29874

Arthroscopy, knee, surgical; for removal of loose body or foreign body (eg, osteochondritis dissecans fragmentation, arthrofibrotic debris), separate procedure

This procedure involves the surgical removal of loose bodies or foreign bodies from the knee joint using an arthroscope. Loose bodies can include fragments of cartilage, bone, meniscus, or synovial chondromatosis, while foreign bodies might be introduced through trauma or previous surgery. The arthroscope allows for direct visualization of the intra-articular structures, enabling precise identification and extraction of the offending material. This procedure is typically performed to alleviate mechanical symptoms such as locking, catching, pain, or effusion caused by these free-floating or lodged particles. The 'separate procedure' designation indicates that this service is usually performed independently and is not considered an integral component of a more extensive knee arthroscopy. If performed in conjunction with other knee arthroscopic procedures, appropriate coding guidelines regarding bundling must be followed.

Clinical Indications

  • Knee pain, locking, or catching caused by documented intra-articular loose bodies (e.g., fragments of cartilage, bone, meniscus, synovial chondroma).
  • Presence of foreign bodies within the knee joint causing symptoms, often post-traumatic or post-surgical.
  • Persistent mechanical symptoms despite adequate trials of conservative management.
  • Radiographic or Magnetic Resonance Imaging (MRI) evidence confirming the presence and location of loose bodies or foreign bodies.
  • Impaired range of motion or functional limitations directly attributable to mechanical obstruction by intra-articular debris.

Procedure Steps

  1. Patient positioned supine with the operative knee prepared and draped in a sterile fashion.
  2. Administration of regional (e.g., spinal) or general anesthesia.
  3. Creation of standard arthroscopic portals (e.g., inferolateral, inferomedial) for introduction of the arthroscope and surgical instruments.
  4. Systematic diagnostic arthroscopy performed to thoroughly examine all compartments of the knee joint (patellofemoral, medial, lateral) to locate loose bodies or foreign bodies.
  5. Introduction of appropriate surgical instruments (e.g., graspers, pituitary rongeurs, shavers) through accessory portals.
  6. Identification, mobilization, and careful extraction of the loose bodies or foreign bodies from the joint.
  7. Thorough irrigation of the joint to remove any remaining debris and ensure clear visualization.
  8. Final inspection of the joint to confirm complete removal and assess for any iatrogenic injury.
  9. Removal of arthroscope and instruments, followed by closure of arthroscopic portals with sutures or sterile strips.
  10. Application of sterile dressings and often a compressive knee wrap or immobilizer.

Coding Guidelines

  • CPT code 29874 is designated as a 'separate procedure'. This means it should not be reported separately when performed as an integral component of a more comprehensive arthroscopic knee procedure (e.g., meniscectomy, chondroplasty, synovectomy) in the same compartment, unless distinct additional work is performed and documented, potentially requiring a modifier such as -59 or -XU.
  • Refer to National Correct Coding Initiative (NCCI) edits for bundling guidelines when 29874 is performed with other knee arthroscopy codes. Generally, if loose body removal is incidental to another major procedure in the same compartment, it is not separately billable.
  • Documentation must clearly specify the presence of loose bodies or foreign bodies, their location, and the distinct surgical effort involved in their removal.
  • This code has a 90-day global surgical period.
  • Do not report 29874 for minimal debridement that is inherent to another primary arthroscopic procedure.

Associated ICD-10 Codes