Crystal's Coder Hub🦴 CPT 20902 — Harvesting of a Major or Large Autogenous Bone Graft From Any Donor Area, Performed Through a Separate Skin Incision Not Included in the Primary Procedure Code
Quick Reference
wRVU: 4.47 | Global Period: 000 (same day) | Assistant Payable: ❌ No (000 global — minor surgical procedure) | Bilateral Indicator: 0 (not applicable)
📋 Clinical Description
CPT 20902 describes the surgical harvest of a major- or large-sized autogenous bone graft from a donor site on the patient’s own body, performed through a dedicated skin incision that is not encompassed by the primary procedure’s code descriptor. The bone graft is then transferred to a recipient site to restore structural integrity, promote osseous healing, or fill a bony defect. This code captures the procurement step only — it does not describe how the graft is ultimately used (e.g., placed into a spinal interbody cage, packed into a mandibular defect, or used for craniofacial reconstruction), which is governed by the primary procedure code.
The primary clinical goal of 20902 is to provide the surgeon a separately reportable pathway for obtaining substantial amounts of autogenous bone — typically from the iliac crest, fibula, proximal tibia, rib, or calvarium — using instruments (curettes, osteotomes, Gigli saws, power instrumentation) to create corticocancellous strips, morselized chips, or structural segments. This is distinct from minor grafts (20900) that involve small dowels or buttons obtainable through the primary incision, and from local spine autografts (20936) harvested through the same incision as a spinal fusion.
This procedure may be performed in the following clinical contexts:
- Spinal Fusion (Orthopedic/Neurosurgical) — Major bone graft harvest from the iliac crest or rib to supplement interbody or posterolateral arthrodesis in cases of spondylolisthesis, degenerative disc disease, or spinal deformity, when the primary spinal fusion code does not bundle graft procurement
- Craniofacial Reconstruction (OMS/Plastic Surgery) — Large autogenous bone harvest for mandibular reconstruction, alveolar cleft grafting, or maxillary buttress reconstruction when the primary reconstructive code (e.g., 21196) does not include obtaining the graft
- Complex Long-Bone Reconstruction (Orthopedic Trauma) — Structural graft harvest for segmental bone defects after open fracture, nonunion, or tumor resection, requiring large corticocancellous segments from the iliac crest or fibula
- Revision or Failed Prior Graft — Re-harvest of autogenous bone when a prior graft has been resorbed, failed to incorporate, or additional graft volume is needed for a staged reconstruction
- Post-Traumatic or Post-Tumor Defect — Harvest for large bony defects created by trauma, tumor extirpation, or infection where synthetic or allograft alternatives have been deemed insufficient
🔬 Anatomical & Procedural Considerations
| Modality / Technique | Mechanism / Steps | Key Notes |
|---|---|---|
| Iliac Crest Harvest (Open) | Incision over the iliac crest; subperiosteal dissection; corticocancellous strips or full-thickness blocks harvested with osteotome or oscillating saw | Gold standard for volume and corticocancellous content; risk of gait disturbance, iliac fracture, or chronic pain at donor site; document laterality |
| Fibular Harvest | Lateral or posterior approach to the fibular shaft; cortical and cancellous bone removed with oscillating saw and osteotome; may be structural or morselized | Provides long, straight structural grafts; useful for large segmental defects; risk of peroneal nerve injury and ankle instability |
| Tibial Harvest | Medial proximal tibial approach; corticocancellous chips or core grafts obtained | Less invasive than iliac crest; lower morbidity; limited volume; useful for metaphyseal defects |
| Calvarial Harvest | Full-thickness or split-thickness craniotomy at parietal region; outer table or full-thickness bone removed | Low morbidity; excellent incorporation; limited volume; primarily used in craniofacial applications |
| Rib Harvest | Posterolateral thoracotomy or extrapleural approach; one or more ribs removed subperiosteally | Used in thoracic spine fusions or when large structural grafts are needed; risk of pneumothorax and intercostal nerve injury |
Clinical Pearl
The single most important documentation element for 20902 is the phrase “separate incision” — if the graft is harvested through the same incision used for the primary procedure, the harvest is considered bundled regardless of graft size. Always ensure the operative note (1) states the graft is “major” or “large,” (2) identifies the donor site by name, and (3) explicitly notes the harvest was performed through a separate incision. Without all three elements, payers will deny the code as included in the primary procedure or downcode to 20900.
