0SGC45Z
Fusion Knee Joint, Right to No Qualifier with External Fixation Device, Percutaneous Endoscopic Approach
Procedural Specifications
| Clinical Axis | Detail Definition |
|---|---|
| Section | 0 Medical and Surgical |
| Body System | S Lower Joints |
| Operation | G Fusion |
| Body Part | C Knee Joint, Right |
| Approach | 4 Percutaneous Endoscopic |
| Device | 5 External Fixation Device |
| Qualifier | Z No Qualifier |
Operation Definition
Joining together portions of an articular body part rendering the articular body part immobile
Procedure Overview
Fusion, also called arthrodesis, permanently joins the bones of a lower joint so that the joint can no longer move, converting a painful or unstable joint into a solid, stable one. It is used on the hip, knee, ankle, foot, and lumbar or lumbosacral spinal joints for conditions like severe arthritis, joint instability, failed prior surgery, deformity correction, or chronic pain that has not responded to less invasive treatment. Hardware such as screws, plates, or rods, sometimes combined with a bone graft, holds the joint surfaces together while they grow into one continuous piece of bone.
Because fusion eliminates motion at the treated joint, it is generally considered after other options such as medication, injections, or partial procedures have failed to control symptoms. Spinal fusion in the lumbar region is one of the most common examples, performed for conditions like degenerative disc disease, spondylolisthesis, or spinal instability.
Recovery typically takes several months as the bone heals across the joint, and patients can expect a trade of joint mobility for pain relief and structural stability.
Anatomy & Axis Detail
Knee Joint, Right
The right knee joint, formed by the femur, tibia, and patella, is fused, knee arthrodesis, most often as a limb-salvage procedure after failed total knee arthroplasty complicated by infection, severe bone loss, or extensor mechanism disruption where a repeat replacement is not viable. The procedure obliterates the tibiofemoral articulation to create a stable, pain-free, weight-bearing limb, typically secured with a long intramedullary rod spanning the femur and tibia or with external fixation when infection risk precludes internal hardware. Because the knee normally provides substantial flexion needed for sitting and stair use, arthrodesis significantly alters gait and functional independence, making it a decision of last resort. Coding must specify the fixation device and, when bone loss is substantial, any structural allograft or bone graft substitute placed to bridge the defect.
Approach: Percutaneous Endoscopic
Percutaneous Endoscopic combines a puncture through skin or mucous membrane with insertion of an endoscope to visualize the procedure internally, as in laparoscopic cholecystectomy. It is distinguished from plain Percutaneous by the presence of scope-guided visualization, and from Via Natural or Artificial Opening Endoscopic by its route being a new puncture rather than an existing orifice or stoma.
Device: External Fixation Device
This is the general external fixation device value, used when pins or wires anchored in bone are connected to a stabilizing frame outside the body to hold a fracture or joint in position, without specifying a more particular frame configuration. It contrasts with the more specific External Fixation Device subtypes - Monoplanar, Ring, Hybrid, and Limb Lengthening - which describe the frame's geometry or added lengthening function.
Coding & Documentation
Coders need documentation confirming that articular surfaces were joined with the intent of eliminating motion, along with the device used (bone graft substitute, autograft, nonautograft, or internal fixation) and, for spinal fusion, the number of vertebral joints involved, since each level typically requires its own code. A frequent error is under-coding multilevel spinal fusions by capturing only one joint level instead of each level fused. Another common mistake is confusing the qualifier for graft material, since autologous bone graft, synthetic substitute, and no-graft fixation all carry different qualifier values that materially change the code. Coders should also check whether an anterior and posterior approach were both performed at the same spinal level, which requires separate codes for each approach.