Orthopedic Coding Alert

Find out when to report debridement codes.

In medical coding, “unbundling” occurs when multiple CPT^® codes are reported for individual components of a procedure that should be captured by a single, comprehensive code.

For arthroscopic surgery, the CPT^® code set and CPT^® Assistant provide valuable information on reporting of arthroscopic surgical procedures, and the Centers for Medicare & Medicaid Services (CMS) enforces strict rules through the National Correct Coding Initiative (NCCI) to prevent improper overbilling. Unfortunately, CPT^® and Medicare guidelines don’t always align, and individual payer guidelines may differ from both.

Continue reading to ensure your arthroscopy claims remain compliant.

Understand NCCI Coding Principles

The NCCI program promotes national correct coding methodologies and controls improper coding that can lead to inappropriate payments in Part B claims. Here are some important elements of NCCI for coding purposes:

• Procedure-to-procedure (PTP) edits: PTP edits define pairs of CPT^® codes that you generally shouldn’t report together for the same patient on the same day.
• Comprehensive vs. component: Medicare guidelines state that if a single code describes the services performed, you must use that code. Reporting component parts separately is considered incorrect “unbundling.”
• Integral services: Procedures such as surgical access, diagnostic evaluation to assess the surgical field, and standard debridement are typically considered integral to the primary surgical arthroscopy and cannot be billed separately.

Chapter IV of the 2026 Medicare NCCI Policy Manual establishes several foundational rules for arthroscopic procedures. Those rules include:

• Surgical includes diagnostic: A surgical arthroscopy always includes a diagnostic evaluation of the same joint. If a diagnostic procedure precedes a surgical one in the same session, you’ll report only the surgical CPT^® code.
• Conversion to open procedure: If an arthroscopic attempt is converted to an open surgical procedure, you may only bill the open procedure. Reporting both the failed arthroscopy and the successful open surgery is considered unbundling. However, if the physician performs a diagnostic arthroscopy and those findings lead to the decision to perform an open procedure, you can report the diagnostic arthroscopy separately.
• Integral services: Standard steps like surgical access, joint irrigation, and simple synovectomy or debridement to visualize the surgical field are bundled into the primary procedure code and cannot be billed separately.

Recognize Key Guidelines for Arthroscopic Procedures

Knee arthroscopy procedures, which fall under the 29866 (Arthroscopy, knee, surgical; osteochondral autograft(s) (eg, mosaicplasty) (includes harvesting of the autograft[s])) through 29889 (Arthroscopically aided posterior cruciate ligament repair/augmentation or reconstruction) code range, have specific rules that dictate what can be bundled, such as:

• Debridement and cartilage shaving: Code 29877 (Arthroscopy, knee, surgical; debridement/shaving of articular cartilage (chondroplasty)) is inclusive to all meniscectomies (29880-29881 [Arthroscopy, knee, surgical; with meniscectomy …]) according to meniscectomy code descriptions.
• Synovectomies: While CPT^® guidelines may allow reporting a major synovectomy with other procedures, Medicare NCCI rules state you may not report the procedure when the provider performed it to “clean up” a joint on which another more extensive procedure is performed. Code 29875 (… synovectomy, limited (eg, plica or shelf resection) (separate procedure)) is classified as a “separate procedure” and may not be reported with another arthroscopic knee procedure on the ipsilateral knee. 
• G code: Use the Medicare-specific code G0289 (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) to report the removal of loose or foreign bodies or debridement/shaving of articular cartilage (chondroplasty) only when the physician performed the procedure in a different compartment from the primary procedure.

Shoulder arthroscopy procedures: In December 2020, the AMA revised CPT^® guidelines for 29822-29823 (Arthroscopy, shoulder, surgical; debridement …) to establish specific instructions on counting “discrete structures” to determine if the procedure qualifies as a limited (29822) or extensive (29823) debridement.

The revised guidelines also state that any structure that’s debrided as part of another reported procedure may not count toward the criteria for a debridement code. For example, if a surgeon performs an arthroscopic rotator cuff repair (29827 [… with rotator cuff repair]) and debrides the frayed edges of the cuff prior to repair, you can’t count the debridement toward meeting the criteria for either 29822 or 29823.

Medicare guidelines differ from CPT^® guidelines when it comes to reporting arthroscopic shoulder debridement. Medicare considers the shoulder a single anatomic structure, meaning many procedures on the same shoulder are bundled. Limited debridement (29822) is always included in other shoulder arthroscopy procedures, even if it’s performed in a different area of the same shoulder. Extensive debridement (29823) is bundled unless it’s performed with one of three specific exceptions:

• Distal claviculectomy: 29824 (… distal claviculectomy including distal articular surface (Mumford procedure))
• Rotator cuff repair: 29827
• Biceps tenodesis: 29828 (… biceps tenodesis)

In these cases, the debridement may be separately reportable if performed in a different area of the shoulder.

Code Hip, Ankle, Elbow, Wrist, and Hand Arthroscopy

The Medicare NCCI Policy Manual also includes guidelines for reporting debridement of joints other than the shoulder or knee. The manual deems debridement inclusive to other arthroscopic procedures performed on the same joint during the same operative session.

Example: A surgeon performs an arthroscopic excision of an osteochondral defect of the talus and a limited debridement of a tibial bone spur.

The arthroscopic excision is reported with 29891 (Arthroscopy, ankle, surgical, excision of osteochondral defect of talus and/or tibia, including drilling of the defect) and 29897 (Arthroscopy, ankle (tibiotalar and fibulotalar joints), surgical; debridement, limited) is used to report limited debridement of the tibial bone spur. However, Medicare NCCI guidelines allow you to report only code 29891.

Foreign body removals: In December 2020, the AMA revised the CPT^® code set instructions for reporting loose body removal with several codes, which include, but are not limited to:

• 29819 (Arthroscopy, shoulder, surgical; with removal of loose body or foreign body)
• 29834 (Arthroscopy, elbow, surgical; with removal of loose body or foreign body)
• 29861 (Arthroscopy, hip, surgical; with removal of loose body or foreign body)

The revised guidelines state that the loose body size must be equal to or larger than the diameter of the arthroscopic cannula and require either a separate incision or enlarged portal for removal.

Unlike the shoulder, there aren’t specific CPT^® criteria that must be met to report arthroscopic limited or extensive debridement of the ankle or elbow, and code selection is based on how the surgeon documents the procedure.

Also, you should review the CPT^® code set carefully for specific “Do not report” instructions to avoid claim denials.

Examine This Real-World Scenario

Scenario: A surgeon performs arthroscopic surgery on the left hip including repair of the labrum, resection of cam lesion, and debridement of glenoid chondromalacia.

According to the September 2011 issue of CPT^® Assistant, you may not report 29862 (Arthroscopy, hip, surgical; with debridement/shaving of articular cartilage (chondroplasty), abrasion arthroplasty, and/or resection of labrum) with 29916 (… with labral repair) or 29914 (… with femoroplasty (ie, treatment of cam lesion)). In this case, CPT^® guidelines align with Medicare NCCI edits, which deem code 29862 inclusive to codes 29916 and 29914.

Use 29916 appended with modifier LT (Left side) and 29914 appended with modifiers 51 (Multiple procedures) and LT to report this procedure.

Heidi Stout, CPC^®, COSC, President, Coder on Call, Inc.