CPT 22585Surgery

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CPT 22585 covers anterior interbody arthrodesis, a minimally invasive spinal fusion procedure where a surgeon removes a damaged disc and fuses vertebrae together from the front of the spine. This is an add-on code used for each additional interspace beyond the primary fusion level.

Showing rates for

National Average

Base Medicare rate

$314.41

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

5.52

PE RVU (NF)

2.6

MP RVU

1.6

Total RVU

9.72

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

NCCI bundling edits

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Billing tips

Always verify the primary arthrodesis code (22558, 22551, or 22554) is billed first; 22585 will auto-deny if submitted without an appropriate primary code on the same claim
Impact: Prevents 100% denial and claim rework; ensures timely payment of $314.41 per additional level
Document each interspace explicitly in operative notes with specific anatomical levels (e.g., L4-L5, L5-S1) and report one unit of 22585 per additional level beyond the first
Impact: Proper unit reporting for 3-level fusion adds $628.82 (2 units of 22585) versus single-level payment
Submit instrumentation codes separately (22845, 22853, 22854) as these are not included in 22585; each level instrumented qualifies for additional reimbursement
Impact: Can add $800-$2,000+ per case depending on instrumentation complexity
For facility coding, ensure ICD-10 codes support medical necessity for multilevel fusion; M51.06-M51.07 (lumbar radiculopathy with specific levels) provide stronger support than general back pain codes
Impact: Reduces medical necessity denials by 40-60% and supports payment for all reported levels
Bundle bone graft harvesting (20936, 20937, 20938) on same claim if autograft is obtained; structural allografts and cages are separately reportable
Impact: Autograft harvesting adds $150-$400; proper documentation prevents bundling denials
Review NCCI edits quarterly; 22585 has specific bundling rules with imaging guidance codes (76000, 77003) that may or may not be separately payable depending on payer
Impact: Prevents denials for incorrectly unbundled services; protects against audit recoupment

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 22585 in 2025?

The 2025 Medicare national average payment for CPT 22585 is $314.41 for both facility and non-facility settings. This rate is based on 9.72 total RVUs multiplied by the 2025 conversion factor of 32.3465. Actual payment may vary based on geographic locality adjustments.

Can CPT 22585 be billed alone or does it require a primary code?

CPT 22585 is an add-on code and cannot be billed alone. It must be reported with a primary anterior arthrodesis code such as 22558 (lumbar), 22551 (cervical below C2), or 22554 (cervical C1-C2). Billing 22585 without a qualifying primary code will result in automatic denial.

How many times can I bill CPT 22585 for a multilevel fusion?

You can bill CPT 22585 once for each additional interspace beyond the first level. For example, a three-level anterior fusion would include one primary code (22558, 22551, or 22554) plus two units of 22585. There is no CMS-imposed limit, but medical necessity must support each level treated.

What is the difference between CPT 22585 and 22632?

CPT 22585 is used for anterior approach interbody arthrodesis at each additional interspace, while 22632 is used for posterior or posterolateral arthrodesis at each additional segment. The key distinction is the surgical approach: 22585 is for anterior procedures (ALIF, ACDF), whereas 22632 is for posterior approaches (PLIF, TLIF).

Does CPT 22585 include instrumentation and bone graft?

No, CPT 22585 covers only the arthrodesis procedure itself with minimal discectomy. Instrumentation (screws, rods, plates) should be reported separately using codes 22845, 22853, or 22854. Bone graft harvesting and structural grafts are also separately reportable with appropriate codes (20936-20938 for autograft, +20930 for allograft).

What documentation is required to support billing CPT 22585?

Documentation must include specific anatomical levels treated, description of anterior approach, discectomy performed at each level, type of interbody device placed, and medical necessity for multilevel fusion. The operative note should clearly differentiate work performed at each interspace to justify each unit of 22585 billed.

What are common denial reasons for CPT 22585 and how can they be prevented?

Common denials include missing primary code, insufficient medical necessity documentation for multiple levels, incorrect unit billing, and global period issues. Prevent denials by always billing with appropriate primary code, documenting each level clearly in operative notes, using specific ICD-10 codes for each level, and applying correct modifiers for returns to OR during global periods.