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Official Description

Arthroplasty, intercarpal or carpometacarpal joints; interposition (eg, tendon)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Arthroplasty, specifically for the intercarpal or carpometacarpal joints, involves a surgical procedure aimed at alleviating pain and restoring function in these joints, particularly in cases of arthritis. This procedure utilizes interposition techniques, where local tendon tissue is placed between the bones to provide cushioning and support. The most common application of this procedure is in the treatment of arthritis affecting the thumb, particularly at the carpometacarpal joint where the first metacarpal meets the trapezium bone. The surgery is designed to relieve pain and improve mobility by removing damaged bone and cartilage, and replacing it with tendon tissue, which helps to stabilize the joint and reduce friction during movement. The surgical approach requires careful dissection to avoid damaging surrounding structures, such as the radial nerve and artery, and involves specific steps to ensure the successful removal of the trapezium and proper placement of the tendon. Overall, this procedure is a critical intervention for patients suffering from debilitating joint pain due to arthritis, aiming to enhance their quality of life through improved hand function.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Arthroplasty of the intercarpal or carpometacarpal joints is indicated for the following conditions:

  • Painful Arthritis - This procedure is primarily performed to treat painful arthritis, particularly in the thumb, where the carpometacarpal joint is affected.
  • Joint Dysfunction - Patients experiencing significant joint dysfunction due to degenerative changes may benefit from this surgical intervention.
  • Loss of Range of Motion - Individuals with a reduced range of motion in the affected joint may require this procedure to restore functionality.

2. Procedure

The procedure for arthroplasty of the intercarpal or carpometacarpal joints involves several detailed steps:

  • Incision and Dissection - An incision is made over the base of the first metacarpal and trapezium. The surgeon carefully dissects down to the joint capsule while ensuring the protection of the radial nerve and radial artery.
  • Opening the Joint Capsule - The joint capsule is opened, and the first carpometacarpal joint is incised. The periosteum of the trapezium is then elevated to allow access to the joint.
  • Dissection of the Triscaphe Joint - The dissection continues to open the triscaphe joint, which is located between the scaphoid, trapezium, and trapezoid bones, facilitating further access to the trapezium.
  • Removal of the Trapezium - Using osteotomes and a rongeur, the trapezium is removed in pieces while taking care to protect the flexor carpi radialis (FCR) tendon. Any bone spurs present are also removed during this step.
  • Exposure of the FCR Tendon - Incisions are made in the distal forearm to expose the FCR tendon, which is then split lengthwise. The proximal radial portion of the tendon is transected but remains attached at its insertion point.
  • Tendon Interposition - The FCR tendon is pulled into the open wound, rolled, and sutured to itself. It is then sutured deep in position within the trapeziectomy wound bed to provide support and cushioning.
  • Stabilization and Closure - A K-wire may be placed through the first metacarpal and into the second metacarpal to stabilize the joint before the wound is irrigated. The carpometacarpal capsule, periosteum, and scaphotrapezial capsule are repaired, followed by the application of a dressing and splint to protect the surgical site.

3. Post-Procedure

Post-procedure care involves monitoring the surgical site for any signs of infection and ensuring proper healing. Patients are typically advised to keep the hand elevated and may be prescribed pain management strategies. Rehabilitation exercises may be introduced gradually to restore range of motion and strength in the joint. Follow-up appointments are essential to assess recovery and determine when the patient can resume normal activities.

Short Descr ARTHRP NTRCRP/CRP/MTCR NTRPS
Medium Descr ARTHRP INTERCARPAL/CARP/MTCRPL JT INTERPOSITION
Long Descr Arthroplasty, intercarpal or carpometacarpal joints; interposition (eg, tendon)
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) 2 - Payment restriction for assistants at surgery does not apply to this procedure...
Co-Surgeons (62) 1 - Co-surgeons could be paid, though supporting documentation is required...
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) P3D - Major procedure, orthopedic - other
MUE 4
CCS Clinical Classification 154 - Arthroplasty other than hip or knee
RT Right side (used to identify procedures performed on the right side of the body)
LT Left side (used to identify procedures performed on the left side of the body)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
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).
SG Ambulatory surgical center (asc) facility service
FA Left hand, thumb
F5 Right hand, thumb
GC This service has been performed in part by a resident under the direction of a teaching physician
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
81 Minimum assistant surgeon: minimum surgical assistant services are identified by adding modifier 81 to the usual procedure number.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. note: this modifier should not be appended to designated "add-on" codes (see appendix d).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
55 Postoperative management only: when 1 physician or other qualified health care professional performed the postoperative management and another performed the surgical procedure, the postoperative component may be identified by adding modifier 55 to the usual procedure number.
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
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.
76 Repeat procedure or service by same physician or other qualified health care professional: it may be necessary to indicate that a procedure or service was repeated by the same physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 76 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
77 Repeat procedure by another physician or other qualified health care professional: it may be necessary to indicate that a basic procedure or service was repeated by another physician or other qualified health care professional subsequent to the original procedure or service. this circumstance may be reported by adding modifier 77 to the repeated procedure or service. note: this modifier should not be appended to an e/m service.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
AG Primary physician
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
CG Policy criteria applied
CR Catastrophe/disaster related
F1 Left hand, second digit
F2 Left hand, third digit
F4 Left hand, fifth digit
F6 Right hand, second digit
F7 Right hand, third digit
F8 Right hand, fourth digit
F9 Right hand, fifth digit
GA Waiver of liability statement issued as required by payer policy, individual case
GW Service not related to the hospice patient's terminal condition
SA Nurse practitioner rendering service in collaboration with a physician
T5 Right foot, great toe
T8 Right foot, fourth digit
TA Left foot, great toe
TU Special payment rate, overtime
X4 Episodic/focused services: for reporting services by clinicians who provide focused care on particular types of treatment limited to a defined period and circumstance; the patient has a problem, acute or chronic, that will be treated with surgery, radiation, or some other type of generally time-limited intervention; reporting clinician service examples include but are not limited to, the orthopedic surgeon performing a knee replacement and seeing the patient through the postoperative period
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
Date
Action
Notes
2025-01-01 Changed Short, Medium, and Long Descriptions changed.
Pre-1990 Added Code added.
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