CPT code 64405: Greater occipital nerve block billing 2026
CPT code 64405 bills a single injection of anesthetic, or anesthetic plus steroi...
Last Updated: Sep 3, 2026
Key takeaways
CPT code 22551 covers anterior interbody arthrodesis below C2, bundling disc space preparation, discectomy, osteophytectomy, and decompression of the cord or nerve roots.
Decompression is what separates 22551 from 22554, so read the operative note before you commit to either code.
Bone graft is billed separately, using 20930 or 20931 for allograft and 20936 through 20938 for autograft.
Add-on code 22552 covers each cervical interspace after the first, and it never carries modifier 51.
M50.12 and M50.22 are parent codes, so the claim needs the sixth character that names the treated level.
CPT code 22551 reports a single-level anterior cervical discectomy and fusion below C2. Its descriptor bundles four services: disc space preparation, discectomy, osteophytectomy, and decompression of the spinal cord or nerve roots. That fourth element is where ACDF claims go wrong.
Decompression is what separates 22551 from 22554, and it is why a separate discectomy code cannot ride alongside it. Bone graft is the mirror error. Graft sits outside the bundle, so a claim without a graft code underbills the case.
What follows covers Medicare rates, add-on codes, modifiers, diagnosis pairing, documentation, and the NCCI edits behind the most common denials.
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Four services live inside CPT code 22551
CPT code 22551 describes arthrodesis, anterior interbody, including disc space preparation, discectomy, osteophytectomy, and decompression of spinal cord and/or nerve roots; cervical below C2.
In the American Medical Association’s CPT code set, it is the primary code for a single-level ACDF performed below C2.
Those four services are one billable unit. Reporting any of them separately at the same interspace is unbundling, and the NCCI edit file will catch it.
- Disc space preparation, including distraction, curettage, and endplate decortication
- Discectomy at the operative level
- Osteophytectomy performed during the same session
- Decompression of the spinal cord and/or nerve roots
Bone graft is not on that list. The descriptor stops at decompression, so grafting earns its own code every time the surgeon performs it. That split is worth pinning above a coder’s desk, because it is where an ACDF claim either underbills or trips an edit.
Three lines the operative note has to carry
Report 22551 when the surgeon reaches the cervical spine below C2 from the front, removes the disc, decompresses the neural structures, and fuses the interspace. Cervical disc herniation, cervical stenosis, and spondylosis with radiculopathy or myelopathy are the usual indications.
Three findings have to be legible in the operative report before anyone codes it.
- Approach. The note names an anterior or anterolateral approach. A posterior approach belongs to a different code family, starting at 22600.
- Level. The note identifies the interspace treated, such as C5-C6. “Cervical below C2” is the anatomic boundary, so work at C1-C2 does not map here.
- Fusion. The note confirms arthrodesis was achieved, and names the graft material or interbody device used.
Miss any one of the three and the payer has grounds to deny or downcode. CMS billing article A59668 sets out the same expectations for Medicare cervical fusion claims.
22551 or 22554? Decompression decides it
The two anterior cervical fusion codes look almost identical on a superbill, and they pay differently. 22551 includes decompression of the spinal cord or nerve roots. 22554 covers the same anterior interbody fusion with minimal discectomy only, done to prepare the interspace rather than to relieve pressure on anything.
So the deciding phrase sits in the operative note, not on the surgical schedule. If the surgeon documents cord or nerve root decompression, the case is 22551. If the note describes clearing just enough disc to seat the graft, it is 22554. Approach settles the first half of the question, and decompression settles the second.
Add-on selection follows the primary code. 22552 pairs with 22551, and 22585 pairs with 22554. Mixing the two families is a rejection, because each add-on is only valid against its own parent code.
What Medicare pays, and why the number moves
Payment for CPT code 22551 depends on the setting and the locality. Verify current figures with the CMS Physician Fee Schedule lookup before billing, because rates reset every January with the MPFS.
The table below shows 2025 national averages.
Geographic Practice Cost Index adjustments move the final allowed amount by locality, so treat a national average as a planning figure.
Practices that bill this code regularly should pull fresh RVU values each January, before the first case of the year is submitted.
The companion codes that ride with 22551
CPT code 22551 rarely stands alone on a surgical claim. Working out which companion codes apply, and in what order, is the single biggest source of ACDF billing errors.
