Fusion · Spine

Anterior spinal instrumentation covering 4 to 7 vertebral segments — an add-on code reported alongside the primary spinal procedure.

Verified May 8, 2026 · 8 sources ↓

Medicare: $673.36
Total RVUs: 20.16
Global, days
Region: Spine

Drawn from CMSAAPCSrsGohealthcarellcManagedresourcesinc

Documentation requirements

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

Source · Editorial brief grounded in 8 cited references ↓

Enumerate every vertebral level included in the anterior construct to confirm the 4–7 segment count
Identify the hardware type by name (e.g., anterior cervical plate, rod system) and distinguish it from any interbody cage anchoring fixation
Specify the surgical approach as anterior and document anatomic access (e.g., anterior cervicotomy, anterior retroperitoneal approach)
Record the primary spinal procedure code(s) performed in the same session, since 22846 cannot stand alone
If modifier 59 is appended, document why the anterior instrumentation is distinct from and not integral to any 22853/22854 cage construct
Note any rod manipulation performed (rotation, compression, distraction) as these are included in 22846 and not separately billable

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 58 Staged or related 59 Distinct service 76 Repeat, same physician 77 Repeat, another physician

What this code covers

Source · Editorial summary grounded in 8 cited references ↓

22846 is an add-on code for anterior instrumentation spanning 4 to 7 vertebral segments. It captures placement of hardware such as rods, plates, and screws applied from an anterior approach to stabilize the instrumented segment count. Because it is a ZZZ global add-on, it has no independent global period and is always reported in conjunction with a qualifying primary spinal procedure.

Segment count drives code selection across the anterior instrumentation family: 22845 covers 2–3 segments, 22846 covers 4–7, and 22847 covers 8 or more. Counting must be explicit in the operative note — list every vertebral level spanned by the construct. An ambiguous segment count is the fastest path to a claim hold or audit request.

A critical bundling rule applies when anterior instrumentation serves only to anchor an interbody cage or biomechanical device (22853/22854): that integral fixation is not separately reportable. 22846 is only billable separately when a distinct anterior construct — a stand-alone plate or rod system — exists beyond the cage anchoring hardware. When that separate construct is documented, append modifier 59 to 22846 to bypass the NCCI edit. Modifier 62 (co-surgery) is not permitted on instrumentation add-on codes.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	12.09
Practice expense RVU	4.06
Malpractice RVU	4.01
Total RVU	20.16
Medicare national rate	$673.36
Global period	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	$673.36

Common denial reasons

The recurring reasons claims for CPT 22846 get rejected.

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

Billed without a qualifying primary procedure — 22846 is an add-on code and cannot be submitted alone
Segment count not documented or ambiguous in the operative note, preventing verification of 4–7 level range
Anterior instrumentation integral to cage anchoring (22853/22854) billed separately without modifier 59 and supporting documentation
Modifier 62 appended — co-surgery is not permitted on spinal instrumentation add-on codes
Segment count does not match primary fusion levels documented, triggering a medical necessity review

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 8 cited references ↓

01Is 22846 a standalone code or an add-on?

Add-on only. 22846 carries a ZZZ global period and must be reported alongside a qualifying primary spinal procedure. It cannot be submitted alone.

02When does anterior instrumentation for a cage NOT get coded as 22846?

When the fixation (screws, flanges) exists solely to anchor an interbody biomechanical device reported with 22853 or 22854, that instrumentation is integral to the cage code and is not separately reportable as 22846. Only a distinct, separate anterior plate or rod system beyond the cage anchoring justifies 22846, and modifier 59 is required.

03How do I choose between 22845, 22846, and 22847?

Segment count determines the code: 22845 for 2–3 segments, 22846 for 4–7 segments, 22847 for 8 or more. Count every vertebral level included in the anterior construct and document them by name in the operative note.

04Can I append modifier 62 to 22846 for co-surgery?

No. Modifier 62 is not permitted on spinal instrumentation add-on codes including 22846. If two surgeons are involved, document the primary surgeon's role and the assistant's role using modifier 80 or AS as applicable on the primary procedure code.

05Does 22846 include rod rotation, compression, or distraction?

Yes. Intraoperative rod manipulation — rotation, compression, and distraction used to achieve deformity correction — is included in 22846 and is not separately billable.

06What primary procedure codes can be billed with 22846?

22846 is used in conjunction with a broad range of spinal primary procedures including arthrodesis codes (22548–22558, 22590–22612, 22630, 22633, 22634, 22800–22812), corpectomy codes (63081, 63085, 63087, 63090, 63101, 63102), and decompression codes (63001–63030, 63040–63047, 63050–63056, 63170–63290, 63300–63307), among others.

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 exact vertebral levels spanned by the anterior construct, the hardware name and type, and explicit language distinguishing stand-alone plate or rod instrumentation from any cage-integrated fixation. That prevents the two most common 22846 denials: unverifiable segment count and NCCI bundling conflicts with 22853/22854.

See how Mira captures CPT 22846 documentation