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Official Description

Decompression fasciotomy, thigh and/or knee, multiple compartments;

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

Decompression fasciotomy is a surgical procedure aimed at alleviating the pressure within muscle compartments, specifically in the thigh and/or knee regions, to treat a condition known as compartment syndrome. Compartment syndrome occurs when swelling within a muscle compartment leads to increased pressure, which can compress blood vessels and nerves, potentially resulting in severe complications such as permanent muscle and nerve damage. The muscle compartments are encased in fascia, a dense connective tissue that does not stretch, thereby limiting the space available for the muscles and other structures within. In the thigh and knee area, there are three primary compartments: the flexor compartment, the extensor compartment, and the adductor (medial) compartment. The procedure described by CPT® Code 27498 involves the decompression of multiple compartments, which is critical when the pressure within these compartments becomes dangerously elevated. The surgical approach typically includes making an incision over the lateral aspect of the thigh, allowing access to the affected compartments for evaluation and intervention. This procedure is essential for preventing irreversible damage to the muscles and nerves due to prolonged pressure, thereby preserving function and mobility in the affected limb.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

Decompression fasciotomy is indicated for the treatment of compartment syndrome, which may arise from various conditions leading to increased pressure within muscle compartments. The following are specific indications for performing this procedure:

  • Compartment Syndrome - A condition characterized by increased pressure within a muscle compartment, leading to compromised blood flow and potential nerve and muscle damage.
  • Swelling Due to Trauma - Trauma to the thigh or knee area that results in significant swelling and subsequent compartment syndrome.
  • Fractures - Fractures in the femur or knee region that may cause swelling and increased compartment pressures.
  • Vascular Compromise - Situations where blood flow is restricted due to swelling, necessitating intervention to restore circulation.

2. Procedure

The procedure for decompression fasciotomy involves several critical steps to ensure effective treatment of compartment syndrome. Each step is designed to relieve pressure and restore normal function within the affected compartments.

  • Step 1: Incision A skin incision is made over the lateral aspect of the thigh, starting just distal to the intertrochanteric line and extending to the lateral epicondyle. This incision provides access to the underlying structures.
  • Step 2: Dissection The subcutaneous tissue is carefully dissected to expose the iliotibial band, which is a thick band of connective tissue on the outer thigh.
  • Step 3: Iliotibial Band Incision The iliotibial band is incised in the direction of its fibers to allow further access to the muscle compartments.
  • Step 4: Reflection of Vastus Lateralis The vastus lateralis muscle is reflected off the lateral intermuscular septum, which is then opened both proximally and distally along the entire length of the incision.
  • Step 5: Pressure Check Pressures within the anterior and posterior compartments are assessed to determine the extent of compartment syndrome.
  • Step 6: Incision of Compartments If necessary, the anterior and/or posterior compartments are incised to relieve pressure. After this, compartment pressures are rechecked to confirm adequate decompression.
  • Step 7: Medial Compartment Assessment The medial compartment pressures are evaluated, and if elevated, a medial incision is made to decompress the adductor compartment.
  • Step 8: Hemostasis Any bleeding is controlled using electrocautery to minimize blood loss during the procedure.
  • Step 9: Inspection and Debridement In cases where CPT® Code 27499 is applicable, muscle tissue and nerves are inspected, and any nonviable tissue is debrided using sharp excision.
  • Step 10: Wound Management The skin and fascial incisions are left open and covered with a dressing. The patient is typically returned to the operating room for wound closure once the swelling subsides, usually within 24-72 hours.

3. Post-Procedure

After the decompression fasciotomy, the patient will require careful monitoring and management. The incisions are left open to allow for swelling to decrease, and they are covered with a dressing to protect the area. The patient is expected to be returned to the operating room for closure of the incisions once the swelling has subsided, which typically occurs within 24 to 72 hours post-surgery. During this recovery period, it is crucial to monitor for any signs of infection, further swelling, or complications related to the procedure. Rehabilitation and physical therapy may be initiated as part of the recovery process to restore function and strength in the affected limb.

Short Descr DECOMPRESSION OF THIGH/KNEE
Medium Descr DCMPRN FASCIOTOMY THIGH&/KNEE MLT COMPARTMENTS
Long Descr Decompression fasciotomy, thigh and/or knee, multiple compartments;
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) 2 - Co-surgeons permitted and no documentation required if the two- specialty requirement is met.
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
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).
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.
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.
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.)
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).
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
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)
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
2010-01-01 Changed Code description changed.
1993-01-01 Added First appearance in code book in 1993.
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