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Official Description

Incision, bone cortex (eg, osteomyelitis or bone abscess), shoulder area

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

An incision of the bone cortex in the shoulder area is a surgical procedure performed to address conditions such as osteomyelitis, which is an infection of the bone, or a bone abscess, which is a localized collection of pus within the bone. The shoulder area encompasses several bones, including the clavicle, scapula, and the humeral head and neck. During this procedure, the surgeon makes an incision through the skin and soft tissue to reach the affected area. The periosteum, which is the dense layer of vascular connective tissue enveloping the bones, is carefully elevated to expose the underlying bone cortex. A small section, referred to as a button of cortical bone, is then removed to access the bone marrow beneath. If the procedure reveals the presence of pus, the surgeon may enlarge the incision using specialized instruments such as a chisel or gouge, allowing for further drainage along the bone surface. In cases where the epiphysis, the end part of a long bone, is involved, a portion of the epiphyseal cortex may also be excised to ensure complete drainage of the abscess. This procedure is critical for treating infections and preventing further complications associated with bone diseases.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The procedure is indicated for the following conditions:

  • Osteomyelitis A serious infection of the bone that can lead to bone destruction and necrosis if not treated promptly.
  • Bone Abscess A localized collection of pus within the bone, often resulting from infection, which requires drainage to alleviate pain and prevent further complications.

2. Procedure

The procedure involves several critical steps to ensure effective treatment of the affected bone area.

  • Step 1: Incision The surgeon begins by making an incision in the skin over the shoulder area, carefully cutting through the soft tissue to reach the underlying bone. This initial incision is crucial for accessing the site of infection or abscess.
  • Step 2: Elevation of the Periosteum Once the incision is made, the surgeon elevates the periosteum, which is the protective layer surrounding the bone. This step is essential to expose the bone cortex directly over the lesion.
  • Step 3: Removal of Cortical Bone A button of cortical bone is then removed to gain access to the bone marrow. This removal is necessary to treat the infection effectively and allows for better drainage of any pus present.
  • Step 4: Enlargement of the Incision If pus is encountered during the procedure, the surgeon may choose to enlarge the button hole. This is done using a chisel or gouge, extending the incision along the bone for one to two inches to facilitate thorough drainage.
  • Step 5: Removal of Epiphyseal Cortex (if necessary) In cases where the epiphysis is involved, a section of the epiphyseal cortex may be excised. This step ensures that the infection is fully addressed and prevents recurrence.
  • Step 6: Drainage of the Bone Abscess Finally, the bone abscess is drained, which is a critical step in alleviating symptoms and promoting healing. Proper drainage helps to remove infected material and reduces the risk of further complications.

3. Post-Procedure

After the procedure, appropriate post-operative care is essential for recovery. The patient may require monitoring for signs of infection or complications. Pain management strategies will be implemented, and the surgical site will need to be kept clean and dry. Follow-up appointments will be necessary to assess healing and ensure that the infection has been adequately addressed. Depending on the extent of the procedure and the patient's overall health, rehabilitation may be recommended to restore function to the shoulder area.

Short Descr DRAIN SHOULDER BONE LESION
Medium Descr INCISION BONE CORTEX SHOULDER AREA
Long Descr Incision, bone cortex (eg, osteomyelitis or bone abscess), shoulder area
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) 0 - Co-surgeons not permitted for this procedure.
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) P5B - Ambulatory procedures - musculoskeletal
MUE 1
CCS Clinical Classification 161 - Other OR therapeutic procedures on bone

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

20700 Add-on Code MPFS Status: Active Code APC N ASC N1 Manual preparation and insertion of drug-delivery device(s), deep (eg, subfascial) (List separately in addition to code for primary procedure)
20702 Add-on Code MPFS Status: Active Code APC N Manual preparation and insertion of drug-delivery device(s), intramedullary (List separately in addition to code for primary procedure)
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).
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.
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.)
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).
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)
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
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
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