22552 handles every level after the first
22552 is an add-on code and cannot stand alone on a claim. It needs 22551 beside it as the primary code. A two-level ACDF at C4-C5 and C5-C6 is billed as 22551 once and 22552 once. A three-level case is 22551 once and 22552 twice.
Because 22552 is an add-on, modifier 51 does not apply to it. Appending 51 to an add-on code is one of the most reliable ways to earn a manual review.
Cages and plates each get their own line
22853 covers insertion of an interbody biomechanical device, and its descriptor reads “each interspace”. A two-level ACDF with a cage at both levels therefore supports 22853 twice, not once.
22845 covers anterior instrumentation across two to three vertebral segments, which is the usual cervical plate. Both codes sit inside payer-specific bundling policy. Some commercial plans fold one or both into 22551, so read the policy before the claim goes out.
Graft codes are where ACDF claims underbill
Bone graft is billed separately whenever it is performed. The 22551 descriptor never mentions grafting, so none of it is included in the primary code. Which graft code applies depends on the material and where it came from.
- 20930 – allograft, morselized, for spine surgery only
- 20931 – allograft, structural
- 20936 – autograft, local bone obtained through the same incision
- 20937 – autograft, morselized, harvested through a separate incision
- 20938 – autograft, structural bicortical or tricortical, through a separate incision
20936 is the one that gets misread. Local morselized bone taken from the exposure qualifies, and no second incision is required to report it. Only 20937 and 20938 depend on a distinct skin or fascial incision.
Which modifiers CPT code 22551 actually takes
Modifier choice on 22551 comes down to two questions. Who operated, and what else happened on the same date of service?
The ICD-10 codes that carry medical necessity
Every 22551 claim needs an ICD-10-CM diagnosis that explains why the fusion was necessary. The qualifying codes sit in the M47, M48 and M50 ranges of the ICD-10-CM code library.
Your MAC’s Local Coverage Determination names which of them it will actually pay, so check the LCD for your jurisdiction.
Two of those families come with a trap. M50.12 and M50.22 are parent codes rather than billable ones, so a claim carrying either will reject for missing specificity. Add the sixth character that matches the level in the operative note.
M47.812 is the other code worth flagging. It reads “spondylosis without myelopathy or radiculopathy, cervical region”, which is the opposite of what a fusion usually documents. When the note describes radiculopathy, the correct code is M47.22.
Unspecified pain codes rarely clear medical necessity for a surgical fusion. M54.2 for cervicalgia, submitted on its own, will not support 22551.
Before you submit: The six-point documentation check
CMS article A59668 and most MAC LCDs converge on the same short list. Run it before the claim leaves the office, rather than after the denial arrives.
- Approach. The words “anterior” or “anterolateral” appear in the operative report.
- Levels. Each interspace treated is named, for example “C5-C6 discectomy and fusion performed”.
- Decompression. The note describes decompression of the cord or nerve roots, which is what makes the case 22551.
- Graft source and type. Autograft, allograft, or interbody device, with enough detail to pick the right graft code.
- Instrumentation. Device manufacturer, lot number, and implant record for any plate or cage placed.
- Medical necessity. Pre-operative notes, MRI or CT reports, and evidence that conservative treatment failed.
Send the coded claim promptly after surgery. The longer the delay between the operative date and submission, the more likely a missing detail or a timely-filing limit ends the conversation.
Pro Tip
Ask the circulating nurse for the implant sticker sheet before you leave the facility. Cage and plate lot numbers live on those stickers, and they have to match the implant record in the operative note. A mismatch between the two is a leading audit trigger in spine billing.
NCCI edits that quietly bundle work into 22551
The National Correct Coding Initiative publishes column 1 and column 2 pairs that define what already sits inside CPT code 22551.
Those edits update quarterly, so check the current file in CMS’s NCCI edit tables before you unbundle anything.
- Discectomy codes 63075 and 63076. An anterior discectomy at the same level as 22551 is bundled. Do not report it unless the NCCI modifier indicator allows an override and the note supports one.
- Osteophytectomy. Spur removal at the operative level is inside 22551 and is never coded separately.
- Graft codes. 20930 through 20938 are separately payable alongside 22551. Check the current edit file anyway, because individual payer policy can be stricter than NCCI.
- 22552 is an add-on, not an override. It needs no modifier to separate it from 22551. It simply belongs beside 22551 as the second level.
Six errors that get ACDF claims denied
Anterior cervical fusion generates more than its share of surgical denials. These six account for the bulk of them.
