29881

Arthroscopy, knee, surgical; with meniscectomy (medial OR lateral)

CPT code 29881 represents an arthroscopic surgical procedure of the knee involving a meniscectomy of either the medial or lateral meniscus. The meniscus is a C-shaped piece of cartilage that acts as a shock absorber and stabilizer within the knee joint. When this cartilage is torn, it can cause significant pain, swelling, locking, or catching sensations in the knee, particularly during movement or weight-bearing activities. This minimally invasive procedure involves the insertion of a small camera, known as an arthroscope, through tiny incisions (portals) around the knee joint. The surgeon visualizes the internal structures of the knee on a video monitor, allowing for precise identification and assessment of the meniscal tear. Specialized instruments are then introduced through additional small portals to access the damaged meniscus. During a meniscectomy, the unstable or torn portion of the meniscus is carefully resected, or trimmed, to remove frayed edges and create a stable, smooth rim. The primary goal is to alleviate symptoms, restore knee function, and prevent further mechanical irritation or damage to the articular cartilage, while preserving as much healthy meniscal tissue as possible. This procedure is typically performed under regional or general anesthesia, and patients often return home the same day. Compared to traditional open knee surgery, arthroscopic meniscectomy usually results in less post-operative pain, smaller scars, and a faster recovery period. Post-operative rehabilitation, often including physical therapy, is crucial for regaining strength, range of motion, and full functional recovery. The specific technique and extent of the meniscectomy depend on the type, size, and location of the tear, as well as the overall condition of the knee joint.

Clinical Indications

  • Symptomatic meniscal tears (medial or lateral) causing pain, swelling, mechanical locking, or catching.
  • Acute meniscal tears unresponsive to conservative management (rest, ice, anti-inflammatories, physical therapy).
  • Degenerative meniscal tears causing persistent mechanical symptoms or pain.
  • Bucket-handle tears, radial tears, or flap tears that impede knee function or cause instability.
  • Meniscal tears in conjunction with other knee pathologies (e.g., loose bodies, chondral lesions) where meniscectomy is the primary intervention for the meniscal component.
  • Persistent effusion or synovitis attributed to an unstable meniscal fragment.

Procedure Steps

  1. **Anesthesia Administration:** The patient receives either general or regional anesthesia (e.g., spinal or epidural block).
  2. **Patient Positioning and Prep:** The patient is positioned supine on the operating table. The affected leg is prepped with an antiseptic solution and sterilely draped. A tourniquet may be applied to the thigh for bloodless field control.
  3. **Portal Placement:** Small incisions (typically 5-10 mm), called portals, are made around the knee joint. Commonly, an inferolateral portal is used for arthroscope insertion and an inferomedial portal for instrument insertion, though placement can vary.
  4. **Arthroscope Insertion and Joint Distension:** The arthroscope (a small camera) is inserted through one portal. Saline solution is infused into the joint to distend it, allowing for clear visualization of the intra-articular structures.
  5. **Diagnostic Survey:** A comprehensive diagnostic examination of the entire knee joint is performed to confirm the meniscal tear, assess its characteristics, and identify any concomitant pathologies (e.g., chondral lesions, loose bodies).
  6. **Instrument Insertion and Meniscectomy:** Specialized arthroscopic instruments, such as graspers, punches, and shavers, are inserted through other portals. The torn or unstable portion of the medial or lateral meniscus is carefully resected (trimmed), smoothed, and contoured to remove all unstable fragments and create a stable rim. Care is taken to preserve as much healthy meniscal tissue as possible.
  7. **Joint Lavage and Debridement:** The joint is thoroughly irrigated to remove any debris or loose fragments generated during the meniscectomy. Any minor synovial fringes or loose bodies in the same compartment may also be debrided.
  8. **Closure:** The arthroscope and instruments are removed. The small portal incisions are closed with sutures, staples, or sterile adhesive strips.
  9. **Dressing Application:** A sterile dressing and a compression bandage are applied to the knee.

Coding Guidelines

  • CPT 29881 describes an arthroscopic meniscectomy of either the medial *or* lateral meniscus in a single knee. If both the medial *and* lateral menisci are surgically treated in the same knee during the same session, CPT code 29880 should be reported instead.
  • This code specifically includes meniscal repair when the repair is performed in conjunction with a partial meniscectomy on the *same* meniscus. Therefore, codes for meniscal repair (e.g., 29882, 29883) should not be billed separately when 29881 is performed on the same meniscus.
  • Diagnostic arthroscopy (29870) is considered a component of any surgical arthroscopy and is not separately reportable when a surgical arthroscopy (like 29881) is performed.
  • Laterality modifiers (RT for right knee, LT for left knee) are mandatory when reporting CPT 29881 to specify the treated knee.
  • Minor debridement of articular cartilage (chondroplasty) within the same compartment as the meniscectomy is generally considered bundled into 29881. If a *significant and extensive* chondroplasty is performed in a *separate compartment* or is clearly documented as a distinct procedure, it may be separately reportable with CPT 29877 (Arthroscopy, knee, surgical; with debridement/shaving of articular cartilage) with modifier 59 or XS, but clear documentation supporting distinct work is essential.
  • Arthroscopic removal of loose bodies (29874) may be reported separately with modifier 59 if the loose body is of a significant size and located in a different compartment than the primary procedure, and its removal requires substantial additional work.
  • Arthroscopic lysis of adhesions (29871) is typically bundled with surgical arthroscopy unless performed in a distinct compartment requiring significant additional effort.

Associated ICD-10 Codes