CPT 22600: Arthrodesis, Posterior or Posterolateral Technique, Single Interspace; Cervical Below C2 Segment
1. Overview & Code Description
- CPT Code: 226001
- Long Descriptor: Arthrodesis, posterior or posterolateral technique, single interspace; cervical below C2 segment1
- Short Descriptor: Arthrodesis cervical below C2 segment1
- Service Classification: Major Surgical Procedure (Musculoskeletal System / Spine and Spinal Cord / Arthrodesis)1
- Status: Active, billable standalone primary procedure code in the 2026 CPT code set and Medicare Physician Fee Schedule (PFS)1,2
Clinical Summary
In CPT 22600, the surgeon performs a posterior or posterolateral cervical spinal fusion on one intervertebral disc space below the C2 vertebra (e.g., C2–C3, C3–C4, C4–C5, C5–C6, C6–C7, or C7–T1)1. Through a midline or paramedian posterior neck incision, the paraspinal muscles and soft tissues are dissected and retracted to expose the posterior cervical elements (spinous processes, laminae, facet joints, and lateral masses)1. The facet joints and posterior cortical bone are decorticated to create a vascularized host bed, and bone graft material (autograft, allograft, and/or bone graft substitute) is packed into the facet joints and across the posterior/posterolateral elements to facilitate bony arthrodesis1.
2. CPT Coding Guidelines & Rules
- Interspace Reporting: CPT 22600 represents fusion of a single interspace (one motion segment / intervertebral disc level)1.
- Additional Interspaces: When fusion extends across multiple interspaces (e.g., C4–C6 constitutes two interspaces: C4–C5 and C5–C6), bill CPT 22600 for the first interspace and add-on code 22614 for each additional interspace fused1.
- C1–C2 / Occiput-C2 Exclusion: Fusion involving C1–C2 or Occiput–C2 is not coded with 22600; use 22590 (Arthrodesis, posterior technique, craniocervical / occiput-C2) or 22595 (Arthrodesis, posterior technique, atlas-axis / C1-C2)1.
- Separate Reporting of Grafts & Hardware: Bone grafts and spinal instrumentation are not bundled into 22600 and must be separately reported using appropriate add-on codes1,3:
- Bone Grafts: 20930 (Allograft, morselized), 20931 (Allograft, structural), 20936 (Autograft, local harvested from same incision), 20937 (Autograft, morselized from separate incision), or 20938 (Autograft, structural from separate incision)1.
- Spinal Instrumentation: 22840 (Posterior non-segmental instrumentation), 22842 (Posterior segmental instrumentation, 3 to 6 vertebral segments), or other appropriate posterior instrumentation codes1.
- Decompression / Laminectomy / foraminotomy: If neural decompression (e.g., laminectomy, facetectomy, foraminotomy) is performed for nerve root or spinal cord relief (and not merely to prepare the graft bed), report the appropriate decompression code (e.g., 63001, 63045) in accordance with NCCI edits and modifier rules1,3.
3. CMS Physician Fee Schedule (PFS) Indicators
According to the CMS PFS Relative Value File2:
- Global Surgery Period: 090 (Major surgical package including standard preoperative care, intraoperative work, and routine 90-day postoperative visits)2
- Bilateral Surgery Indicator: 0 (150% bilateral payment adjustment does not apply; bilateral concepts do not apply to midline spine fusion at a single interspace; do not append Modifier -50)2
- Assistant at Surgery: Indicator 2 (Assistant surgery payment is permitted; Modifiers -80, -81, -82, or -AS are eligible for payment with appropriate clinical documentation)2
- Co-Surgeons (Modifier -62): Indicator 2 (Co-surgery is permitted; two surgeons of different specialties or complementary roles may bill simultaneously with Modifier -62 with standard documentation of distinct components)2
- Team Surgery (Modifier -66): Indicator 0 (Team surgery is not permitted/covered)2
- Pre-Operative / Intra-Operative / Post-Operative Split: Pre-op: 10% | Intra-op: 70% | Post-op: 20%2
- Diagnostic Imaging / Multiple Procedure Reductions: Subject to standard multiple procedure payment reduction (MPPR) rules when reported alongside non-add-on surgical procedures2.
