CPT 22846Surgery

Insert spine fixation device

CPT code 22846 covers the insertion of a spinal fixation device, which is a hardware component used to stabilize the spine during or after spinal fusion surgery. This is an add-on code used in conjunction with primary spinal fusion procedures.

Showing rates for

National Average

Base Medicare rate

$734.59

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

12.4

PE RVU (NF)

6.28

MP RVU

4.03

Total RVU

22.71

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

NCCI bundling edits

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Billing tips

Report 22846 per additional vertebral segment, not per instrumentation component. Each level beyond the primary fusion warrants a separate unit of 22846.
Impact: Underbilling by counting hardware pieces instead of segments can result in loss of $734.59 per missed vertebral level in multi-level fusions
Always verify the primary arthrodesis code (22590-22614, 22630, 22633, 22800-22812) is billed first, as 22846 cannot stand alone and will deny without a qualifying base code.
Impact: Standalone billing results in 100% denial; proper sequencing ensures payment of all instrumentation segments
Document the specific vertebral segments instrumented in the operative report with clear anatomical landmarks (e.g., 'L3-L4, L4-L5, L5-S1 instrumented with pedicle screws and rods').
Impact: Vague documentation leads to downcoding or denial; precise segment identification supports medical necessity and can protect $734.59 per level in audits
Check NCCI edits before billing 22846 with other spinal codes; some decompression and osteotomy codes bundle and require modifier 59 for separate reimbursement.
Impact: Failure to append appropriate modifiers results in automatic bundling denial; proper modifier use can recover $734.59 per correctly unbundled segment
In ASC settings, verify the facility has properly reported the implants on the facility claim, as device costs are separate from professional fee reimbursement.
Impact: While professional payment remains $734.59, coordination prevents facility claim denials that could delay or complicate overall case payment
For revision instrumentation cases, append modifier 22 and submit detailed operative notes explaining increased complexity, time, and difficulty compared to primary placement.

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 22846 in 2025?

The 2025 Medicare national average reimbursement for CPT 22846 is $734.59 for both facility and non-facility settings. This rate is based on 22.71 total RVUs (12.4 work RVU, 6.28 PE RVU, 4.03 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

How many times can you bill CPT 22846 on the same claim?

You can bill CPT 22846 multiple times per claim, with each unit representing one additional instrumented vertebral segment beyond those included in the primary arthrodesis code. For example, a three-level fusion might include the primary fusion code plus two units of 22846 for the additional segments.

Can CPT 22846 be billed alone without a primary spinal fusion code?

No, CPT 22846 is an add-on code (modifier 51 exempt) and cannot be billed independently. It must be reported in conjunction with a primary spinal arthrodesis procedure code from the 22590-22614, 22630, 22633, or 22800-22812 series on the same date of service.

What is the difference between CPT 22840 and 22846?

CPT 22840 is the primary code for posterior segmental instrumentation including the first vertebral segment, while 22846 is the add-on code for each additional instrumented segment. For a two-level instrumentation, you would bill 22840 once and 22846 once; for three levels, 22840 once and 22846 twice.

Does CPT 22846 require modifier 51?

No, CPT 22846 is modifier 51 exempt as an add-on code. You should not append modifier 51 when billing multiple units of 22846. The code is designed to be reported multiple times without multiple procedure reductions when appropriately documented.

What documentation is needed to support billing CPT 22846?

Documentation must clearly identify each specific vertebral segment where instrumentation was inserted, the type of hardware used (screws, rods, hooks, plates), the surgical approach, and medical necessity for stabilization. The operative report should explicitly state the anatomical levels and distinguish between segments included in the primary fusion code versus add-on segments.

Is CPT 22846 covered in ASC settings?

Yes, CPT 22846 is covered in ASC settings when performed with appropriate primary spinal fusion codes. The professional reimbursement rate of $734.59 applies in both facility and ASC settings, though facility fees and device costs are billed separately by the ASC on their institutional claim.