Fusion · Spine

Arthrodesis of the clivus-C1-C2 complex via anterior transoral or extraoral approach, with or without odontoid process excision.

Verified May 8, 2026 · 6 sources ↓

Medicare: $1,943.60
Total RVUs: 58.19
Global, days: 90
Region: Spine

Drawn from CMSMdclarityFastrvuAAPCAAOS

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Specify approach by name: transoral or extraoral (retropharyngeal, submandibular, or other named variant)
Document whether odontoid process excision was performed and clinical rationale
If modifier 62 is used, each co-surgeon's note must detail their distinct intraoperative role and contribution
Pre-op imaging (CT, MRI, or flexion-extension X-rays) demonstrating C1-C2 instability or pathology requiring fusion
Diagnosis supported by ICD-10 code — atlantoaxial instability, odontoid fracture, rheumatoid involvement, or tumor as applicable
Operative note must name the specific levels fused: clivus, C1, C2, or subset thereof

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 57 Decision for surgery 58 Staged or related 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 6 cited references ↓

CPT 22548 covers surgical fusion of the upper cervical spine — specifically the clivus, C1 (atlas), and C2 (axis) — approached either through the mouth (transoral) or from outside the oral cavity (extraoral). The procedure may include excision of the odontoid process when instability or pathology requires it. This is one of the highest-complexity spinal fusion codes in the CPT set, reflected in its 90-day global period and substantial RVU weight.

The transoral route is typically reserved for cases where ventral decompression of the cervicomedullary junction is required — atlantoaxial instability from rheumatoid arthritis, os odontoideum, trauma, or tumor. The extraoral approach (retropharyngeal or submandibular) avoids the oral flora contamination risk but demands equivalent anatomical precision. Document which approach was used by name; vague operative notes that omit the access route are a consistent audit flag.

Because the craniovertebral junction involves both neurosurgical and orthopedic or head-and-neck skill sets, co-surgeon billing under modifier 62 is explicitly supported for this code. Each co-surgeon submits the same CPT 22548 with modifier 62 appended; both operative notes must independently document the distinct surgical contributions of each surgeon.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	26.38
Practice expense RVU	20.66
Malpractice RVU	11.15
Total RVU	58.19
Medicare national rate	$1,943.60
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	$1,943.60
HOPD (APC 5115) Hospital outpatient department	$13,116.76
ASC (PI J8) Ambulatory surgical center (freestanding)	$9,493.97

Common denial reasons

The recurring reasons claims for CPT 22548 get rejected.

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

Operative note omits the named approach (transoral vs. extraoral), causing medical necessity review failure
Co-surgeon claims denied when both surgeons' notes fail to document independent, distinct roles
Missing or insufficient pre-operative imaging documentation to support medical necessity at C1-C2
Incorrect modifier use — modifier 80 submitted instead of 62 when two surgeons of equal skill are operating
Add-on instrumentation codes (e.g., 22845 series) denied when not linked with a clear explanation of construct in the operative note

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01Can two surgeons each bill 22548 with modifier 62?

Yes. CPT explicitly supports co-surgeon billing for 22548. Both surgeons append modifier 62 to 22548 and each submits a separate operative note documenting their distinct surgical role. If one surgeon's note merely echoes the other's, payers will deny one claim.

02What is the global period for 22548?

90 days. All routine post-op care, including wound checks and stitch removal, is bundled. Bill unrelated E/M services with modifier 24; use modifier 57 if the decision for this surgery was made the day of or day before the procedure.

03Can instrumentation codes be added to 22548?

Yes — posterior or anterior instrumentation add-on codes (e.g., 22845) are separately reportable when placed at the same session. Document the construct type, levels instrumented, and hardware used in the operative note to support each additional code.

04Is modifier 22 ever appropriate for 22548?

Yes, when operative complexity substantially exceeds the typical case — for example, a revision with prior hardware, severe deformity, or prolonged operative time due to anatomy. Documentation must quantify the extra work: note the time, specific obstacles encountered, and how they altered the procedure.

05How does the transoral vs. extraoral approach affect coding?

22548 covers both approaches under a single code — the approach does not change the CPT. However, document the approach by name in the operative note. If a thoracotomy or other separate access procedure was required for exposure, evaluate whether an additional access code is separately reportable per payer policy.

06What diagnoses typically support medical necessity for 22548?

Atlantoaxial instability (M43.3), os odontoideum, odontoid fracture (S12.1xx codes), rheumatoid arthritis with cervical involvement (M05.0x), and cervicomedullary junction compression from tumor or congenital anomaly are the most common supporting diagnoses. The ICD-10 must match pre-op imaging findings.

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 named surgical approach (transoral vs. extraoral), whether odontoid excision was performed, the specific levels incorporated in the fusion construct (clivus, C1, C2), and each surgeon's distinct intraoperative contribution when co-surgeons are present. That prevents the two most common denials for 22548: vague approach documentation and co-surgeon claims rejected for indistinguishable operative roles.

See how Mira captures CPT 22548 documentation