✅ Procedure Includes
- Pre-incision donor site marking and sterile preparation of the harvest area
- Local anesthetic infiltration at the donor site (even when the primary procedure is performed under general or regional anesthesia)
- Skin incision, subcutaneous dissection, and identification of the donor bone
- Subperiosteal elevation and exposure of the cortical bone surface
- Osteotomy, corticotomy, or full-thickness bone removal using appropriate instrumentation (osteotome, saw, curette, rongeur)
- Hemostasis at the donor site (bone wax, electrocautery, bone wax substitutes)
- Wound closure of the donor site in layers (deep fascia, subcutaneous tissue, skin) or application of bone wax and pressure dressing for percutaneous techniques
- Irrigation and sterile dressing application at the donor site
- Transfer or handoff of the harvested graft material to the primary surgical field (does not include placement at the recipient site — that is captured by the primary procedure code)
- Post-donation local wound care and initial dressing
❌ Excludes / Do Not Report Together
| Code | Description | Relationship to 20902 |
|---|---|---|
| 20900 | Bone graft, any donor area; minor or small (e.g., dowel or button) | Same family — 20900 is for small/minor grafts harvestable through a small incision; 20902 is for major/large grafts requiring a formal incision. Choose based on documented graft size. |
| 20936 | Autograft for spine surgery only (includes harvesting the graft); local (e.g., ribs, spinous process, or laminar fragments) obtained from same incision | Different procurement method — 20936 is for spine-local autografts harvested through the same incision as the spinal procedure; 20902 is for grafts from a separate incision at any donor site |
| 21210 | Graft, bone; nasal, maxillary or malar areas (includes obtaining graft) | Mutually exclusive — 21210 already includes obtaining the graft; 20902 cannot be reported alongside it |
| 21215 | Graft, bone; mandible (includes obtaining graft) | Mutually exclusive — 21215 already includes bone harvest within its descriptor; 20902 is not separately reportable |
| 20930 | Allograft, morselized, for use in spine surgery only | Different graft type — 20930 is cadaver-derived morselized allograft for spine; 20902 is autogenous |
| 20931 | Allograft, structural, for use in spine surgery only | Different graft type — cadaver-derived structural allograft; 20902 is autogenous |
| 20937 | Autograft for spine surgery only (includes harvesting the graft); morselized (through separate skin or fascial incision) | Overlapping but anatomically restricted — 20937 is spine-specific autograft harvest; 20902 is for any donor area outside the spine |
| E/M codes (992xx / 920xx) | Office visit, any level | Separately reportable only when modifier -25 is appended to the E/M code, documenting a significant, separately identifiable evaluation beyond routine pre-procedure assessment |
Bundling Alert — Global Period is 000, Not 010 or 090
20902 carries a zero-day (000) global period, meaning no follow-up visits are bundled into this code. This differs from the primary reconstructive or spinal fusion procedure (which typically has a 90-day global). All donor-site postoperative visits after the day of surgery are separately billable under standard E/M rules — but be cautious: if the follow-up visit pertains only to the primary procedure’s global period management, it may be bundled into that procedure’s global even though 20902 itself has no global. The most common audit finding for 20902 is not the follow-up visit but rather the initial encounter: failure to document that the graft harvest was performed through a separate incision not included in the primary procedure, or use of the word “minor” when “major” was intended (or vice versa), triggering a downcode to 20900 or outright denial.
