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Official Description

Arthroscopy, metacarpophalangeal joint, diagnostic, includes synovial biopsy

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Diagnostic arthroscopy of the metacarpophalangeal (MP) joint is a minimally invasive surgical procedure that allows for direct visualization and assessment of the joint's internal structures. This procedure is particularly useful for evaluating conditions affecting the MP joint, such as synovial inflammation or damage. During the arthroscopy, small incisions, known as portals, are made on the dorsal (back) side of the hand, specifically at the ulnar and radial aspects of the MP joint, which are located next to the extensor muscle tendon sheath. Care is taken to avoid injury to the dorsal venous plexus, a network of veins in the area. To facilitate the procedure, the portals are infiltrated with a local anesthetic, such as lidocaine, and the joint is distended with saline solution to improve visibility. Finger traction is applied to the digit being examined, which helps to further open the joint space. A needle arthroscope, a specialized instrument equipped with a camera, is then introduced into the MP joint. This allows the physician to inspect the joint cartilage and assess the extent of any synovial inflammation present. If necessary, microforceps are utilized to obtain synovial tissue samples from the most inflamed areas of the synovium. These samples are crucial for laboratory analysis, aiding in the diagnosis of conditions such as rheumatoid arthritis. The overall goal of this diagnostic procedure is to provide early detection and intervention for joint diseases, thereby improving patient outcomes.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Diagnostic arthroscopy of the metacarpophalangeal (MP) joint is indicated for various conditions that may affect the joint's health and function. The following are the explicitly provided indications for this procedure:

  • Rheumatoid Arthritis - This procedure is commonly performed for the early detection of rheumatoid arthritis, a chronic inflammatory disorder that can lead to joint damage.
  • Joint Pain - Patients experiencing unexplained joint pain may undergo this procedure to identify underlying causes.
  • Synovial Inflammation - The procedure is indicated for assessing the extent of synovial inflammation, which can be a sign of various joint disorders.
  • Joint Swelling - Persistent swelling in the MP joint may warrant diagnostic arthroscopy to determine the cause.

2. Procedure

The procedure of diagnostic arthroscopy of the metacarpophalangeal (MP) joint involves several key steps that ensure effective evaluation and sampling of the joint's internal structures. The following procedural steps are outlined:

  • Step 1: Portal Incision - The procedure begins with the creation of small incisions, known as portals, over the MP joint. These incisions are strategically placed on the dorsal-ulnar and dorsal-radial aspects of the joint, adjacent to the extensor muscle tendon sheath. This positioning is crucial to minimize trauma to surrounding tissues, particularly the dorsal venous plexus.
  • Step 2: Joint Preparation - After the portals are established, they are infiltrated with a local anesthetic, such as lidocaine, to ensure patient comfort during the procedure. Following this, the joint is filled with saline solution to distend it, which enhances visibility of the internal structures.
  • Step 3: Application of Finger Traction - To facilitate access to the joint, finger traction is applied to the digit being examined. This technique helps to further open the joint space, allowing for better visualization and manipulation of the arthroscope.
  • Step 4: Introduction of the Arthroscope - A needle arthroscope is then introduced into the MP joint through one of the portals. This instrument is equipped with a camera that provides real-time visualization of the joint's interior, allowing the physician to inspect the cartilage and synovial tissue.
  • Step 5: Inspection and Biopsy - The physician carefully inspects the joint cartilage and evaluates the extent of any synovial inflammation. If necessary, microforceps are introduced through the arthroscope to obtain synovial tissue samples from the most inflamed areas of the synovium. These samples are critical for laboratory analysis and diagnosis.

3. Post-Procedure

After the completion of the diagnostic arthroscopy, patients may experience some discomfort and swelling in the affected area. Post-procedure care typically includes recommendations for rest and elevation of the hand to reduce swelling. Ice packs may be applied to alleviate pain and inflammation. Patients are usually advised to avoid strenuous activities involving the hand for a specified period to allow for proper healing. Follow-up appointments may be scheduled to discuss the results of the synovial biopsy and any further treatment options based on the findings.

Short Descr MCP JOINT ARTHROSCOPY DX
Medium Descr ARTHROSCOPY METACARPOPHALANGEAL SYNOVIAL BIOPSY
Long Descr Arthroscopy, metacarpophalangeal joint, diagnostic, includes synovial biopsy
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple 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.
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) P5B - Ambulatory procedures - musculoskeletal
MUE 2
CCS Clinical Classification 149 - Arthroscopy
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).
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.
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
Date
Action
Notes
2011-01-01 Changed Short description changed.
2002-01-01 Added First appearance in code book in 2002.
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