the procedure started but terminated can be reported by its usual procedure number and the addition of modifier 74. note: the elective cancellation of a service prior to the administration of anesthesia and/or surgical preparation of the patient should not be reported. for physician reporting of a discontinued procedure, see modifier 53.
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.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
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).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
RT Right side (used to identify procedures performed on the right side of the body)
SG Ambulatory surgical center (asc) facility service
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
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
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