Fusion · Spine

Posterior arthrodesis of the craniocervical junction, spanning from the occiput through C2, performed to eliminate pathologic motion at the skull-cervical interface.

Verified May 8, 2026 · 9 sources ↓

Medicare: $1,559.15
Total RVUs: 46.68
Global, days: 90
Region: Spine

Drawn from CMSMdclarityHealthcareinspiredllcAAPCSrs

Documentation requirements

What must appear in the operative or office note to support the claim.

Source · Editorial brief grounded in 9 cited references ↓

Operative note must name the exact spinal levels fused — occiput, C1, and/or C2 — not just 'craniocervical junction'
Specify the posterior technique used and confirm a posterior approach was employed (not anterior or combined without separate coding)
Document the type and source of bone graft (autograft, allograft, BMP) with harvest site if autograft was used
Identify all instrumentation placed (occipital plate, lateral mass screws, pedicle screws, rods) to support separate instrumentation code reporting
Record the indication clearly — instability etiology (trauma, rheumatoid, congenital, tumor, degenerative) tied to the ICD-10 diagnosis
Intraoperative imaging or navigation use (fluoroscopy, O-arm, CT-based navigation) should be documented to support separately billable imaging guidance codes
Neuromonitoring notes should reflect baseline and intraoperative changes; if a separate monitoring provider is billing, coordination of care documentation is required

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 59 Distinct service 62 Co-surgeons 76 Repeat, same physician 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon

What this code covers

Source · Editorial summary grounded in 9 cited references ↓

CPT 22590 covers posterior fusion of the craniocervical junction — the region from the base of the skull (occiput) down through the second cervical vertebra (C2). The surgeon approaches from the back of the neck, decortications the posterior elements, and applies bone graft to achieve permanent osseous union across this segment. Indications include craniocervical instability from trauma, degenerative disease, congenital anomalies, rheumatoid involvement of the atlantoaxial complex, or tumor-related destruction.

This is one of the highest-complexity spinal fusion codes in the CPT system, reflecting the surgical difficulty, proximity to the brainstem and vertebral arteries, and nearly universal need for intraoperative neuromonitoring and fluoroscopic or navigation guidance. It carries a 90-day global period. Instrumentation (e.g., occipital plates, cervical pedicle or lateral mass screws, rods) is reported separately using the appropriate spinal instrumentation add-on codes. Bone grafting is similarly reported with the applicable graft code.

Distinguish 22590 from adjacent codes: 22595 covers atlas-axis (C1–C2) fusion only, not extending to the occiput; 22600 covers posterior cervical fusion below C2. If the fusion construct extends from the occiput through C2 and further caudally, each additional level is reported with the appropriate add-on code for the technique used at that segment. Neurosurgery performs the overwhelming majority of 22590 cases per CMS Physician Utilization File data.

RVU & reimbursement

Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	21.22
Practice expense RVU	17.41
Malpractice RVU	8.05
Total RVU	46.68
Medicare national rate	$1,559.15
Global period	90 days

Payment by site of service

Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.

Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026

Setting	Medicare rate (national)
Office (PFS non-facility) Procedure performed in physician's office	$1,559.15
HOPD (APC 5115) Hospital outpatient department	$13,116.76
ASC (PI J8) Ambulatory surgical center (freestanding)	$8,717.99

Common denial reasons

The recurring reasons claims for CPT 22590 get rejected.

Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓

Medical necessity not established — payer requires documented failure of conservative management (bracing, physical therapy) prior to elective stabilization
Operative note describes levels inconsistent with 22590 — note reads 'C1–C2 only' triggering a code mismatch with 22595
Instrumentation codes denied as unbundled when operative note does not clearly describe instrumentation as a distinct service beyond the fusion itself
Bone graft code denied because documentation does not specify graft type or harvest site, making it appear incidental to the arthrodesis
Global period conflict — postoperative services billed without modifier 24 (unrelated E&M) or 78/79 for return-to-OR scenarios within the 90-day window
Missing or mismatched ICD-10 — instability diagnosis not supported by imaging reports referenced in the operative record

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 9 cited references ↓

01What is the difference between 22590 and 22595?

22590 covers posterior fusion from the occiput through C2 — the construct must include the skull base. 22595 is atlas-axis (C1–C2) fusion only, with no occipital involvement. If your construct attaches to the occiput at all, use 22590, not 22595.

02Can instrumentation codes be billed separately with 22590?

Yes. Posterior spinal instrumentation (segmental or non-segmental) is reported separately using the appropriate add-on instrumentation codes. The operative note must individually describe each implant placed to support those additional codes under audit.

03Is modifier 62 appropriate for 22590 when a neurosurgeon and an orthopedic spine surgeon co-operate?

Yes, when two surgeons each perform distinct portions of the procedure and each documents their specific operative contribution, modifier 62 applies to both surgeons' claims. Each surgeon's note must describe their distinct work — a single shared note is an audit target.

04How does the 90-day global period affect post-op billing for 22590?

All routine post-op visits, wound checks, and stitch removals through day 90 are included in the global package. Bill an E&M with modifier 24 only for a new or unrelated problem. An unplanned return to the OR for a related complication (e.g., wound dehiscence at the fusion site) uses modifier 78; an unrelated same-period procedure uses modifier 79.

05Can decompression codes (e.g., from the 63000-series) be billed with 22590 on the same day?

CPT guidelines permit separate reporting of posterior decompression when performed beyond what is required for fusion preparation. However, CMS NCCI edits restrict this for some code pairings at the same spinal level — review current NCCI edits before adding a nervous system decompression code. Many private payers follow CPT rules rather than CMS NCCI policy, so payer-specific LCD review is required.

06What ICD-10 diagnoses most commonly support medical necessity for 22590?

Craniocervical instability (M53.0), atlantoaxial instability (M43.3), fracture of the atlas or axis with instability, rheumatoid involvement of the cervical spine (M05.08 or M06.08), and neoplasm-related destruction of the upper cervical vertebrae are the most frequently accepted diagnoses. The imaging findings supporting instability must be referenced in the operative record.

Sources & references

Editorial content was developed using the following public sources. Last verified May 8, 2026.

Mira AI Scribe

Mira's AI scribe captures the fusion levels (occiput, C1, C2), posterior approach confirmation, graft source and type, and all instrumentation placed — mapping each element to the corresponding CPT code for the surgeon's review before the note is finalized. That prevents the most common 22590 audit flag: an operative note that describes a construct spanning the occiput but codes only a C1–C2 fusion, or one that omits instrumentation detail needed to defend separately billed hardware codes.

See how Mira captures CPT 22590 documentation