Joint Procedures & Arthroscopy CPT Coding: Knee, Shoulder & Hip Codes Explained

Arthroscopic and open joint procedures represent a significant portion of the Musculoskeletal Surgery section tested on the CPC exam. From diagnostic arthroscopy to total joint replacement, understanding how to code these procedures accurately is critical for exam success. This comprehensive guide covers the most commonly tested joint procedure codes and coding rules for the knee, shoulder, hip, and other major joints.

Arthroscopic vs. Open Procedures: The Key Distinction

CPT distinguishes between arthroscopic (minimally invasive, using a scope) and open (traditional incision) approaches. This distinction is fundamental because CPT assigns separate code ranges to each approach, and the coding rules differ significantly.

A key coding rule: diagnostic arthroscopy is always included in a surgical arthroscopy of the same joint. If a surgeon performs a diagnostic arthroscopy and then proceeds to a surgical arthroscopy procedure, you only code the surgical arthroscopy — the diagnostic portion is bundled. This is one of the most frequently tested bundling rules on the CPC exam.

However, if a surgeon performs a diagnostic arthroscopy and then converts to an open procedure, both the arthroscopy and the open procedure may be separately reportable with modifier 59 (Distinct Procedural Service). The rationale is that the arthroscopic and open procedures are different approaches and represent distinct work.

Exam Tip: Always check whether the operative report describes an arthroscopic procedure that converts to open. This conversion scenario is a common exam question designed to test whether you know the bundling rules.

Knee Arthroscopy (CPT 29866–29889)

The knee is the most commonly tested arthroscopic joint on the CPC exam. Key codes to know:

Meniscus Procedures

• 29880: Arthroscopy, knee, surgical — with meniscectomy (medial AND lateral, including any meniscal shaving). This is one of the most tested codes. It covers removal of both medial and lateral meniscus tissue in the same session.
• 29881: Arthroscopy, knee, surgical — with meniscectomy (medial OR lateral, including any meniscal shaving). Note the difference from 29880: one compartment vs. both. If only the medial or only the lateral meniscus is treated, use 29881.
• 29882: Meniscus repair, medial or lateral. Repair codes pay more than removal codes and represent a distinctly different procedure. Repair preserves the meniscus tissue rather than excising it.
• 29883: Meniscus repair, medial and lateral. Both compartments repaired in the same session.

Critical Distinction: Meniscectomy (removal, 29880/29881) vs. meniscus repair (29882/29883) is a high-yield exam topic. Read the operative report carefully — “trimmed,” “excised,” “debrided,” or “shaved” indicates removal (meniscectomy). “Sutured,” “repaired,” or “reattached” indicates repair.

Other Key Knee Arthroscopy Codes

• 29876: Synovectomy, major (more than two compartments). Removal of inflamed synovial tissue. “Major” means more than two compartments were treated.
• 29877: Debridement/shaving of articular cartilage (chondroplasty). A very common procedure — smoothing rough or damaged cartilage surfaces. Often performed alongside meniscectomy.
• 29879: Abrasion arthroplasty (includes chondroplasty where necessary). More aggressive than simple chondroplasty — involves abrading the bone surface to promote fibrocartilage growth.
• 29888: ACL reconstruction, arthroscopically assisted. One of the highest-value knee arthroscopy codes. Anterior cruciate ligament reconstruction using autograft or allograft tissue.
• 29889: PCL reconstruction, arthroscopically assisted. Posterior cruciate ligament reconstruction — less common than ACL but still testable.
• 29866: OATS procedure (osteochondral autograft transfer). Transplanting a plug of healthy cartilage and bone to fill a defect.
• 29867: OATS procedure, allograft. Same concept but using donor tissue instead of autograft.

Knee Arthroscopy Bundling Rules

When multiple arthroscopic procedures are performed on the same knee during the same session, be aware of these bundling rules:

• Chondroplasty (29877) performed in the same compartment as a meniscectomy is typically bundled — do not report separately.
• If chondroplasty is performed in a different compartment than the meniscectomy, it may be separately reportable with modifier 59.
• Diagnostic arthroscopy is always bundled into surgical arthroscopy of the same joint.
• Loose body removal (29874) performed with other surgical arthroscopy in the same joint — check payer policies, as bundling varies.

