Insert spine fixation device
CPT 22845 covers the insertion of a spinal fixation device, which is hardware implanted to stabilize the spine during fusion surgery. This is an add-on code used alongside primary spine fusion procedures.
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
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
NCCI bundling edits
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Billing tips
Always bill 22845 as an add-on to primary arthrodesis codes (22554, 22558, 22585, 22586) - never as a standalone code
Impact: Prevents automatic denial; 22845 billed alone results in 100% claim rejection
Verify the number of vertebral segments instrumented matches the code descriptor (2-3 segments); use 22846 for 4-7 segments or 22847 for 8+ segments
Impact: Undercoding by using 22845 for 4+ segments loses $381-$762 in potential reimbursement per case
Document specific hardware details including manufacturer, device type, screw sizes, and exact vertebral levels instrumented in operative report
Impact: Comprehensive documentation reduces audit risk by 65% and supports medical necessity for hardware reimbursement
When billing bilateral procedures, ensure operative notes clearly indicate anterior approach instrumentation versus posterior (which uses different code series 22840-22844)
Impact: Prevents incorrect code assignment that can result in $200-400 payment variance and potential fraud allegations
For revision cases, append modifier 22 with detailed documentation of increased complexity, scar tissue dissection, and additional operative time
Impact: Can increase reimbursement by $140-350 (20-50% increase) when properly documented and justified
Submit claims with appropriate ICD-10 codes indicating spinal instability, failed fusion, or deformity to establish medical necessity
Impact: Reduces denial rate from 25% to under 8% when diagnosis codes clearly support instrumentation necessity
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