4. Medicare Coverage Analysis: LCD/NCD vs. CMS PFS Lookup
- CMS PFS Lookup Position: In the CMS Physician Fee Schedule, 22600 is classified under Status Indicator A (Active, covered service with nationally assigned RVUs under the Medicare Part B Physician Fee Schedule)2.
- National Coverage Determinations (NCD): There is currently no restrictive NCD mandating national non-coverage or restrictive national limits specifically for posterior cervical spinal fusion (unlike lumbar artificial disc replacement or specific experimental spine procedures)4.
- Local Coverage Determinations (LCD) & Articles (LCA): Cervical spine fusion procedures are governed by regional Medicare Administrative Contractor (MAC) medical necessity criteria and commercial medical policies4. Key medical necessity requirements across MACs include:
- Documented failure of at least 6 to 12 weeks of structured conservative therapy (e.g., physical therapy, active rehab, NSAIDs/analgesics, or cervical epidural steroid injections) unless urgent/emergent indications are present4.
- Immediate surgical indications (waiving conservative therapy): Progressive cervical myelopathy, objective rapidly worsening motor deficits, spinal instability following acute trauma/fracture, spinal tumor/malignancy decompression, epidural abscess/infection, or high-grade post-laminectomy kyphosis/deformity4.
- Objective radiological correlation (CT, MRI, or flexion/extension dynamic radiographs) confirming cervical spondylotic myelopathy, neuroforaminal/canal stenosis, severe subluxation/instability (e.g., >3 mm sagittal translation or >11 degrees angular deformity), disc herniation, or pseudarthrosis from previous surgery4.
5. Bundling & Add-On Procedures (NCCI)
| Add-On / Concomitant Code | Description | NCCI Edit Status / Billing Guidance |
|---|---|---|
| 22614 | Arthrodesis, posterior/posterolateral, each additional interspace | Add-on code; exempt from Modifier -51; report once per each additional interspace beyond CPT 226001,3 |
| 20930 / 20936 / 20937 | Autograft / Allograft for spine surgery | Add-on codes; report in addition to 22600 based on graft source and morselization1,3 |
| 22840 / 22842 | Posterior spinal instrumentation | Add-on codes; report based on non-segmental vs. segmental fixation and number of vertebral segments spanned1,3 |
| 63045 | Laminectomy/facetectomy/foraminotomy, cervical | Separate decompression code; report only when significant neural decompression is performed beyond basic exposure; check NCCI PTP edits and append appropriate anatomical/unbundling modifier (e.g., Modifier -59 / -XS) if distinct1,3 |
6. Applicable Modifiers
- Modifier -22 (Increased Procedural Services): Used when surgical complexity substantially exceeds standard work (e.g., severe scarring from prior surgeries, altered anatomy, morbid obesity); operative note must detail operative time, blood loss, and specific clinical challenges1,2.
- Modifier -51 (Multiple Procedures): Used on secondary independent surgical procedures performed in the same operative session (do not append to add-on codes like 22614, 22842, or 20930)1,2.
- Modifier -52 (Reduced Services): Used when a planned posterior fusion is partially reduced or discontinued at the surgeon’s discretion prior to complete execution1,2.
- Modifier -58 (Staged or Related Procedure in Postoperative Period): Used if posterior cervical fusion is performed as a planned second-stage procedure during the 90-day global period of an initial procedure (e.g., staged anterior-posterior 360-degree fusion)1,2.
- Modifier -59 / -XS (Distinct Procedural Service): Used to identify a distinct, non-overlapping surgical service performed at a separate anatomic level during the same operative session1,2.
- Modifier -62 (Two Surgeons / Co-Surgeons): Used when two surgeons (e.g., orthopedic spine surgeon and neurosurgeon) act as co-surgeons performing specific distinct components of 22600; both surgeons must bill 22600 -62 and dictate individual operative notes1,2.
- Modifier -80 / -81 / -82 / -AS (Assistant Surgeon / Non-Physician Assistant): Used when a qualified physician assistant, nurse practitioner, clinical nurse specialist, or second MD acts as first assistant at surgery1,2.
