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Official Description

Muscle, myocutaneous, or fasciocutaneous flap; lower extremity

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 15738 involves the use of a muscle, myocutaneous, or fasciocutaneous flap specifically for the lower extremity. This surgical technique is employed to repair defects in the lower leg or foot area, where tissue loss may have occurred due to trauma, surgery, or other medical conditions. The flap is created by harvesting a section of muscle along with its associated skin and fascia from a donor site, which is typically located in the same lower extremity. Once the flap is prepared, it is rotated into position to cover the defect, ensuring that the vascular supply is maintained to promote healing. The surgeon then sutures the flap securely in place, and the donor site is closed, either with sutures or, if necessary, a separate skin graft. It is important to note that if a skin graft is required to close the donor site, this procedure should be reported separately using the appropriate CPT® code. This technique is critical in reconstructive surgery, as it helps restore both function and aesthetics to the affected area.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure utilizing CPT® Code 15738 is indicated for various conditions that result in tissue defects in the lower extremity. These indications may include:

  • Traumatic Injury: Significant tissue loss due to accidents or injuries that compromise the integrity of the lower leg or foot.
  • Post-Surgical Defects: Areas where tissue has been removed during surgical procedures, necessitating reconstruction to restore normal anatomy and function.
  • Chronic Wounds: Non-healing ulcers or wounds that require advanced reconstructive techniques to promote healing and prevent further complications.
  • Congenital Defects: Birth defects that affect the structure of the lower extremity, requiring surgical intervention for correction.

2. Procedure

The procedure for CPT® Code 15738 involves several critical steps to ensure successful reconstruction of the lower extremity defect. These steps include:

  • Step 1: Donor Site Preparation The surgeon identifies and prepares the donor site from which the muscle, myocutaneous, or fasciocutaneous flap will be harvested. This site is typically located in the same lower extremity and is selected based on the vascular supply and the size of the defect that needs to be covered.
  • Step 2: Flap Harvesting The surgeon carefully dissects the flap, ensuring that the underlying blood vessels are preserved to maintain the flap's viability. The flap consists of muscle tissue, skin, and fascia, which are essential for effective coverage of the defect.
  • Step 3: Flap Rotation Once the flap is harvested, it is rotated into position over the defect. This step is crucial as it allows the flap to be sutured securely while ensuring that the blood supply remains intact, facilitating proper healing.
  • Step 4: Suturing the Flap The surgeon sutures the flap into place, ensuring that it adequately covers the defect and is securely anchored to the surrounding tissue. This step is vital for the stability and success of the reconstruction.
  • Step 5: Donor Site Closure After the flap has been positioned and sutured, the donor site is closed. This may involve suturing the skin edges together or, if necessary, applying a skin graft to cover the donor site adequately. If a skin graft is utilized, it should be reported separately using the appropriate CPT® code.

3. Post-Procedure

Post-procedure care following the flap surgery is essential for optimal recovery and includes monitoring the flap for signs of viability, such as color, temperature, and capillary refill. Patients may be advised to limit movement in the affected area to promote healing and prevent complications. Pain management and wound care instructions will be provided to ensure proper recovery. Follow-up appointments are necessary to assess the healing process and to address any concerns that may arise during the recovery period. Additionally, rehabilitation may be recommended to restore function and mobility in the lower extremity.

Short Descr MUSCLE-SKIN GRAFT LEG
Medium Descr MUSC MYOCUTANEOUS/FASCIOCUTANEOUS FLAP LXTR
Long Descr Muscle, myocutaneous, or fasciocutaneous flap; lower extremity
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) 0 - 150% payment adjustment for bilateral procedures does NOT apply.
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 Procedure or Service, Multiple Reduction Applies
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) P5A - Ambulatory procedures - skin
MUE 3
CCS Clinical Classification 172 - Skin graft

This is a primary code that can be used with these additional add-on codes.

20701 Add-on Code MPFS Status: Active Code APC N Removal of drug-delivery device(s), deep (eg, subfascial) (List separately in addition to code for primary procedure)
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.)
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).
GC This service has been performed in part by a resident under the direction of a teaching physician
XU Unusual non-overlapping service, the use of a service that is distinct because it does not overlap usual components of the main service
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.
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
LT Left side (used to identify procedures performed on the left side of the body)
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).
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).
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.
SG Ambulatory surgical center (asc) facility service
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.
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).
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.
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.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
AI Principal physician of record
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
GA Waiver of liability statement issued as required by payer policy, individual case
GW Service not related to the hospice patient's terminal condition
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
T5 Right foot, great toe
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
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2011-01-01 Changed Short description changed.
1990-01-01 Added First appearance in code book in 1990.
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