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Official Description

Reconstruction (advancement), posterior tibial tendon with excision of accessory tarsal navicular bone (eg, Kidner type procedure)

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 28238 involves the surgical reconstruction of the posterior tibial tendon, specifically through an advancement technique, which is performed in conjunction with the excision of an accessory tarsal navicular bone. The accessory navicular bone is an additional bone located on the medial side of the foot, proximal to the navicular bone, and is present in some individuals. This anatomical variation can lead to complications, particularly when the tibialis posterior tendon, which typically inserts on the navicular bone, becomes displaced due to the presence of the accessory bone. Such displacement can result in a valgus deformity of the foot, where the foot deviates outward. Furthermore, the accessory navicular bone may become enlarged or sustain injury, leading to pain during ambulation. Surgical intervention is indicated when conservative treatments fail to alleviate the pain associated with the accessory navicular bone. The surgical approach involves making a skin incision over the medial aspect of the foot, allowing for direct access to the tendon and the accessory bone, facilitating their excision and subsequent reconstruction of the tendon to restore proper foot mechanics.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure described by CPT® Code 28238 is indicated for individuals experiencing pain and functional impairment due to the presence of an accessory navicular bone. The following conditions may warrant this surgical intervention:

  • Painful Accessory Navicular Bone The accessory navicular bone may become symptomatic, causing pain during activities such as walking or standing.
  • Tendon Displacement The tibialis posterior tendon may be displaced due to the presence of the accessory navicular bone, leading to a valgus deformity of the foot.
  • Enlargement or Injury The accessory navicular bone may become enlarged or sustain injury, resulting in discomfort and necessitating surgical treatment.

2. Procedure

The surgical procedure for CPT® Code 28238 involves several key steps, each critical to the successful outcome of the intervention:

  • Step 1: Incision A skin incision is made over the medial side of the foot, specifically dorsal to the navicular prominence. This incision is carefully extended from the first cuneiform to the sustentaculum tali, providing adequate exposure to the underlying structures.
  • Step 2: Exposure of the Tendon Once the incision is made, the tibialis posterior tendon is exposed. The surgeon meticulously strips the tendon away from the accessory navicular bone, ensuring that a small piece of bone remains attached to the tendon for later reattachment.
  • Step 3: Excision of the Accessory Navicular Bone The entire accessory navicular bone is excised during this step. Additionally, any prominent portion of the navicular bone is also removed to alleviate pressure and pain.
  • Step 4: Reattachment of the Tendon After the excision, the tibialis posterior tendon is reattached to the plantar surface of the navicular bone. This is accomplished by suturing the small piece of bone that was left attached to the tendon back to the navicular bone, restoring the tendon’s function and alignment.
  • Step 5: Closure Finally, the incision is closed in layers to ensure proper healing and minimize scarring.

3. Post-Procedure

Post-procedure care following the reconstruction of the posterior tibial tendon and excision of the accessory navicular bone is essential for optimal recovery. Patients can expect to follow specific guidelines, including rest and elevation of the foot to reduce swelling. Pain management may be necessary, and the use of a splint or cast may be recommended to immobilize the foot during the initial healing phase. Physical therapy may be initiated after a period of rest to restore strength and mobility to the foot. Regular follow-up appointments will be necessary to monitor the healing process and ensure that the tendon is functioning correctly.

Short Descr REVISION OF FOOT TENDON
Medium Descr RCNSTJ PST TIBL TDN W/EXC ACCESSORY TARSL NAVCLR
Long Descr Reconstruction (advancement), posterior tibial tendon with excision of accessory tarsal navicular bone (eg, Kidner type procedure)
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 160 - Other therapeutic procedures on muscles and tendons
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.
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).
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.
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.
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).
81 Minimum assistant surgeon: minimum surgical assistant services are identified by adding modifier 81 to the usual procedure number.
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
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
CR Catastrophe/disaster related
GC This service has been performed in part by a resident under the direction of a teaching physician
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)
SG Ambulatory surgical center (asc) facility service
T3 Left foot, fourth digit
T6 Right foot, second digit
T7 Right foot, third digit
T8 Right foot, fourth digit
TA Left foot, great toe
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
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
2002-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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