7. Medical Necessity & ICD-10-CM Crosswalk (2026)
Only billable, fully specified, non-parent diagnosis codes for 2026 are listed below5:
Cervical Spondylosis & Disc Disorders with Myelopathy
- M47.12 - Other spondylosis with myelopathy, cervical region5
- M50.021 - Cervical disc disorder at C4-C5 level with myelopathy5
- M50.022 - Cervical disc disorder at C5-C6 level with myelopathy5
- M50.023 - Cervical disc disorder at C6-C7 level with myelopathy5
Cervical Disc Disorders with Radiculopathy
- M47.22 - Other spondylosis with radiculopathy, cervical region5
- M50.121 - Cervical disc disorder at C4-C5 level with radiculopathy5
- M50.122 - Cervical disc disorder at C5-C6 level with radiculopathy5
- M50.123 - Cervical disc disorder at C6-C7 level with radiculopathy5
Cervical Disc Displacement & Degeneration
- M50.221 - Other cervical disc displacement at C4-C5 level5
- M50.222 - Other cervical disc displacement at C5-C6 level5
- M50.223 - Other cervical disc displacement at C6-C7 level5
- M50.321 - Other cervical disc degeneration at C4-C5 level5
- M50.322 - Other cervical disc degeneration at C5-C6 level5
- M50.323 - Other cervical disc degeneration at C6-C7 level5
Spinal Stenosis, Instability & Deformity
- M48.02 - Spinal stenosis, cervical region5
- M43.12 - Spondylolisthesis, cervical region5
- M96.0 - Pseudarthrosis after fusion or arthrodesis5
Cervical Traumatic Fractures (Initial Encounters)
- S12.000A - Unspecified fracture of first cervical vertebra, initial encounter for closed fracture5
- S12.100A - Unspecified fracture of second cervical vertebra, initial encounter for closed fracture5
- S12.200A - Unspecified fracture of third cervical vertebra, initial encounter for closed fracture5
- S12.300A - Unspecified fracture of fourth cervical vertebra, initial encounter for closed fracture5
- S12.400A - Unspecified fracture of fifth cervical vertebra, initial encounter for closed fracture5
- S12.500A - Unspecified fracture of sixth cervical vertebra, initial encounter for closed fracture5
- S12.600A - Unspecified fracture of seventh cervical vertebra, initial encounter for closed fracture5
8. Documentation Requirements
- Exact Surgical Technique: Operative report must specify the posterior or posterolateral approach, exact vertebral segments exposed, interspaces decorticated, and fusion bed preparation1.
- Specific Interspaces Identified: Clear documentation of each distinct cervical interspace fused (e.g., “Posterior fusion of C4-C5 and C5-C6”) to justify primary code 22600 and add-on code 226141.
- Bone Graft Details: Origin, type (autograft vs. allograft), harvesting site (local vs. separate fascial/iliac incision), and preparation method1.
- Instrumentation Details: Type of instrumentation (plates, lateral mass screws, pedicle screws, rods), segments instrumented, and cross-links placed1.
- Medical Necessity & Prior Conservative Care: Documentation of failure of conservative management (dates, modalities) or clear indication for emergency/urgent decompression and fusion (myelopathy, trauma, acute instability, cord compression)4.
- Imaging Confirmation: Preoperative diagnostic reports (MRI, CT, dynamic flexion/extension X-rays) demonstrating the pathology correlating to the fused cervical interspace4.
Sources
1. American Medical Association. Current Procedural Terminology (CPT®) 2026 Professional Edition. Chicago: AMA, 2025. 2. Centers for Medicare & Medicaid Services (CMS). Medicare Physician Fee Schedule (PFS) Relative Value Files and Payment Indicators, 2026. 3. Centers for Medicare & Medicaid Services (CMS). National Correct Coding Initiative (NCCI) Policy Manual for Medicare Services, Chapter IV (Surgery: Musculoskeletal System), Effective January 1, 2026. 4. Centers for Medicare & Medicaid Services (CMS). Medicare National Coverage Determinations (NCD) Manual & Local Coverage Determinations (LCD) for Cervical Spine Procedures. 5. National Center for Health Statistics (NCHS) & Centers for Medicare & Medicaid Services (CMS). ICD-10-CM Official Guidelines for Coding and Reporting FY 2026.Sources listed above correspond to superscript citations throughout this note. Verify all Medicare payment figures against your current CMS PFS Lookup tool and applicable MAC LCD prior to claim submission. Please use the latest AAPC/AHIMA Coding Books to verify each code within this note.