Glossary · Clinical

ACDF (anterior cervical discectomy & fusion)

ACDF (anterior cervical discectomy and fusion) is a spine surgery performed through the front of the neck to remove a damaged or herniated cervical disc and fuse the adjacent vertebrae into a single stable segment. It is one of the most commonly coded neurosurgical procedures and carries a distinct CPT code family introduced in 2011.

Verified May 8, 2026 · 9 sources ↓

Drawn from CMSBeckersascFigeducationMedtronicAAPC

Definition

Source · Editorial summary grounded in 9 cited references ↓

The surgeon makes an incision on the anterior neck, lateral to the trachea, esophagus, and thyroid, to access the cervical spine without disturbing posterior musculature. The disc is removed, the posterior osteophytes are drilled away, the posterior longitudinal ligament is opened to confirm decompression of the spinal cord or nerve roots, and any free disc fragments are extracted. A bone graft or interbody device is then placed in the cleared disc space, and an anterior plate with screws typically stabilizes the construct.

For dates of service from 2011 onward, CPT consolidated the previously separate discectomy and fusion codes into a single bundled family. Code 22551 covers the first cervical interspace when both discectomy (with decompression) and fusion are performed together; add-on code 22552 is appended for each additional contiguous interspace. Anterior instrumentation (plate, rod) is reported separately using 22845–22847 depending on the number of segments spanned. Bone graft use is also reported via its own add-on codes (20930–20938).

ACDF is indicated for cervical disc herniation, spondylotic radiculopathy, myelopathy, or instability that has not responded to conservative care. Most payers, including Medicare under LCD L39799, require documentation of failed conservative treatment and specific clinical findings before authorizing the procedure. Recovery typically spans several weeks, and osseous fusion across the treated levels is generally radiographically evident at three to six months.

Why it matters

Incorrect code selection is the single biggest driver of ACDF claim denials and post-payment audits. Billing the pre-2011 pair (63075 + 22554) for a combined discectomy-and-fusion case is an NCCI policy violation and will be bundled or denied outright. Conversely, reporting only 22554 (fusion without discectomy) when full decompression was performed understates the work performed and leaves legitimate reimbursement on the table. Multi-level cases coded without the correct add-on (22552) for each additional interspace will be paid at a single-level rate. Each of these errors creates either a refund liability or a sustained revenue leak, both of which surface quickly on Medicare RAC or commercial payer audits.

Common mistakes

Where people most often go wrong with this concept.

Source · Editorial brief grounded in cited references ↓

Using the pre-2011 code pair 63075 + 22554 for a standard ACDF that includes both discectomy and fusion — NCCI bundles these when performed at the same interspace in the same session.
Reporting 22554 alone (fusion without decompression) when the operative note documents posterior osteophytectomy, PLL opening, or nerve root decompression — this undercodes the procedure and misrepresents what was done.
Failing to append add-on code 22552 for each additional interspace in a multi-level ACDF (e.g., C4-C5, C5-C6, C6-C7 requires 22551 + 22552 + 22552).
Billing anterior instrumentation codes 22845–22847 when only an interbody device with integral anchoring hardware was used — per NCCI, that anchoring is bundled into 22853/22854 and cannot be separately reported.
Separately reporting fluoroscopy or intraoperative imaging when the operative procedure's code descriptor already includes radiologic guidance, triggering an NCCI PTP edit.
Omitting the bone graft add-on codes (20930–20938) entirely, or choosing the wrong category (allograft vs. autograft, morselized vs. structural) because the operative report was not reviewed carefully before coding.
Submitting the claim without a valid ICD-10-CM diagnosis code that documents the specific cervical level and pathology — CMS returns such claims as incomplete under SSA §1833(e).

Related codes

Codes commonly involved when this concept appears in practice.

CPT

ICD-10

M50.13 M50.20 M50.23 M47.22 M43.22

Modifiers

59 Distinct procedural service XS Separate structure 51 Multiple procedures 26 Professional component

Frequently asked questions

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

01Can 63075 and 22554 ever be billed together for the same interspace after 2010?

No. NCCI policy prohibits reporting both codes for the same interspace in the same session. For a combined discectomy-and-fusion at a single level, use 22551. Reserve 63075 for a standalone discectomy without fusion, and 22554 for a fusion performed without the decompression work described by 63075.

02How do you code a three-level ACDF (C4-C5, C5-C6, C6-C7)?

Report 22551 for the first interspace (C4-C5), then add-on 22552 for C5-C6, and a second add-on 22552 for C6-C7. Append the applicable anterior instrumentation code (22845 for a plate spanning 2–3 segments) and the appropriate bone graft add-on.

03Is the anterior plate always billed separately from 22551?

Only if the plate functions as independent anterior instrumentation — a true rod or plate construct separate from any interbody device anchoring mechanism. If the interbody device's integral end-caps or anchoring tabs constitute the only 'instrumentation,' per NCCI that work is bundled into 22853 or 22854 and cannot be billed separately with 22845–22847.

04What ICD-10-CM codes support ACDF medical necessity for Medicare?

Common supporting diagnoses include cervical disc displacement with radiculopathy (M50.12, M50.13), cervical disc degeneration (M50.22, M50.23), cervical spondylosis with myelopathy (M47.12–M47.13), and cervical spondylosis with radiculopathy (M47.22–M47.23). The diagnosis code must specify the affected level and be supported by documented clinical findings and imaging.

05Can ACDF be performed and billed as an outpatient or ASC procedure?

Yes. Single- and two-level ACDF procedures are increasingly performed in ambulatory surgery centers. ASC facility coding follows CMS OPPS/ASC packaging rules, which differ from physician-side CPT reporting. Providers should verify that NCCI and OPPS packaging edits are reviewed before submission, as certain add-on codes may be packaged under the ASC payment system.

06What documentation must the operative note contain to support 22551 over 22554?

The note must describe decompression work beyond simple disc removal — specifically, drilling of posterior osteophytes, opening of the posterior longitudinal ligament, inspection for free disc fragments, or lateral decompression of nerve roots. Fusion alone (preparing the interspace and placing a graft without this decompression narrative) supports only 22554.

Sources & references

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

Mira AI Scribe

When Mira detects an ACDF operative note, it applies the following logic before surfacing code suggestions: 1. LEVEL COUNT — Mira counts distinct interspaces documented as having both discectomy (with decompression) and fusion performed. The first interspace maps to 22551; each additional contiguous interspace maps to add-on 22552. If only fusion without decompression is documented at a level, that level maps to 22554 or 22585 instead. 2. INSTRUMENTATION CHECK — If the note documents anterior plate and screws placed independently of the interbody device anchoring, Mira flags 22845 (2–3 segments) or 22846 (4–7 segments). If only the interbody device's integral anchoring tabs are mentioned, Mira suppresses the instrumentation add-on to avoid the NCCI bundling violation. 3. BONE GRAFT RECONCILIATION — Mira reads implant/graft documentation to distinguish allograft (20930 morselized, 20931 structural) from autograft (20936 same incision, 20937/20938 separate incision) and surfaces the appropriate add-on code for coder review. 4. NCCI GUARD — If 63075 and 22554 are both present in the draft claim for the same interspace, Mira flags a probable NCCI PTP conflict and recommends replacing the pair with 22551. 5. DIAGNOSIS PAIRING — Mira maps the operative level (e.g., C5-C6) and documented pathology (herniation, spondylosis, myelopathy) to the most specific ICD-10-CM code and requires coder confirmation before finalizing. All suggestions are surfaced as draft recommendations; a credentialed coder must review and approve before submission.

See Mira's approach