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Official Description

Patellectomy or hemipatellectomy

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

A patellectomy or hemipatellectomy is a surgical procedure involving the complete or partial removal of the patella, commonly known as the kneecap. This procedure is typically indicated for patients suffering from conditions such as non-healing injuries, recurrent dislocations, or severe arthritis affecting the patella, which can lead to significant pain and functional impairment. The patella plays a crucial role in knee mechanics, and its removal may be necessary to alleviate pain and restore mobility. During the procedure, a vertical incision is made over the patella, allowing the surgeon to access the underlying soft tissues. The surgeon carefully dissects these tissues to expose the patella for examination. If the decision is made to proceed with the removal, the muscle and tendon attachments to the patella are severed, enabling the complete or partial excision of the kneecap. In cases where only a portion of the patella is removed, the remaining part is smoothed using a motorized shaver to ensure proper healing and function. The quadriceps tendon and patellar tendon, which are essential for knee extension, are then reattached to the remaining patellar structure or sutured together if the patella is entirely excised. Finally, the soft tissues and skin are meticulously closed in layers to promote optimal recovery.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure of patellectomy or hemipatellectomy is indicated for several specific conditions that affect the patella and the overall function of the knee. These indications include:

  • Non-healing injury - This refers to injuries to the patella that do not heal properly, leading to persistent pain and dysfunction.
  • Repeated dislocation - Patients who experience multiple dislocations of the patella may require this procedure to stabilize the knee and prevent further dislocations.
  • Severe arthritis of the patella - In cases where arthritis causes significant pain and limits mobility, removal of the patella may be necessary to alleviate symptoms and improve quality of life.

2. Procedure

The procedure for patellectomy or hemipatellectomy involves several critical steps that ensure the effective removal of the patella while preserving knee function. The steps are as follows:

  • Step 1: Incision - A vertical skin incision is made directly over the patella to provide access to the underlying structures. This incision is carefully planned to minimize damage to surrounding tissues.
  • Step 2: Dissection - The surgeon dissects the soft tissues surrounding the patella to expose it fully. This step is crucial for a clear view of the patella and its attachments.
  • Step 3: Examination - Once exposed, the patella is examined to assess the extent of the injury or disease. This examination helps the surgeon determine whether a complete or partial removal is necessary.
  • Step 4: Severing Attachments - The muscle and tendon attachments to the patella are carefully severed. This step is essential for the removal of the patella without causing undue damage to the surrounding structures.
  • Step 5: Removal of the Patella - The surgeon then proceeds to remove all or part of the patella, depending on the specific condition being treated. If only a portion is removed, the remaining part is smoothed using a motorized shaver to facilitate healing.
  • Step 6: Reattachment of Tendons - After the patella is removed, the quadriceps tendon and patellar tendon are reattached to the remaining portion of the patella if it was only partially removed. If the patella is completely excised, these tendons are sutured together to maintain the ability to extend the knee.
  • Step 7: Closure - Finally, the overlying soft tissue and skin are closed in layers to promote healing and reduce the risk of complications.

3. Post-Procedure

Post-procedure care following a patellectomy or hemipatellectomy is essential for optimal recovery. Patients can expect to undergo a rehabilitation program that focuses on restoring knee function and strength. Pain management strategies will be implemented to address discomfort following surgery. The surgical site will be monitored for signs of infection or complications. Patients are typically advised to limit weight-bearing activities initially and may require the use of crutches or a knee brace during the early stages of recovery. Gradual progression to physical therapy will be encouraged to enhance mobility and strengthen the surrounding muscles. Follow-up appointments will be scheduled to assess healing and adjust rehabilitation protocols as necessary.

Short Descr REMOVAL OF KNEECAP
Medium Descr PATELLECTOMY/HEMIPATELLECTOMY
Long Descr Patellectomy or hemipatellectomy
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 1
CCS Clinical Classification 142 - Partial excision bone
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.
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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).
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)
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).
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.
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.
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.)
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.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
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).
CR Catastrophe/disaster related
GC This service has been performed in part by a resident under the direction of a teaching physician
SG Ambulatory surgical center (asc) facility service
XE Separate encounter, a service that is distinct because it occurred during a separate encounter
XP Separate practitioner, a service that is distinct because it was performed by a different practitioner
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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