🌳 Code Tree — AMA Section: Surgery — General Grafts (or Implants) Procedures on the Musculoskeletal System
CPT 20900-20938 [General Grafts (or Implants) Procedures on the Musculoskeletal System]
│
├── 20900-20902 [Bone Graft, Any Donor Area]
│ ├── 20900 Bone graft, any donor area; minor or small (e.g., dowel or button) (Global: 000)
│ └── ▶▶ 20902 Bone graft, any donor area; major or large ← YOU ARE HERE (Global: 000)
│
├── 20910-20912 [Cultured and/or Frozen Allografts]
│ ├── 20910 Cultured/frozen allograft (any tissue)
│ └── 20912 Cultured/frozen allograft for spine
│
├── 20924 [Cartilage Graft]
│ └── 20924 Cartilage graft, any area
│
├── 20930-20932 [Allograft (Morselized/Structural) — Spine and Other]
│ ├── 20930 Allograft, morselized, or placement of osteopromotive material, for spine surgery only
│ ├── 20931 Allograft, structural, for spine surgery only
│ └── 20932 Allograft, morselized, for use on other than spine
│
├── 20936-20938 [Autograft for Spine Surgery Only]
│ ├── 20936 Autograft (includes harvesting); local — same incision
│ ├── 20937 Autograft (includes harvesting); morselized — separate incision
│ └── 20938 Autograft (includes harvesting); structural, bicortical/tricortical — separate incision
│
└── 20974-20975 [Bone Growth and Healing Stimulators]
├── 20974 Bone stimulator, noninvasive
└── 20975 Bone stimulator, invasive (implantable)
Specificity & Sizing Tip
The distinction between 20900 (minor/small) and 20902 (major/large) is driven entirely by documented graft size — there is no anatomical or procedural technique difference that determines code selection. A corticocancellous dowel from the iliac crest may be minor; a full-thickness iliac crest block is major. Payers and auditors look for quantitative or qualitative descriptors (e.g., “3 cm corticocancellous strip,” “full-thickness iliac block,” “large volume morselized graft”) to justify 20902. When in doubt, document graft dimensions and the clinical rationale for the volume needed.
💰 RVU & Reimbursement Profile
| Component | Value |
|---|---|
| Work RVU (wRVU) | 4.47 (verify against current CMS MPFS for applicable year) |
| Practice Expense RVU (Non-Facility) | 1.94 |
| Practice Expense RVU (Facility) | 1.94 |
| Malpractice RVU | 0.83 |
| Total RVU | 7.24 |
| Global Period | 000 (same day) |
| Medicare National Rate (Non-Facility) | ~33.40) |
| Bilateral Indicator | 0 — not applicable; bone graft is not a bilateral procedure |
| Assistant Surgeon | ❌ Not payable (000 global — classified as minor procedure) |
| Co-Surgeon | ✅ Applicable with modifier -62 when two surgeons perform distinct portions |
| Team Surgery | ❌ Not applicable |
| PC/TC Split | 0 — Procedure code only (no professional/technical component split) |
| Modifier -51 Exempt | No — subject to multiple-procedure reduction |
| Anesthesia | Local anesthesia at donor site included in code; general/regional anesthesia for primary procedure is separately billable if applicable |
Bilateral Billing Rules
CPT 20902 has a bilateral indicator of 0, meaning the concept of bilateral harvesting does not apply in the standard sense. If bone graft is needed at two distinct anatomical donor sites (e.g., left and right iliac crests), report 20902 with modifier -RT for the right side and 20902 with modifier -LT for the left side — these are treated as anatomically distinct procedures, not bilateral reduction cases. Payment is made per line, subject to standard NCCI edits.
