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Official Description

Revision of total hip arthroplasty; femoral component only, with or without allograft

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

The CPT® Code 27138 refers to the procedure known as the revision of total hip arthroplasty, specifically focusing on the femoral component only, with or without the use of allograft. This surgical intervention is typically indicated when a previously implanted total hip prosthesis has failed, necessitating a revision to restore function and alleviate pain. The procedure involves a series of meticulous steps, beginning with the incision along the previous surgical site on the lateral aspect of the hip. Surgeons must carefully dissect the soft tissue, which may involve extensive release of scar tissue that has formed around the hip joint. This may include partial releases of the psoas tendon, gluteus maximus insertion, and the head of the rectus femoris muscle to gain adequate access to the hip joint. Once the hip is dislocated, the femoral head prosthesis is exposed for removal. The acetabular component is also addressed, requiring the excision of the pseudocapsule and removal of the acetabular cup. The femoral component's removal may involve techniques such as using a high-speed burr to eliminate any trochanteric overhang or performing a trochanteric osteotomy if necessary. The procedure also includes clearing the proximal femoral stem of any bone cement or bony overgrowth, which is crucial for the successful implantation of the new components. Depending on the condition of the existing prosthesis, the removal may require additional measures to sever any fibrous or bony ingrowth. After the old components are removed, the surgical site is thoroughly cleaned, and any bone loss is evaluated to determine the need for bone grafting. The final step involves the implantation of the revised femoral component, ensuring that the hip joint is restored to its intended function.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The procedure coded as CPT® 27138 is indicated for patients experiencing complications related to a previously implanted total hip arthroplasty. The specific indications for this revision procedure include:

  • Failed Total Hip Arthroplasty The primary indication for this procedure is the failure of the total hip prosthesis, which may manifest as pain, instability, or loss of function.
  • Prosthetic Loosening Loosening of the femoral component, which can occur due to wear, osteolysis, or inadequate fixation, necessitating revision.
  • Infection Presence of infection around the hip joint that may compromise the integrity of the existing prosthesis.
  • Bone Loss Significant bone loss in the femoral region that requires correction and stabilization through revision.

2. Procedure

The procedure for CPT® 27138 involves several critical steps to ensure the successful revision of the femoral component of the total hip arthroplasty. The steps are as follows:

  • Step 1: Incision and Dissection The surgeon begins by making an incision over the previous surgical site along the lateral aspect of the hip. This incision allows access to the underlying soft tissues, which are carefully dissected to expose the hip joint. Extensive soft tissue release may be necessary due to scar tissue formation, which can include partial releases of the psoas tendon, gluteus maximus insertion, and the head of the rectus femoris muscle.
  • Step 2: Dislocation of the Hip Once the soft tissues are adequately released, the hip joint is dislocated to provide access to the femoral head prosthesis. This step is crucial for the subsequent removal of the existing components.
  • Step 3: Removal of the Acetabular Component The acetabular component is removed by excising the entire pseudocapsule surrounding it. The acetabular cup is then extracted, which may require careful manipulation to avoid damaging surrounding structures.
  • Step 4: Removal of the Femoral Component The removal of the femoral component involves addressing any trochanteric overhang, which can be done using a high-speed burr. If necessary, a trochanteric osteotomy may be performed to facilitate access. The proximal aspect of the femoral stem is cleared of any visible bone cement or bony overgrowth to prepare for the new component.
  • Step 5: Extraction of the Femoral Component Depending on the type of prosthesis, the femoral component may be removed using traction. If there is significant fibrous or bony ingrowth, the surgeon may need to sever these connections using flexible osteotomies or a small burr. Once loosened, the femoral component is extracted.
  • Step 6: Cleaning the Surgical Site After the removal of the components, the surgical sites are thoroughly flushed with saline and/or an antibiotic solution to reduce the risk of infection.
  • Step 7: Evaluation and Grafting The acetabulum and femoral shaft are evaluated for any bone loss. If necessary, bone allografts and/or autografts are utilized to reconstitute the bone structure, ensuring a stable foundation for the new components.
  • Step 8: Implantation of Revised Components Finally, the physician makes the necessary revisions to the total hip components, and the revised femoral component is implanted, completing the procedure.

3. Post-Procedure

Post-procedure care following CPT® 27138 involves monitoring the patient for any signs of complications, such as infection or instability of the new components. Patients are typically advised on rehabilitation protocols, which may include physical therapy to restore mobility and strength in the hip joint. The recovery process may vary depending on the extent of the surgery and the patient's overall health. Regular follow-up appointments are essential to assess the healing process and the functionality of the revised hip components. Additionally, patients may be instructed to avoid certain activities that could stress the hip joint during the initial recovery phase.

Short Descr REVISE HIP JOINT REPLACEMENT
Medium Descr REVJ TOT HIP ARTHRP FEM ONLY W/WO ALGRFT
Long Descr Revision of total hip arthroplasty; femoral component only, with or without allograft
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) P3B - Major procedure, orthopedic - Hip replacement
MUE 1
CCS Clinical Classification 153 - Hip replacement, total and partial

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

20704 Add-on Code MPFS Status: Active Code APC N Manual preparation and insertion of drug-delivery device(s), intra-articular (List separately in addition to code for primary procedure)
20705 Add-on Code MPFS Status: Active Code APC N Removal of drug-delivery device(s), intra-articular (List separately in addition to code for primary procedure)
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)
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
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.)
GC This service has been performed in part by a resident under the direction of a teaching physician
81 Minimum assistant surgeon: minimum surgical assistant services are identified by adding modifier 81 to the usual procedure number.
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).
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.
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.
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.
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).
AG Primary physician
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CA Procedure payable only in the inpatient setting when performed emergently on an outpatient who expires prior to admission
CC Procedure code change (use 'cc' when the procedure code submitted was changed either for administrative reasons or because an incorrect code was filed)
ET Emergency services
GF Non-physician (e.g. nurse practitioner (np), certified registered nurse anesthetist (crna), certified registered nurse (crn), clinical nurse specialist (cns), physician assistant (pa)) services in a critical access hospital
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
GZ Item or service expected to be denied as not reasonable and necessary
KX Requirements specified in the medical policy have been met
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
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
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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