Fusion · Spine

Anterior cervical discectomy and fusion (ACDF) at a single interspace, performed through a front-of-neck approach with removal of disc material and arthrodesis of adjacent vertebral bodies.

Verified May 8, 2026 · 5 sources ↓

Medicare: $1,604.91
Total RVUs: 48.05
Global, days: 90
Region: Spine

Drawn from CMSThejns

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Specify the exact interspace(s) treated (e.g., C5-C6) — vague level documentation triggers audits
Document conservative treatment failure (physical therapy, injections, medications) and duration prior to surgical decision
Operative note must name the approach (anterior vs. anterolateral) and describe discectomy, neural decompression, and fusion technique
Identify graft type used (autograft, allograft, synthetic) to support add-on graft codes billed alongside 22551
Record pre- and intraoperative neurological status and imaging correlation to support medical necessity
For instrumentation, document implant type and fixation method to justify separately billed hardware codes

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 LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 22551 covers a single-level ACDF: the surgeon approaches the cervical spine from the front of the neck, removes the offending disc, decompresses neural structures, and fuses the adjacent vertebral bodies. This is the index code for the first interspace. If a second contiguous level is fused during the same session, add 22552 for that additional interspace. 22552 is an add-on code and does not carry its own global period.

The 90-day global period means all routine post-op management through day 90 is bundled — no separate E/M billing unless you append modifier 24 and document an unrelated problem. The day-before preoperative visit is also included. Separate billing for instrumentation (e.g., 22845 for anterior instrumentation) and bone grafting (e.g., 20930–20938 series or structural allograft codes) is appropriate when those services are performed and documented, but check current NCCI edits for each pairing before submitting.

Medicare coverage for 22551 requires a supported ICD-10-CM diagnosis — cervical disc disorders with myelopathy (M50.01–M50.03) and radiculopathy (M50.11, M50.121–M50.123) are primary drivers, along with spinal stenosis (M48.02–M48.03) and pyogenic disc infection (M46.32–M46.33). Conservative treatment failure must be documented in the record before CMS considers the fusion medically necessary in most non-emergency presentations.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	24.38
Practice expense RVU	15.43
Malpractice RVU	8.24
Total RVU	48.05
Medicare national rate	$1,604.91
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	$1,604.91
HOPD (APC 5115) Hospital outpatient department	$13,116.76
ASC (PI J8) Ambulatory surgical center (freestanding)	$9,030.96

Common denial reasons

The recurring reasons claims for CPT 22551 get rejected.

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

Missing or insufficient documentation of conservative treatment failure before surgery
ICD-10-CM diagnosis code does not match covered indications listed in the applicable LCD (e.g., non-specific neck pain without radiculopathy or myelopathy)
Billing 22551 and 22552 without recognizing 22552 as an add-on — submitting 22552 with modifier 51 is incorrect
Operative note lacks specificity on level treated, approach, or neural decompression steps — common audit flag post-2015 CMS coding review
Global period violations: separate E/M billing within 90 days without modifier 24 and documentation of an unrelated condition

Frequently asked questions

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

01When do I add 22552 to a 22551 claim?

Bill 22552 for each additional contiguous interspace fused during the same session. It is an add-on code — do not append modifier 51, and do not bill it as a standalone code. Two-level ACDF bills as 22551 + 22552; three-level bills as 22551 + 22552 x2.

02Can instrumentation codes be billed with 22551?

Yes. Anterior cervical instrumentation (e.g., 22845) and bone graft codes are separately billable when performed and documented. Verify current NCCI PTP edits for each pairing — some combinations require modifier 59 or an X-modifier to bypass the edit.

03What ICD-10 codes support medical necessity for 22551 under Medicare?

CMS billing and coding articles list cervical disc disorder with myelopathy (M50.01–M50.03), radiculopathy (M50.11, M50.121–M50.123), cervical spinal stenosis (M48.02–M48.03), and pyogenic disc infection (M46.32–M46.33) as covered diagnoses. Non-specific neck pain without neural compromise typically does not meet medical necessity.

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

Routine post-op visits, wound checks, and stitch removal through day 90 are bundled. If you see the patient for a problem unrelated to the fusion — say, a new cardiac complaint — bill the E/M with modifier 24 and document the unrelated nature clearly in the note.

05Is modifier 62 appropriate for co-surgeon billing on ACDF?

Modifier 62 applies when two surgeons of different specialties each perform distinct portions of the procedure and both dictate separate operative notes documenting their individual work. It is used in some neurosurgery/orthopedic co-surgery arrangements, but payer policy varies — confirm with the specific payer before billing.

06What changed after the 2015 CMS ACDF coding audit?

Post-audit research published in the Journal of Neurosurgery: Spine found documentation patterns shifted significantly after CMS scrutiny of single-level ACDF claims. Operative notes became more detailed regarding level specification, decompression steps, and approach. Audit teams continue to flag notes that rely on boilerplate or fail to name the specific interspace.

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 (anterior vs. anterolateral), interspace treated by name (e.g., C5-C6), disc removal and neural decompression steps, graft type and source, and any instrumentation placed — all from the surgeon's dictation. That structured capture prevents the vague operative note language ('standard anterior approach, one level') that audit teams flag and that MACs cite when downgrading or denying ACDF claims.

See how Mira captures CPT 22551 documentation