Shoulder Arthroscopy (CPT 29805–29828)

Shoulder arthroscopy is the second most commonly tested joint on the CPC exam. The shoulder’s complex anatomy (rotator cuff, labrum, biceps tendon, acromioclavicular joint) creates many coding scenarios.

Key Shoulder Arthroscopy Codes

• 29805: Diagnostic arthroscopy of the shoulder (only reported when no surgical procedure follows). If a surgical arthroscopy is performed, 29805 is bundled and should not be reported separately.
• 29819: Removal of loose body from the shoulder joint.
• 29820: Synovectomy, partial. Removal of part of the inflamed synovial lining.
• 29821: Synovectomy, complete. Removal of the entire synovial lining — more extensive than 29820.
• 29822: Debridement, limited (1-2 discrete structures). Light cleanup of damaged tissue.
• 29823: Extensive debridement (3 or more discrete structures). More thorough debridement — the number of structures treated determines the code.
• 29824: Distal claviculectomy (Mumford procedure) — includes coracoacromial ligament release. Removal of the distal end of the clavicle, commonly performed for acromioclavicular joint arthritis.
• 29826: Subacromial decompression (acromioplasty). Shaving the undersurface of the acromion to create more space for the rotator cuff. One of the most commonly performed shoulder arthroscopic procedures.
• 29827: Rotator cuff repair. One of the highest-value shoulder arthroscopy codes. Reattachment of torn rotator cuff tendon(s) to the humeral head.
• 29828: Biceps tenodesis. Detaching the biceps tendon from its attachment inside the shoulder joint and reattaching it to the humerus. Often performed alongside rotator cuff repair.

Shoulder Arthroscopy Bundling

Subacromial decompression (29826) is frequently performed alongside rotator cuff repair (29827). Many payers bundle 29826 into 29827 when performed together. Check payer-specific guidelines, but for the CPC exam, know that these are separate codes and may be reported together with appropriate modifier documentation.

Debridement codes (29822/29823) are typically bundled into more definitive procedures like rotator cuff repair when performed on the same structures during the same session.

Hip Arthroscopy (CPT 29860–29863)

Hip arthroscopy has grown significantly in recent years but has a smaller code set than knee or shoulder arthroscopy.

• 29860: Diagnostic hip arthroscopy with or without synovial biopsy. Only reported when no surgical procedure follows.
• 29861: Hip arthroscopy, surgical — removal of loose body or foreign body.
• 29862: Hip arthroscopy, surgical — debridement, with or without removal of loose body or foreign body. More comprehensive than 29861.
• 29863: Hip arthroscopy, surgical — with acetabular labral repair. Repair of the labrum (ring of cartilage around the hip socket). This is the most commonly performed hip arthroscopy procedure and the most likely to appear on the CPC exam.
• 29914: Femoroplasty (reshaping of the femoral head/neck junction). Used for cam-type femoroacetabular impingement (FAI).
• 29915: Acetabuloplasty (reshaping of the acetabular rim). Used for pincer-type FAI.
• 29916: Labral reconstruction using graft tissue. More complex than repair (29863) — used when the labrum is too damaged to repair.

Open Joint Procedures and Total Joint Replacement

Total Knee Replacement (Arthroplasty)

• 27447: Total knee arthroplasty (TKA). Replacement of the entire knee joint with prosthetic components. One of the most commonly performed orthopedic procedures.
• 27446: Unicompartmental knee arthroplasty (partial knee replacement). Only one compartment of the knee (medial or lateral) is replaced. Less invasive than TKA.
• 27486: Revision of total knee arthroplasty. Removal of failed prosthetic components and implantation of new ones. More complex and higher-valued than primary TKA.
• 27487: Revision TKA with removal of components, and reinsertion of new components (1 component).

