Fusion · Spine

Posterior segmental spinal instrumentation spanning 7 to 12 vertebral segments, reported as an add-on to the primary fusion or decompression procedure.

Verified May 8, 2026 · 6 sources ↓

Medicare: $728.47
Total RVUs: 21.81
Global, days
Region: Spine

Drawn from CMSSrsAAOSSwiftmdsMdclarity

Documentation requirements

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

Source · Editorial brief grounded in 6 cited references ↓

Identify each instrumented vertebral level by name (e.g., T4, T5, ... L1) — vague references to 'multiple levels' will not support the code
Specify the type of segmental fixation used (pedicle screws, hooks, wires, or combination) at each anchor point
Confirm total segment count is 7–12 to distinguish 22843 from 22842 (2–3 levels) or 22844 (13+ levels)
State the surgical approach explicitly — posterior — since approach determines which instrumentation family applies
Document the primary procedure being supplemented (fusion code, decompression, or both) and its corresponding level range
Note any intraoperative findings affecting construct design, such as poor bone quality, anatomical variants, or revision circumstances

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 59 Distinct service 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 6 cited references ↓

CPT 22843 describes the insertion of posterior segmental spinal fixation hardware across 7 to 12 vertebral levels. It is an add-on code, always reported alongside a primary spinal procedure — most commonly a posterior spinal fusion code (e.g., 22800–22819) or a decompression with fusion. Because it is an add-on code, modifier 51 does not apply and should not be appended.

The code sits in a family with 22840 (non-segmental), 22842 (segmental, 2–3 levels), and 22844 (13 or more levels). Level count matters: 22843 requires exactly 7–12 vertebral segments of instrumentation. Miscounting levels — whether from omission in the operative note or confusion between instrumented and fused levels — is the most common reason claims are downcoded or audited. Pedicle screws, hooks, and wires all qualify as segmental fixation, but the operative note must identify each anchor point by level.

Global period is ZZZ, meaning the code inherits the global period of the primary procedure it accompanies. Post-op management is governed by the primary code's global, not 22843 independently. Neurosurgery and orthopedic surgery account for the vast majority of utilization. For early-onset scoliosis and adolescent idiopathic scoliosis cases, NCCI edits restrict simultaneous use of 22840 and 22849 at the same levels — use 22840–22848 when extending instrumentation to a new level.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	13.1
Practice expense RVU	4.4
Malpractice RVU	4.31
Total RVU	21.81
Medicare national rate	$728.47
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	$728.47

Common denial reasons

The recurring reasons claims for CPT 22843 get rejected.

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

Modifier 51 incorrectly appended — 22843 is an add-on code and modifier 51 does not apply; payors may reject or downcode
Level count not supported by operative note — claim asserts 7–12 levels but documentation names fewer anchor points
Billed without a primary fusion or decompression code, causing the claim to reject as an add-on without a host procedure
NCCI bundling conflict when 22840 (non-segmental) is billed simultaneously at the same spinal levels in revision or growing-rod cases
Wrong instrumentation code selected — confusion between 22842, 22843, and 22844 based on miscount of instrumented segments

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 6 cited references ↓

01Is modifier 51 required when billing 22843 alongside a fusion code?

No. 22843 is an add-on code and is modifier 51-exempt. Appending modifier 51 can trigger a denial or reduction. Bill it without modifier 51 alongside the primary fusion code.

02What defines a 'segment' for the 7–12 level count?

Each vertebra with a segmental anchor point (pedicle screw, hook, or wire) counts as one segment. The operative note must name each instrumented level individually. The fused level range and the instrumented level range do not always match — count only instrumented vertebrae.

03Can 22843 be billed with 22840 (non-segmental instrumentation) on the same claim?

Not at the same spinal levels — NCCI edits restrict simultaneous use of 22840 and segmental instrumentation codes at identical levels. In growing-rod revision cases where instrumentation extends to a new level, use the appropriate segmental code (22842–22848) for the new construct.

04What is the global period for 22843?

ZZZ. The code carries no independent global period and inherits the global of the primary procedure. Post-op billing obligations and modifier requirements (24, 25, 79) are governed by the primary code's global, not 22843 separately.

05When is modifier 22 appropriate with 22843?

When the instrumentation required substantially more work than usual — for example, severe deformity requiring intraoperative implant customization, poor bone quality demanding additional fixation points, or a markedly prolonged operative time. The operative note must quantify the added complexity; modifier 22 without supporting documentation will be rejected.

06How does 22843 relate to 22844 in a long scoliosis construct?

22844 covers 13 or more instrumented vertebral segments. If your posterior scoliosis construct spans, say, T4 to L4 (10 vertebrae instrumented), 22843 is correct. If it spans T2 to L4 (13 vertebrae), use 22844. The Scoliosis Research Society confirms a T4–L1 construct (10 vertebrae) maps to 22843.

Sources & references

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

Mira AI Scribe

Mira's AI scribe captures each instrumented vertebral level by name from dictation, records the fixation type (pedicle screw, hook, wire) at every anchor point, and tallies the total segment count to confirm 22843's 7–12 level threshold — not 22842 or 22844. That automatic level audit prevents the most common audit flag on posterior instrumentation claims: a segment count in the claim that doesn't match the named levels in the operative note.

See how Mira captures CPT 22843 documentation