COSC key terms

The long middle shaft of a long bone, made of thick cortical bone. Fractures in this region are described by level and pattern because those details affect treatment and code selection.

The growth plate near each end of a child's long bone, where cartilage turns into new bone. Injuries here are classified separately because they can disturb future growth and require special coding.

A surgical cut through bone, usually planned to correct alignment, length, or joint mechanics. The surgeon divides, reshapes, and then stabilizes the bone, often with plates or screws.

The surgeon's formal narrative of a procedure, covering indications, findings, technique, implants, specimens, and estimated blood loss. Coders rely on it to assign codes and support medical necessity.

A fracture that breaks the bone into three or more pieces. The extra fragments make reduction harder and often point to more complex treatment and higher-level coding.

A single CPT code covering the complete nonoperative or operative management of a fracture, including initial treatment and routine follow-up care during the healing period.

Treating a fracture by hand without opening the skin, moving the bone ends back into position, then holding them with a cast or splint. Records must show the manipulation was necessary.

Stabilizing a fracture with pins or screws placed through small skin punctures, usually under imaging guidance, without opening the fracture site. It may be coded separately from the reduction when rules permit.

A frame of pins or wires anchored in bone and connected outside the skin to hold a fracture or reconstructed bone in place while it heals.

Putting a dislocated joint back into normal position without surgery. Coding depends on the joint involved, whether anesthesia was used, and whether a fracture was also treated.

Surgical cleaning of an open fracture wound, including removal of foreign material and dead tissue, coded by the depth and extent of tissue layers involved.

A procedure using a small camera and instruments through tiny incisions to view and treat structures inside a joint. Coders must know which procedures were performed and which joint was entered.

When a surgeon performs an arthroscopic operation, the initial look around the joint is considered part of that surgical service and is not reported separately.

Arthroscopic smoothing or shaving of damaged articular cartilage. It is coded by joint and by whether the work is a minor debridement or a more extensive cartilage procedure.

Arthroscopic removal of only the torn portion of a knee meniscus, leaving healthy meniscus intact. It is coded differently from a meniscus repair or a total meniscectomy.

Shoulder arthroscopy that removes bone spurs and inflamed tissue beneath the acromion to relieve impingement. It is often performed with other shoulder procedures, so bundling rules apply.

Surgical fusion of a joint so it no longer moves, usually to relieve pain or stabilize an unstable segment. Bone surfaces are prepared and held together until they heal as one.

Replacement of the knee's worn surfaces with metal and plastic components. Coding depends on whether the patella is resurfaced and whether the procedure is primary or a revision.

Replacement of only one side of a joint, typically the femoral head after a hip fracture, while leaving the patient's own socket intact.

Surgery that joins two or more vertebrae so they heal into one solid segment, often using bone graft and hardware. Coding depends on approach, levels treated, and whether grafting was performed.

Removal of part of the lamina, the bony arch at the back of a vertebra, to relieve pressure on the spinal cord or nerves. It may be coded alone or with decompression and fusion.

Removal of part or all of an intervertebral disc, usually to relieve nerve pressure caused by a herniation. The approach and whether it is cervical or lumbar affect code choice.

Which side of the body a condition or procedure affects: right, left, or bilateral. ICD-10-CM requires this for most musculoskeletal injuries, and omitting it is a common denial cause.

An extra ICD-10-CM character used with injury codes to show the encounter type: initial treatment, subsequent care, or a late effect known as a sequela.

A grading system for open fractures based on wound size, soft-tissue damage, and contamination. The grade guides treatment and is documented to support code selection.

A fracture through bone already weakened by disease, such as a tumor or osteoporosis. Coding differs from traumatic fracture because the underlying condition is sequenced first.

A system for growth plate fractures in children, graded I through V by how the break passes through the physis, metaphysis, and epiphysis.

An ICD-10-CM code describing how and where an injury happened, such as a fall or a motor vehicle crash. It adds context and is often required on injury claims.

A modifier added to an evaluation and management service to show it was significant and separate from a procedure performed the same day, such as assessing a new problem.

The services included in a surgical code without extra payment: the operation itself, typical postoperative care, and related minor services during the global period.

The number of days around surgery during which routine follow-up care is included in the surgical payment, commonly 0, 10, or 90 days depending on the procedure.

A modifier showing that two procedures were distinct and should not be bundled, such as different sites, separate lesions, or separate sessions. Payers review it closely and require documentation.

A modifier for a bilateral procedure performed on both sides of the body during the same session, when the code itself does not already describe bilateral care.

A modifier attached to an evaluation and management service that led to the decision to perform surgery, often used when the visit falls within a global period.

A payer edit that pairs codes considered not separately payable together, typically because one service is bundled into the other. Overriding it requires a modifier and documentation supporting separate service.

The requirement that a service be reasonable and needed to diagnose or treat the patient's condition, be documented in the record, and be supported by payer policy.

A payer's policy stating which services are covered in a region and under what conditions. It helps coders confirm diagnosis support before a claim is submitted.