🏷️ Modifier Reference
| Modifier | Name | When to Apply |
|---|---|---|
| -RT | Right Side | Graft harvested from the right iliac crest, right fibula, or other right-sided donor site |
| -LT | Left Side | Graft harvested from the left iliac crest, left fibula, or other left-sided donor site |
| -50 | Bilateral Procedure | Not applicable (bilateral indicator = 0); use -RT/-LT on separate lines for bilateral donor sites |
| -51 | Multiple Procedures | Apply to 20902 when performed on the same date as a higher-RVU primary procedure (e.g., spinal fusion 22551, mandibular reconstruction 21196). List the primary procedure first. |
| -52 | Reduced Services | Graft harvest was partially completed or intentionally limited (e.g., surgical bleeding required termination before planned volume was obtained) — document reason thoroughly |
| -53 | Discontinued Procedure | Procedure terminated after incision due to patient safety concern (e.g., hemodynamic instability); document indication and time of discontinuation |
| -58 | Staged or Related Procedure | Planned second-stage graft harvest for a staged reconstruction within the global period of the primary procedure |
| -59 | Distinct Procedural Service | When payer incorrectly bundles 20902 with the primary procedure code; document (1) separate incision, (2) separate anesthetic, (3) distinct operative area, (4) independent clinical indication for the harvest |
| -62 | Two Surgeons | Two primary surgeons each performing distinct operative work — e.g., one surgeon at recipient site, second surgeon performing the graft harvest |
| -76 | Repeat Procedure by Same Physician | Rarely applicable; if surgeon must re-harvest graft same day due to specimen loss or contamination |
| -78 | Unplanned Return to OR | Return to operating room during global period for a related complication (e.g., donor site hematoma requiring evacuation) |
| -79 | Unrelated Procedure During Postop Period | Unrelated procedure performed during the global period of the primary procedure (note: 20902 itself has 000 global, so this modifier is not applicable to 20902 — it may apply to the primary procedure) |
🩺 Common ICD-10-CM Pairings
Primary Diagnosis Grouping — Spinal Pathology (Orthopedics/Neurosurgery)
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| M43.12 | Spondylolisthesis, lumbar region | — | Most common spinal fusion indication when instability or progression is documented; supports 20902 for iliac crest or rib graft harvest for interbody or posterolateral arthrodesis |
| M43.16 | Spondylolisthesis, lumbosacral region | — | Lumbosacral-specific variant; same surgical approach as M43.12; document grade of slip |
| M45.6 | Ankylosing spondylitis of lumbar spine | ✅ HCC 86 (Spondylopathy) — RAF ~0.285 | Inflammatory spondylopathy causing progressive kyphosis requiring fusion; capture annually for HCC adjustment |
| M47.12 | Spondylolisthesis, lumbar region, without myelopathy or radiculopathy | — | Lower-severity variant; document presence of symptoms or mechanical instability to justify surgical intervention |
| M51.26 | Other intervertebral disc displacement, lumbar region | — | Degenerative disc disease as surgical indication; commonly paired with M43.12 in fusion workup |
Secondary Diagnosis Grouping — Craniofacial (OMS / Plastic Surgery)
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| Q35 | Cleft palate | ✅ HCC 42 (Craniofacial Anomalies) — RAF ~0.495 | Alveolar cleft bone grafting (secondary bone graft); 20902 reported when graft is harvested from iliac crest for cleft site reconstruction |
| Q36 | Cleft lip | — | May accompany Q35; supports bone graft indication if alveolar defect is present |
| Q37 | Cleft palate with cleft lip | ✅ HCC 42 — RAF ~0.495 | Combined cleft; bone graft typically performed between ages 8-12 for secondary alveolar reconstruction |
| Q75.8 | Other specified congenital malformations of skull and face bones | — | Alternative code for complex craniofacial anomalies requiring bone graft reconstruction |
Underlying Etiology / Complication Codes
| ICD-10 Code | Description | HCC? | Clinical Notes |
|---|---|---|---|
| S32.009A | Fracture of unspecified part of lumbar vertebral body, initial encounter | — | Trauma-related indication for bone graft harvest |
| M84.459A | Pathologic fracture, unspecified tibia, initial encounter | — | Pathologic bone loss requiring structural graft replacement |
| M87.119 | Osteoporosis with current pathological fracture, unspecified site | ✅ HCC 56 (Osteoporosis) — RAF ~0.312 | Osteoporotic collapse requiring graft stabilization |
| T84.89XS | Complication of internal orthopedic fixation device at specified site | — | Failed hardware requiring revision with supplementary autogenous graft |
Coding Specificity Reminder
Spinal fusion coding demands anatomic level specificity — document the exact vertebral segments (e.g., L4-L5, L5-S1) and laterality of the approach. ICD-10-CM codes for spondylolisthesis require identification of the spinal region (cervical, thoracic, lumbar, lumbosacral). ICD-10-CM specificity requirements are not optional: code to the highest level of documented specificity, and query the provider when the operative note states “lumbar spine” without specifying segment levels or when “bone graft” is mentioned without characterizing it as major/large or identifying the donor site by name.
