CPT Code 20900: Bone Graft, Minor (Harvest from Distant Site)

CPT code 20900 is for minor bone graft harvesting. Read this guide to learn about documentation essentials, billing guidelines, and applicable modifiers.

Use Code

What is CPT code 20900?

CPT code 20900 is a medical code describing the procedure in which a surgeon obtains a small volume of autologous bone graft, any donor area, via a separate incision distinct from the primary surgical site. This minor bone graft procedure is typically performed to repair small bony defects or enhance bone healing in surgeries such as spinal fusions, fracture repairs, or joint arthrodesis. The harvested graft, usually cancellous bone, is sourced from a distant donor area like the iliac crest or ribs.

Code 20900 specifically includes obtaining graft tissues via a distinct incision, ensuring correct reimbursement separately from the primary surgery.

What is bone graft harvesting?

Bone graft harvesting involves collecting bone tissue from one site of the patient's body (donor area) to use in another location requiring structural or biological support. The harvested bone provides osteogenic properties, aiding healing, filling defects, or promoting fusion.

Minor bone graft harvesting, as in 20900, typically involves a smaller bone volume and minimal incision, distinguishing it from major graft harvesting, which involves larger volumes of bone or structural grafts harvested through more extensive procedures.

CPT code 20900 documentation requirements

Accurate documentation must detail all aspects of the graft harvest clearly and thoroughly, including:

Separate incision site

Explicitly document that bone was obtained via a separate skin or fascial incision distinct from the primary procedure.

Harvest technique and anatomical location

Include details of the surgical approach, clearly describing the anatomical donor area (e.g., iliac crest, rib).

Volume and type of bone obtained

Describe the nature (e.g., cancellous bone, cortical dowel) and approximate volume of bone harvested.

Graft use or destination

Specify clearly where the graft tissue was placed or used, such as in an interbody cage, fusion site, or fracture repair.

Closure and any complications

Document incision closure techniques and any intraoperative or postoperative complications related to graft harvesting.

CPT code 20900 billing guidelines

Correct billing ensures proper reimbursement and compliance with payer policies for minor bone graft harvesting:

Separate incision requirement

Bill CPT code 20900 only if the graft is harvested through an incision separate from the primary operative site. Harvesting from the primary operative field is not separately billable.

Exclusion of large-volume grafts

This medical code should not be used for structural or major grafts, such as those requiring substantial bone or cartilage volume. Use CPT 20902 for major grafts instead.

Check payer bundling policies

Some payers may bundle minor graft harvesting into the primary surgery reimbursement. Always verify local coverage determinations (LCDs).

Applicable modifiers to CPT code 20900

Modifiers clarify circumstances surrounding the procedure for accurate billing and appropriate reimbursement:

Modifier 50 (Bilateral procedure): When the graft is harvested bilaterally from separate donor areas.
Modifier 51 (Multiple procedures): For multiple procedures during the same session.
Modifier 59 (Distinct procedural service): To denote harvesting was distinctly separate from other services.
Modifier 76/77 (Repeat procedure): If harvesting is repeated by the same or different physician on the same day.
Modifier 78 (Unplanned return): For an unplanned return to surgery related to the original procedure.
Modifier 79 (Unrelated procedure): If the graft harvesting is unrelated to the original procedure during the postoperative period.
Modifier 80, 81, 82 (Assistant surgeon roles): When additional surgeons or assistants are involved.
Modifier AS: If a physician assistant, nurse practitioner, or clinical nurse specialist assisted.

Related CPT codes

Other related graft and implantation codes include:

20902 – Major bone graft harvesting (larger volume or structural graft).
20931 – Allograft for spine surgery.
20932–20934, 20936-20938 – Other structural and morselized allograft procedures.
22842 – Posterior segmental instrumentation, often used in spinal fusion surgeries.