Total Hip Replacement (Arthroplasty)

• 27130: Total hip arthroplasty (THA). Replacement of the femoral head and acetabulum with prosthetic components.
• 27132: Conversion of previous hip surgery to total hip arthroplasty. Used when a prior hip procedure (hemiarthroplasty, pinning) has failed and is converted to a full THA.
• 27134: Revision of total hip arthroplasty — both acetabular and femoral components revised.
• 27236: Bipolar hemiarthroplasty. Only the femoral head is replaced (the acetabulum is left intact). Common in elderly patients with hip fractures.

Total Shoulder Replacement

• 23472: Total shoulder arthroplasty (anatomic). Replacement of both the humeral head and the glenoid socket.
• 23473: Revision of total shoulder arthroplasty — humeral or glenoid component.
• 23474: Revision of total shoulder arthroplasty — humeral and glenoid components.
• 23470: Hemiarthroplasty of the shoulder. Only the humeral head is replaced.

Coding Rules and Common Exam Traps

Multiple Procedures, Same Joint

When multiple arthroscopic procedures are performed on the same joint during the same operative session, check for bundling. Many arthroscopic procedures are commonly performed together (e.g., meniscectomy + chondroplasty, rotator cuff repair + subacromial decompression). The NCCI (National Correct Coding Initiative) edits determine which code pairs can and cannot be reported together.

Bilateral Procedures

When the same procedure is performed on both sides (bilateral total knee replacement, bilateral shoulder arthroscopy), append modifier 50 (Bilateral Procedure) to indicate bilateral performance. Some payers prefer reporting the code twice with modifiers RT (right) and LT (left). For the CPC exam, modifier 50 is the standard approach unless specified otherwise.

Conversion from Arthroscopic to Open

If a procedure begins arthroscopically but must be converted to an open approach (e.g., ACL reconstruction started arthroscopically but completed through an open incision), code only the open procedure — the arthroscopic portion is considered an approach component and is bundled. The exception is diagnostic arthroscopy that identifies a condition requiring a separate open procedure, which may be separately reportable with modifier 59.

Real-World Coding Examples

Example 1: Knee Meniscectomy with Chondroplasty

Operative Report: Arthroscopic partial medial meniscectomy of the right knee. Chondroplasty of the medial femoral condyle in the same compartment.

Correct Code: 29881 — Medial meniscectomy only. The chondroplasty in the same compartment is bundled per NCCI edits.

Example 2: Rotator Cuff Repair with Decompression

Operative Report: Right shoulder arthroscopy with subacromial decompression (acromioplasty) and repair of a full-thickness supraspinatus rotator cuff tear.

Correct Codes: 29827 + 29826-59 — Rotator cuff repair plus subacromial decompression. Modifier 59 on the decompression indicates it was a distinct service. Note: some payers bundle these, so verify payer policy.

Example 3: Total Knee Replacement, Bilateral

Operative Report: Bilateral total knee arthroplasty performed under single anesthetic.

Correct Code: 27447-50 — Total knee arthroplasty with modifier 50 for bilateral procedure.

CPC Exam Tips for Joint Procedure Coding

• Diagnostic arthroscopy is bundled into surgical arthroscopy of the same joint — never report both.
• Meniscectomy vs. repair: Read the operative report carefully for removal vs. suturing language.
• Count the compartments: For knee meniscectomy, determine medial only, lateral only, or both — this determines 29881 vs. 29880.
• Watch for bundled debridement: Chondroplasty and debridement in the same compartment as a more definitive procedure are usually bundled.
• Know the conversion rule: Arthroscopic-to-open conversion = code the open procedure only (with exceptions for separate diagnostic arthroscopy).
• Bilateral modifier: Use modifier 50 for bilateral joint procedures performed in the same session.
• Primary vs. revision arthroplasty: Revision codes are separate from primary codes and reflect greater complexity.

Summary

Joint procedure and arthroscopy coding requires you to identify the joint (knee, shoulder, hip), the approach (arthroscopic vs. open), and the specific procedure performed. For arthroscopy, always remember that diagnostic arthroscopy is bundled into surgical arthroscopy. Pay close attention to meniscectomy vs. repair language, compartment counts for knee procedures, and bundling rules for commonly combined procedures. For total joint replacement, distinguish between primary and revision procedures. Master these concepts and you will handle joint procedure coding questions confidently on the CPC exam.