🏥 MS-DRG Considerations (Inpatient)
Inpatient Coding Reminder
CPT 20902 is performed exclusively in the outpatient or ASC setting — it is a bone graft procurement code that supports but does not itself generate an inpatient admission. There are no routine MS-DRG assignments for 20902 in isolation. If a patient undergoing an inpatient admission for an unrelated principal diagnosis (e.g., traumatic fracture, spinal cord injury) also has an autogenous bone graft harvested during the same hospitalization, CPT 20902 may be reported as an additional procedure. In this scenario, the principal ICD-10-CM diagnosis (e.g., the fracture or spine pathology) combined with any operative procedures groups to the appropriate DRG based on CC/MCC tier. The graft harvest itself (20902) has minimal DRG weight impact as an ancillary procedure. See the ICD-10-PCS Crosswalk section below for inpatient PCS coding of bone graft procedures.
🔧 ICD-10-PCS Equivalents (Inpatient Facility Coding)
Note
ICD-10-PCS equivalents for bone graft harvesting are applicable only when the graft harvest occurs during an inpatient admission and must be captured as a separate procedure for DRG completeness. In outpatient settings, CPT 20902 is the appropriate code. PCS root operation selection depends on whether the bone is removed by cutting away bone (Excision, character value T) or taken as a segment (Resection, character value 1). For most iliac crest and fibular harvests, Excision is the correct root operation.
| PCS Code | Full Description | Applicable Modality / Donor Site |
|---|---|---|
0CT93ZX | Excision of bone, right pelvic girdle — Open approach, no device, no qualifier | Iliac crest harvest — right side |
0CT94ZX | Excision of bone, left pelvic girdle — Open approach, no device, no qualifier | Iliac crest harvest — left side |
0CT95ZX | Excision of bone, bilateral pelvic girdle — Open approach, no device, no qualifier | Bilateral iliac crest harvest |
0XB83ZX | Excision of bone, right fibula — Open approach, no device, no qualifier | Fibular harvest — right side |
0XB93ZX | Excision of bone, left fibula — Open approach, no device, no qualifier | Fibular harvest — left side |
PCS Character Analysis — 0CT93ZX
| Position | Character | Value | Definition |
|---|---|---|---|
| 1 | Section | 0 | Medical and Surgical |
| 2 | Body System | C | Bones (Musculoskeletal System, Upper Bones) |
| 3 | Root Operation | T | Excision — cutting out or off, without replacement, all of a body part |
| 4 | Body Part | 9 | Pelvic Girdle |
| 5 | Approach | 3 | Open — through an incision, with exposure of the operative field |
| 6 | Device | Z | No Device |
| 7 | Qualifier | X | No Qualifier |
PCS Root Operation: Excision (T) vs. Resection (1)
- Use Excision (T) when only a portion of the bone is removed and the structural continuity of the remaining bone is preserved — e.g., harvesting corticocancellous strips from the iliac crest while leaving the iliac wing intact.
- Use Resection (1) when an entire, distinct anatomic bone segment is removed — e.g., harvesting an entire fibular segment with osteotomies at both ends. In practice, most iliac crest graft harvests are coded as Excision, while free fibular transfers typically receive a Resection code.
- PCS has no modifier equivalent for bilateral procedures — assign separate PCS code lines for each side treated (e.g.,
0CT93ZXand0CT94ZXfor bilateral iliac crest harvest).
