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Official Description

Injection(s), bone-substitute material (eg, calcium phosphate) into subchondral bone defect (ie, bone marrow lesion, bone bruise, stress injury, microtrabecular fracture), including imaging guidance and arthroscopic assistance for joint visualization

© Copyright 2025 American Medical Association. All rights reserved.

Common Language Description

The procedure described by CPT® Code 0707T involves the injection of bone-substitute material (BSM), such as calcium phosphate, into a subchondral bone defect. This type of defect may arise from various conditions, including bone marrow lesions, bone bruises, stress injuries, or microtrabecular fractures. The primary goal of this procedure, commonly referred to as subchondroplasty, is to alleviate joint pain associated with these defects by restoring structural integrity to the affected area. The calcium phosphate material used in this procedure is specially formulated to flow easily into the defect, where it subsequently crystallizes to form a solid structure that mimics the properties of healthy cancellous bone. Over time, the BSM is gradually resorbed and replaced by new bone as the healing process occurs. This minimally invasive procedure employs imaging guidance, typically fluoroscopy, along with arthroscopic assistance to visualize the joint and ensure accurate placement of the material. It is applicable to various joints, including the shoulder, hip, knee, foot, and ankle, depending on the specific location and type of defect being treated. Pre-operative imaging, such as MRI, is utilized to identify the defect and determine the optimal entry point for the cannula, which is essential for the successful execution of the procedure.

© Copyright 2025 Coding Ahead. All rights reserved.

1. Indications

The injection of bone-substitute material into subchondral bone defects is indicated for the following conditions:

  • Bone Marrow Lesion A localized area of edema or inflammation within the bone marrow, often associated with pain and dysfunction in the affected joint.
  • Bone Bruise A type of injury characterized by bleeding and swelling within the bone, typically resulting from trauma or stress.
  • Stress Injury A condition resulting from repetitive stress on the bone, leading to microdamage and pain, often seen in athletes.
  • Microtrabecular Fracture Small fractures within the trabecular bone that can cause pain and may not be visible on standard imaging.

2. Procedure

The procedure for injecting bone-substitute material into a subchondral bone defect involves several detailed steps to ensure accuracy and effectiveness:

  • Step 1: Pre-operative Imaging Prior to the procedure, MRI is utilized to locate the defect and determine the optimal entry point for the cannula. This imaging is crucial for planning the approach and ensuring precise targeting of the defect.
  • Step 2: Patient Positioning For knee procedures, the patient is positioned supine, with the leg elevated to facilitate unobstructed lateral fluoroscopy. This positioning is essential for accurately localizing the cannula entry point and trajectory relative to the MRI landmarks.
  • Step 3: Marking Landmarks The joint line and other anatomical landmarks are identified and marked on the skin to guide the procedure. This step helps in triangulating the bony defect accurately.
  • Step 4: Insertion of Spinal Needle Under arthroscopic visualization, a spinal needle may be inserted to assist in triangulating the defect. The tip of the needle is positioned to provide a reference point for the subsequent steps.
  • Step 5: Cannula Placement The cannula is connected to a wire driver and positioned at the entry site under fluoroscopic guidance. The drill is then tilted to center the cannula in the C-arm x-ray beam, allowing for precise drilling through the cortex into the cancellous bone.
  • Step 6: Drilling to Desired Depth The surgeon drills through the cortex and into the cancellous bone, disconnects the drill, and takes additional images to confirm the height and trajectory before continuing to drill to the desired depth.
  • Step 7: Preparation of Bone-Substitute Material The bone-substitute material is mixed in a prefilled mixing and transfer syringe. This preparation is critical to ensure that the material is ready for injection.
  • Step 8: Injection of Material With the cannula directed toward the defect, the inner stylus is removed, and the syringe containing the mixed BSM is attached. The material is injected into the defect using steady manual pressure to fill the desired volume.
  • Step 9: Verification and Extravasation Check While the cannula remains in place, the arthroscope is used to check for any extravasation of the material. If any leakage is observed, it is addressed immediately.
  • Step 10: Removal of Cannula The cannula is removed by reconnecting the driver and using the drill in reverse mode. Finally, imaging is performed to confirm the proper placement of the injected material within the defect.

3. Post-Procedure

After the injection of bone-substitute material, patients may require monitoring for any immediate complications, such as infection or excessive swelling. The expected recovery process typically involves a gradual return to normal activities, with specific rehabilitation protocols tailored to the joint treated. Patients are often advised to follow up with their healthcare provider to assess the effectiveness of the procedure and to monitor the healing process. Additional imaging may be performed at follow-up visits to evaluate the integration of the bone-substitute material and the healing of the defect.

Short Descr NJX B1 SUB MTRL SBCHDRL DFCT
Medium Descr NJX BONE SUB MATRL INTO SUBCHONDRAL BONE DEFECT
Long Descr Injection(s), bone-substitute material (eg, calcium phosphate) into subchondral bone defect (ie, bone marrow lesion, bone bruise, stress injury, microtrabecular fracture), including imaging guidance and arthroscopic assistance for joint visualization
Status Code Carriers Price the Code
Global Days YYY - Carrier Determines Whether Global Concept Applies
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) 1 - Statutory payment restriction for assistants at surgery applies 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 Device-intensive procedure added to ASC list in CY 2008 or later; paid at adjusted rate.
Berenson-Eggers TOS (BETOS) none
MUE 1
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.
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).
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
GA Waiver of liability statement issued as required by payer policy, individual case
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)
SG Ambulatory surgical center (asc) facility service
XS Separate structure, a service that is distinct because it was performed on a separate organ/structure
Date
Action
Notes
2022-01-01 Added Code added
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Description
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