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Official Description

Amputation, leg, through tibia and fibula;

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Amputation through the tibia and fibula, commonly known as a below knee (BK) amputation, is a surgical procedure that involves the removal of the leg below the knee joint. This procedure is one of the most frequently performed major limb amputations and is typically indicated in cases where the leg is severely damaged due to trauma, infection, or vascular disease. The surgical technique involves careful planning and execution to ensure that the remaining limb is suitable for prosthetic fitting post-operation. The procedure begins with marking incision lines on the skin, followed by the incision of the skin and underlying soft tissues. Surgeons meticulously dissect down to the muscle, identifying and isolating muscle compartments, as well as neurovascular structures, which include various nerves and blood vessels. This careful dissection is crucial to prevent nerve damage and ensure proper healing. The procedure culminates in the resection of the bones, followed by the creation of muscle and skin flaps to cover the amputation site, ultimately preparing the patient for prosthetic rehabilitation.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure of amputation through the tibia and fibula is indicated in several clinical scenarios, primarily when the leg is compromised beyond repair. The following conditions may warrant this surgical intervention:

  • Severe Trauma: Significant injuries to the leg that cannot be salvaged, such as those resulting from accidents or severe fractures.
  • Infection: Uncontrolled infections in the leg that pose a risk to the patient's health and cannot be managed through conservative treatment.
  • Vascular Disease: Conditions such as peripheral artery disease that lead to critical limb ischemia, resulting in tissue death and necessitating amputation.
  • Malignancy: Tumors located in the leg that require removal to prevent the spread of cancer or to alleviate pain.

2. Procedure

The procedure for amputation through the tibia and fibula involves several critical steps to ensure a successful outcome. Each step is performed with precision to minimize complications and facilitate healing:

  • Step 1: Marking the Incision Lines The surgeon begins by marking the incision lines on the skin, which delineate the area of amputation. This step is crucial for planning the surgical approach and ensuring that sufficient healthy tissue remains for prosthetic fitting.
  • Step 2: Incision of Skin and Soft Tissues Following the marking, the surgeon incises the skin and underlying soft tissues, carefully dissecting down to the muscle layers. This dissection is performed with attention to detail to preserve surrounding structures.
  • Step 3: Identification of Muscle Compartments The surgeon identifies and isolates the muscle compartments, which are then divided to access the neurovascular structures. This step is essential for ensuring that nerves and blood vessels are handled appropriately during the procedure.
  • Step 4: Isolation of Neurovascular Structures Key neurovascular structures, including the tibial nerve, artery, and vein, as well as the peroneal nerves and vessels, are identified. Care is taken to separate nerves from arteries to prevent irritation and damage.
  • Step 5: Transection of Nerves The nerves are transected as high as possible, allowing them to retract into the surrounding soft tissues. This step helps to minimize phantom pain and other complications post-surgery.
  • Step 6: Incision of Periosteum The periosteum of the tibia and fibula is incised, and lateral and medial osteoperiosteal flaps are elevated. This step prepares the bone for resection.
  • Step 7: Resection of Bone The surgeon then resects the bone, ensuring that the ends are shaped appropriately for closure.
  • Step 8: Suturing of Flaps The medial tibial flap is sutured to the lateral fibular flap, and the lateral tibial flap is sutured to the medial fibular flap, creating a bridge that covers the ends of the bones.
  • Step 9: Configuration of Muscle Flaps Mobilized muscles are configured into flaps and brought over the ends of the tibia and fibula. Opposing muscles are sutured together to promote healing and stability.
  • Step 10: Fashioning and Suturing of Skin Flaps Finally, skin flaps are fashioned and sutured over the muscle, completing the closure of the surgical site. This step is vital for protecting the underlying structures and facilitating healing.

3. Post-Procedure

After the amputation procedure, the patient will require careful post-operative care to promote healing and prepare for rehabilitation. The surgical site is typically wrapped in an elastic bandage or placed in a plaster splint to support the area and reduce swelling. Following adequate wound healing, the patient will be fitted for a prosthesis to restore mobility. If a cast of the stump is obtained during the procedure, the patient may be fitted for a prosthesis immediately. Regular follow-up appointments are essential to monitor healing, manage any complications, and adjust the prosthetic fitting as needed.

Short Descr AMPUTATION OF LOWER LEG
Medium Descr AMPUTATION LEG THROUGH TIBIA&FIBULA
Long Descr Amputation, leg, through tibia and fibula;
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 Inpatient Procedures, not paid under OPPS
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P3D - Major procedure, orthopedic - other
MUE 1
CCS Clinical Classification 157 - Amputation of lower extremity
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)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GC This service has been performed in part by a resident under the direction of a teaching physician
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.
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.)
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).
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).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) 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).
54 Surgical care only: when 1 physician or other qualified health care professional performs a surgical procedure and another provides preoperative and/or postoperative management, surgical services may be identified by adding modifier 54 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.
62 Two surgeons: when 2 surgeons work together as primary surgeons performing distinct part(s) of a procedure, each surgeon should report his/her distinct operative work by adding modifier 62 to the procedure code and any associated add-on code(s) for that procedure as long as both surgeons continue to work together as primary surgeons. each surgeon should report the co-surgery once using the same procedure code. if additional procedure(s) (including add-on procedure(s) are performed during the same surgical session, separate code(s) may also be reported with modifier 62 added. note: if a co-surgeon acts as an assistant in the performance of additional procedure(s), other than those reported with the modifier 62, during the same surgical session, those services may be reported using separate procedure code(s) with modifier 80 or modifier 82 added, as appropriate.
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.
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).
AF Specialty physician
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)
CR Catastrophe/disaster related
ET Emergency services
GV Attending physician not employed or paid under arrangement by the patient's hospice provider
GW Service not related to the hospice patient's terminal condition
PT Colorectal cancer screening test; converted to diagnostic test or other procedure
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
Q6 Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
T1 Left foot, second digit
TA Left foot, great toe
X5 Diagnostic services requested by another clinician: for reporting services by a clinician who furnishes care to the patient only as requested by another clinician or subsequent and related services requested by another clinician; this modifier is reported for patient relationships that may not be adequately captured by the above alternative categories; reporting clinician service examples include but are not limited to, the radiologist's interpretation of an imaging study requested by another clinician
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
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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2010-01-01 Changed Code description changed.
Pre-1990 Added Code added.
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