CPT 22558Surgery

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CPT code 22558 covers arthrodesis (spinal fusion) performed on a single intervertebral disc space in the lumbar spine using a minimally invasive anterior approach. The surgeon accesses the spine from the front of the body to fuse vertebrae together, typically to treat degenerative disc disease or instability.

Showing rates for

National Average

Base Medicare rate

$1,497.64

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

23.53

PE RVU (NF)

16.33

MP RVU

6.44

Total RVU

46.3

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document the specific intervertebral level treated (e.g., L5-S1) in both the operative report header and body to support single-level coding
Impact: Prevents downcoding or denial; missing level documentation results in 15-25% denial rate on spinal fusion claims
Bill add-on code 22585 for each additional lumbar intervertebral segment beyond the first level described by 22558
Impact: Each additional level adds approximately $1000-1200 in reimbursement; unbundling or using wrong base code causes automatic denials
Separately bill instrumentation codes (22840, 22842, 22845, 22853, 22854) when biomechanical devices are placed, ensuring operative report documents specific instrumentation type and levels
Impact: Instrumentation codes add $500-2500 per case; failure to bill separately forfeits 25-40% of potential reimbursement
Verify that 'minimally invasive' technique is explicitly documented if coding as such; traditional open anterior approaches may have different documentation expectations
Impact: Payer audits increasingly scrutinize approach documentation; inconsistent documentation triggers 30-day payment holds in 18% of cases
When general or vascular surgeon provides anterior approach/exposure, coordinate billing to avoid duplicate claims; consider modifier 62 or bill approach separately with 22558 using modifier 80
Impact: Improper coordination results in 100% denial of duplicate claim; proper modifier use preserves full entitled reimbursement for both surgeons
Document bone graft source and type separately to support add-on codes 20930-20938 (allograft) or 20936-20937 (morselized autograft)

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 22558 in 2025?

The 2025 Medicare national average reimbursement for CPT 22558 is $1497.64 for both facility and non-facility settings, based on 46.3 total RVUs and the 2025 conversion factor of $32.3465.

How many RVUs is CPT code 22558 worth?

CPT 22558 has 46.3 total RVUs in 2025, broken down as 23.53 work RVUs, 16.33 practice expense RVUs, and 6.44 malpractice RVUs, making it a high-value surgical procedure code.

Can CPT 22558 be billed for multiple levels?

No, CPT 22558 covers only a single intervertebral disc space. For each additional lumbar level beyond the first, you must use add-on code 22585, which cannot be billed alone and requires 22558 as the primary code.

What is the difference between CPT 22558 and 22630?

CPT 22558 describes anterior approach lumbar arthrodesis using minimally invasive techniques, while CPT 22630 describes posterior lumbar interbody fusion (PLIF). The key difference is the surgical approach: 22558 is anterior (from the front), 22630 is posterior (from the back).

Do I need to bill instrumentation separately with CPT 22558?

Yes, instrumentation is not included in CPT 22558 and must be billed separately using codes 22840, 22842, 22845, 22853, or 22854 depending on the specific type of instrumentation placed (plates, rods, screws, biomechanical devices), which can add $500-2500 to total reimbursement.

What modifiers are most commonly used with CPT 22558?

Common modifiers for 22558 include modifier 22 (increased procedural complexity), modifier 62 (co-surgeons when vascular surgeon assists), modifier 59 (distinct procedural service), and modifier 80 (surgical assistant). Modifier selection depends on specific case circumstances and must be supported by operative documentation.

Is CPT 22558 bundled with bone graft codes?

No, bone graft harvesting and placement can be billed separately with CPT 22558 using codes 20930-20938 for structural allografts or codes 20936-20937 for morselized autograft, but the operative report must specifically document the graft source, type, and placement to support separate billing.