Fusion · Spine

Anterior interbody fusion of a single thoracic interspace, including the minimal discectomy needed to prepare the disc space — performed via an anterior or anterolateral approach.

Verified May 8, 2026 · 5 sources ↓

Medicare: $1,598.90
Total RVUs: 47.87
Global, days: 90
Region: Spine

Drawn from CMSMedtronicFastrvuAAPC

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Operative report must specify the anterior or anterolateral approach by name — do not write 'standard approach'.
Document the exact thoracic level(s) fused (e.g., T8-T9) with imaging correlation.
Identify the extent of discectomy as interspace preparation only, distinct from decompressive discectomy.
Record graft type and source (autograft, allograft, synthetic) to support separate graft coding.
If co-surgeon arrangement (modifier 62), each surgeon's operative note must independently describe their distinct portion of the procedure.
List all instrumentation placed with device specifics to support separate instrumentation add-on codes.
Document the medical necessity diagnosis — degenerative disc disease, fracture, tumor, or deformity — with correlating imaging reports.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 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 5 cited references ↓

CPT 22556 covers anterior interbody arthrodesis at a single thoracic level. The approach is anterior or anterolateral — the surgeon accesses the thoracic spine from the front, removes enough disc material to prepare the interspace (minimal discectomy), then fuses the vertebral bodies. Any discectomy performed here is incidental to the fusion prep, not a separate decompressive procedure. If standalone decompression is also performed, that drives a separate coding decision.

This code sits in a family with 22554 (cervical below C2) and 22558 (lumbar). When additional interspaces are fused in the same session, report add-on code 22585 for each additional level. Instrumentation — pedicle screws, anterior plates, interbody devices — is coded separately using the appropriate instrumentation add-on codes (e.g., 22845–22847 for anterior instrumentation, 22840–22844 for posterior). Bone graft codes may also apply depending on graft source and type.

The 90-day global period covers the day before surgery, the operative day, and all routine post-op care through day 90. Complications requiring a return to the OR during that window bill with modifier 78 (related, unplanned) or 79 (unrelated procedure). When two surgeons split the approach and the fusion — a common scenario in thoracic anterior access requiring a vascular or thoracic surgeon — both report 22556 with modifier 62.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	24.08
Practice expense RVU	16.08
Malpractice RVU	7.71
Total RVU	47.87
Medicare national rate	$1,598.90
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	$1,598.90
HOPD (APC 5116) Hospital outpatient department	$17,913.59
ASC (PI J8) Ambulatory surgical center (freestanding)	$13,348.02

Common denial reasons

The recurring reasons claims for CPT 22556 get rejected.

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

Minimal discectomy billed separately as a standalone decompression — it is bundled into 22556 when performed solely to prepare the interspace.
Missing or vague level documentation — payer cannot confirm the thoracic segment without explicit level identification.
Modifier 62 denied because co-surgeon notes are identical or one surgeon's role is not independently documented.
Add-on instrumentation codes denied when the primary 22556 claim processes incorrectly or is missing.
Global period violations — routine post-op visits billed without modifier 24 or 25 within the 90-day window.

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Can I bill the discectomy separately when performed with 22556?

No. The minimal discectomy in 22556 is bundled — it describes interspace preparation, not standalone decompression. Billing a separate discectomy code for this work will be denied under NCCI bundling rules.

02How do I code additional thoracic levels fused in the same session?

Report add-on code 22585 for each additional interspace. It lists separately in addition to 22556 as the primary code and does not require modifier 51.

03When does modifier 62 apply to 22556?

Use modifier 62 when two surgeons each perform a distinct, necessary portion of the procedure — most commonly when a vascular or thoracic surgeon handles the anterior approach and exposure while the spine surgeon performs the fusion. Both surgeons append modifier 62 to 22556, and both must document their individual contributions in separate operative notes.

04Is instrumentation included in 22556?

No. Anterior or posterior spinal instrumentation is coded separately with the appropriate add-on codes (e.g., 22845–22847 for anterior, 22840–22844 for posterior). Interbody device placement may also carry a separate code depending on the device type.

05What global period applies, and what does it cover?

22556 carries a 90-day global period covering the day-before preoperative visit, the operative day, and all routine post-op care through day 90. Unrelated procedures or visits during that window need modifier 79; related unplanned returns to the OR need modifier 78.

06How does site of service affect reimbursement for 22556?

There is a meaningful payment difference between HOPD and ASC settings. See the site-of-service comparison table on this page for current 2026 Medicare rates under the Medtronic 2026 Spinal Procedures Billing and Coding Guide and CMS Physician Fee Schedule 2026.

07Can 22556 be reported bilaterally with modifier 50?

Anterior interbody thoracic fusion is inherently a midline procedure at a single interspace. Modifier 50 is not applicable. If multiple levels are fused, use add-on code 22585 per additional level.

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 approach name, thoracic level(s), extent of discectomy, graft type and source, all instrumentation placed, and each surgeon's distinct role from dictation. That prevents the two most common 22556 denials: vague level documentation and co-surgeon notes that look like copies of each other.

See how Mira captures CPT 22556 documentation