- Coding 22551 at C2 or above. The descriptor stops below C2, so fusion at C1-C2 belongs to a different code family. Read the level before you code.
- Dropping 22552 on multi-level cases. A two-level ACDF billed as 22551 alone underbills the second interspace. Audit multi-level operative reports for the missing add-on.
- Adding modifier 51 to an add-on. Modifiers 51 and 22 do not apply to 22552, 22853, or 22845, and appending them triggers system edits.
- Unbundling the discectomy. Reporting 63075 or an osteophytectomy at the same level as 22551 is the classic NCCI hit.
- Skipping the graft code. Grafting is separately reportable, so leaving 20930 through 20938 off a documented graft costs the practice money.
- Coding to a parent ICD-10 code. M50.12 and M50.22 are not billable. The claim needs the sixth character that names the level.
How Pabau keeps spine fusion claims complete
Most spine practices move codes by hand. The surgeon dictates, a coder reads the note, and the codes get retyped into a separate billing system. Every hop is a chance for 22552 to go missing or for an interspace to drift by one level.
Practice management software like Pabau keeps the codes on the record they came from. Its connected claims management attaches CPT and ICD-10 codes to the treatment note itself. The claim is then assembled from what the surgeon documented, not from a second transcription.
Submission runs electronically through Claim.MD in the US. Claims are scrubbed for missing or malformed data on the way out, which catches an absent diagnosis or an empty required field. Coding judgment still belongs to your coder, because scrubbing does not choose modifiers or code pairs for you.
After adjudication, remittance reconciliation and superbill generation sit in the same workflow. That matters most for a practice running several surgeons and expensive implants. Fewer hand-offs mean fewer places for an ACDF claim to drift from the operative record.
Send surgical claims out complete, first time
Pabau keeps CPT and ICD-10 codes on the treatment record. Each claim is scrubbed for missing or malformed data before submission, so complex spine cases leave the practice whole.
Conclusion
CPT code 22551 rewards careful reading of one document. The operative note names the approach, the level, whether the cord or nerve roots were decompressed, and what was grafted. Between them, those four facts pick the primary code, the add-ons, and the graft codes.
Two habits do most of the work. Confirm decompression before you commit to 22551 over 22554, and never let a documented graft leave without 20930 through 20938 beside it. Everything else on this page is detail hanging off those two checks.
The rest is process. When the codes already live on the clinical record, there is less to re-key and less to verify by hand. Book a demo to see how Pabau assembles and scrubs spine fusion claims straight from the operative note.
Continue your research
Fusion documented without decompression? CPT code 22554 walks through the anterior fusion code that applies when the surgeon only prepared the interspace.
Placing a cage at more than one level? CPT code 22853 explains the each-interspace rule and when payers fold the device into the fusion.
Billing the anterior plate as well? CPT code 22845 covers instrumentation across two to three vertebral segments and the policies that limit it.
Working a posterior cervical case instead? CPT code 22600 sets out the posterior arthrodesis code and how it differs from the anterior family.
Chasing a rejection on a fusion claim? Denial codes in medical billing maps the CARC and RARC codes billing teams see most, and what each one asks for.
Frequently asked questions
How long is the global period for CPT code 22551?
Ninety days. CPT code 22551 carries a 090-day global period on the Medicare Physician Fee Schedule. Routine post-operative visits are already paid for inside the surgical fee. Unrelated care in those 90 days needs modifier 24 on the E/M service. An unrelated return to the operating room needs modifier 79.
Does CPT code 22551 need prior authorization?
On the commercial side, usually yes. Most commercial payers and Medicare Advantage plans require prior authorization for cervical fusion, often through a musculoskeletal review vendor. Traditional Medicare fee-for-service generally does not. Get the authorization number on file before the surgery date, because retroactive requests are rarely granted.
What do you bill if the fusion is abandoned mid-case?
The decompression the surgeon actually performed, not 22551. Arthrodesis has to happen for a fusion code to apply. If the disc is removed and the nerve root decompressed but no fusion follows, report 63075 for a single cervical interspace instead. Document why the fusion was stopped.
Who bills the facility side of an ACDF?
The hospital or ASC does, on a claim of its own. Your 22551 covers the surgeon’s professional work only. The facility is paid separately under the MS-DRG, OPPS, or ASC payment system. That is why the fee schedule amount looks small next to the cost of the case.
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