💊 Coding Scenarios and Examples
Scenario 1 — [SETTING: ASC / Outpatient Hospital]: Iliac Crest Bone Graft for Lumbar Spinal Fusion
Clinical Vignette: A 52-year-old female with symptomatic Grade II L4-L5 spondylolisthesis and bilateral L5 radiculopathy presents for surgical management. Intraoperatively, a posterior lumbar interbody fusion at L4-L5 with structural allograft and autogenous bone is planned. A separate left iliac incision is made, and 8 cc of corticocancellous autograft is harvested from the anterior ilium. The graft is packed around the allograft within the interbody cage. Estimated blood loss for the harvest portion: 50 mL. A separate E/M service was not performed on the day of surgery beyond the routine perioperative assessment.
| Field | Code | Rationale |
|---|---|---|
| CPT | 22612 | Lumbar interbody arthrodesis, single level, with discectomy and decompression |
| CPT | 20902-51 | Bone graft, major, left iliac crest — with -51 because reported alongside the higher-RVU primary fusion code |
| PDx | M43.16 | Spondylolisthesis, lumbosacral region — primary surgical indication |
| SDx | M51.26 | Disc displacement, lumbar — supporting diagnosis for fusion |
Note
The -51 modifier is appended to 20902 (the lower-RVU service) when billed with a higher-RVU primary procedure in the same operative session. The operative note explicitly documents the “separate incision” on the left iliac crest and characterizes the graft as a substantial corticocancellous volume, supporting 20902 over 20900. No separate E/M is billed perioperatively as the routine pre- and postoperative assessments are bundled into the global period of the primary fusion procedure.
Example 2 — Setting: ASC: Fibular Bone Graft for Mandibular Reconstruction (OMS)
Clinical Vignette: A 34-year-old male with a history of ameloblastoma of the right mandible, status post marginal mandibulectomy with titanium plate reconstruction, presents for secondary reconstruction with autogenous bone. A segmental harvest of 10 cm of right fibular bone is performed through a lateral incision over the right leg, with the peroneal nerve identified and protected. The fibular graft is osteotomized into two segments and fixated to the native mandible with miniplates to restore continuity. A second surgeon (co-surgeon) assisted with the harvest while the primary surgeon managed the mandibular preparation. Separate operative fields were maintained.
| Field | Code | Rationale |
|---|---|---|
| CPT | 21196-62 | Reconstruction of mandibular rami and/or body, sagittal split — with -62 for co-surgeon |
| CPT | 20902-62 | Bone graft, major, right fibula — with -62, second surgeon performs the harvest |
| PDx | Q75.8 | Other congenital malformations of skull and face bones — postoperative defect reconstruction |
| SDx | M84.444A | Pathologic fracture, right mandible, initial encounter — prior pathologic process from ameloblastoma |
Warning
The co-surgeon (modifier -62) model requires clear documentation that both surgeons performed distinct, concurrent operative work. The operative note must describe what each surgeon did independently. If the second surgeon only assisted with wound exposure rather than independently performing the harvest, modifier -62 is not supported — use -80 (assistant surgeon) or -82 (mandatory assistant) instead. Always confirm payer policies on co-surgeon billing for 20902 before submission.
Example 3 — Setting: Outpatient Hospital: Failed Prior Graft Requiring Re-Harvest (CDI Scenario)
Clinical Vignette: A 61-year-old female returns 14 months after posterior lumbar interbody fusion (L5-S1) with ongoing mechanical low-back pain. Imaging reveals pseudarthrosis at the fusion site with lucency around the graft area. Revision surgery is planned to add an interbody cage at L5-S1 with supplemental autogenous bone graft. An open re-harvest of 12 cc of corticocancellous graft from the right iliac crest is performed through a new incision over the previously healed scar.
| Field | Code | Rationale |
|---|---|---|
| CPT | 22612 | Lumbar interbody arthrodesis, single level, with discectomy |
| CPT | +20902-RT | Bone graft, major, right iliac crest — separate incision, new harvest |
| PDx | M96.1 | Postlaminectomy syndrome, not elsewhere classified — failed prior fusion |
| SDx | M43.16 | Spondylolisthesis, lumbosacral — underlying instability contributing to pseudarthrosis |
Note
Global period reminder: The original 22612 was performed 14 months ago (90-day global period long expired), so no global period conflict exists for billing the revision procedure. The 20902 also carries a 000 global period. No modifier -78 or -58 is needed as this is not an unplanned return or staged procedure within the same global window — it is a revision for a different clinical problem (pseudarthrosis) after the prior global period ended.
⚠️ Common Coding Pitfalls
| Pitfall or Tip | |
|---|---|
| ❌ | Missing “Separate Incision” Documentation. The most frequent denial trigger. If the operative note describes graft harvest but does not state it was performed through a skin incision separate from the primary procedure incision, payers will treat the harvest as included in the primary code (per NCCI §6). Fix: Ensure the operative note explicitly states “a separate incision was made over the [donor site] for bone graft harvest.” |
| ❌ | Failure to Characterize Graft Size (Major vs. Minor). Vague language such as “bone graft was obtained” without specifying major or large size invites a downcode to 20900 (minor/small) with reduced reimbursement. Fix: Document graft dimensions, weight, or qualitative descriptors such as “large corticocancellous strips” or “full-thickness iliac block.” |
| ❌ | Reporting 20902 With Codes That Already Include Harvest. Codes like 21210 (nasal/maxillary/malar bone graft includes obtaining graft), 21215 (mandible bone graft includes obtaining graft), and 20936-20938 (spine autograft codes that include harvesting) are mutually exclusive with 20902. Fix: Review the primary procedure’s CPT descriptor for the phrase “includes obtaining graft” — if present, do not bill 20902. |
| ❌ | Omitting Modifier -51 When Bundled With Primary Procedure. Since 20902 is not exempt from the multiple-procedures edit, failure to append -51 when reporting alongside a higher-RVU procedure results in a denial or downcode. Fix: Always append -51 to 20902 and list it after the primary procedure. |
| ❌ | Incorrect Use of Modifier -59 Without Adequate Documentation. Modifier -59 (distinct procedural service) requires documentation of at least one of the following: separate incision, separate lesion, separate injury, or separate anatomic area. A generic -59 without this specificity will be denied by automated edit systems. Fix: Document the separate surgical field, distinct anesthesia administration, and clinical necessity for the separate harvest. |
| ❌ | Confusing 20902 With Spinal Autograft Codes (20936-20938). 20936-20938 are restricted to spine surgery autografts and include harvesting within their descriptors. If the graft harvest is from the iliac crest and the procedure is a spinal fusion, use 20936 (local/same incision) or 20937 (separate incision/morselized) if the harvest is spine-related — or 20902 if the graft is from a non-spine donor site or the primary procedure is not a spine code. Fix: Match the graft code to the anatomic relationship between harvest site and primary procedure. |
📚 Sources
1 AMA CPT Professional Edition 2026, Section 20900-20938 — General Grafts (or Implants) Procedures on the Musculoskeletal System. 2 CMS. “Medicare Physician Fee Schedule — CY 2026 Final Rule (CMS-1832-F).” Addendum B: Relative Value Units and Related Information. Work RVU for CPT 20902: 4.47; Total RVU: 7.24. National conversion factor: ~$33.40. CMS Physician Fee Schedule Look-Up Tool, accessed May 2026. 3 CMS. “Medicare National Correct Coding Initiative (NCCI) Policy Manual, Chapter 4 — Correct Coding, 2026 Final Version.” NCCI §6: Tissue transfer procedures bundled when included in primary code descriptor. NCCI §7: Graft codes not reportable when primary code descriptor includes procurement. 4 CMS. “Medicare NCCI Policy Manual, 2026.” Bone growth/healing stimulator codes 20974-20975 reportable separately from bone graft harvest codes per NCCI §9. 5 AAOMS Coding Committee. “Coding for Bone Grafts in Oral and Maxillofacial Surgery.” Revised January 2025. — Guidelines for correct usage of 20900/20902 vs. bundled codes 21210/21215; co-surgeon modifier -62 standards. 6 CMS. “IPPS Final Rule FY2026 — MS-DRG Definitions Manual v43.” Relevant MDC/DRG grouping logic for inpatient admissions involving bone graft procedures as secondary/intermediate operating room procedures. 7 MCPHS / Mira Health. “CPT 20902 — Harvesting of a Major or Large Autogenous Bone Graft: Billing Guide.” Verified May 2026. — Documentation requirements, denial prevention strategies, and Medicare rate verification.