Fusion · Spine

Posterior spinal arthrodesis for deformity correction spanning 13 or more vertebral segments, performed with or without application of a body cast.

Verified May 8, 2026 · 7 sources ↓

Medicare: $2,222.50
Total RVUs: 66.54
Global, days: 90
Region: Spine

Drawn from CMSAAPCMdclarityFindacodeSrs

Documentation requirements

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

Source · Editorial brief grounded in 7 cited references ↓

Operative note must specify the exact number of vertebral segments fused — 13 or more — with named levels (e.g., T2–L4)
Confirm posterior approach explicitly; do not use generic language like 'standard approach'
Document the diagnosis driving deformity correction — scoliosis, kyphosis, or other named structural deformity — with corresponding ICD-10 code
If body cast was applied, document it in the operative or post-op note (it is bundled, not separately billable)
If modifier 62 is used, both surgeons must dictate independent operative notes describing their distinct procedural roles
Document medical necessity: prior conservative treatment, Cobb angle measurements, neurologic status, and functional limitations
Record intraoperative neuromonitoring if billed separately, with distinct provider documentation

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 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon 24 Unrelated E/M during global 25 Significant separate E/M AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 7 cited references ↓

CPT 22804 covers posterior spinal fusion for deformity indications — scoliosis, kyphosis, or related structural abnormalities — when the construct spans 13 or more vertebral segments. This is one of the highest-complexity spine codes in the CPT set, reflecting the operative time, technical demands, and physiologic stress of long-segment posterior instrumented fusion. A body cast applied at the same session is included; do not separately bill casting.

This code carries a 90-day global period. All routine follow-up visits, wound checks, and cast management through day 90 are bundled. Bill modifier 24 for unrelated E&M services during the global, modifier 78 for unplanned return to the OR for a related complication, and modifier 79 for an unrelated return procedure. Staged procedures planned before the index surgery use modifier 58.

Co-surgery (modifier 62) is common on long-segment deformity cases where two surgeons perform distinct portions of the procedure — for example, one managing the exposure and closure while the other handles instrumentation and correction. Both surgeons must dictate separate operative notes detailing their distinct roles. Note that modifier 62 cannot be appended to instrumentation add-on codes; use modifier 80 or AS for the assisting surgeon on those components. The OIG has flagged modifier 62 as an active audit target, so documentation of distinct surgical roles is non-negotiable.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	36.56
Practice expense RVU	19.62
Malpractice RVU	10.36
Total RVU	66.54
Medicare national rate	$2,222.50
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	$2,222.50
HOPD (APC 5116) Hospital outpatient department	$17,913.59
ASC (PI J8) Ambulatory surgical center (freestanding)	$13,933.19

Common denial reasons

The recurring reasons claims for CPT 22804 get rejected.

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

Segment count not explicitly stated in operative report — payer downcodes to a lower-segment fusion code (22800 or 22802)
Modifier 62 billed without distinct operative notes from both surgeons, triggering co-surgery denial
Missing or mismatched ICD-10 deformity diagnosis — payer requires a named deformity (e.g., M41.xx scoliosis) and denies with generic back pain codes
Add-on instrumentation codes denied when modifier 62 is incorrectly appended to those codes instead of 80 or AS
Services billed in the 90-day global period without appropriate modifier 24 or 78, resulting in automatic bundling denial

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 7 cited references ↓

01What distinguishes 22804 from 22800 and 22802?

Segment count is the sole differentiator. 22800 covers posterior deformity fusion up to 6 segments, 22802 covers 7–12 segments, and 22804 covers 13 or more. The operative note must state the exact level count explicitly — payers will downcode if they have to infer it.

02Can modifier 62 be used on instrumentation add-on codes billed with 22804?

No. Modifier 62 applies only to the primary procedure code. Instrumentation add-on codes (e.g., 22842–22844) cannot carry modifier 62. If the co-surgeon participates in instrumentation placement, append modifier 80 or AS to those add-on codes for that surgeon.

03Is a body cast separately billable when applied during the same session as 22804?

No. A body cast applied at the time of surgery is included in 22804 and cannot be billed separately. Document it in the operative note for completeness, but do not add a separate casting code.

04How should a planned staged procedure be billed during the 90-day global period?

Use modifier 58 — staged or related procedure during the postoperative period. This applies when the second procedure was planned before or at the time of the index surgery. Modifier 78 is for unplanned returns to the OR for a related complication, not planned staging.

05What ICD-10 diagnoses support medical necessity for 22804?

Payers expect a named structural deformity: scoliosis (M41.xx), kyphosis (M40.xx), or kyphoscoliosis. Generic low back pain codes alone will not support a 13-segment posterior fusion. Include Cobb angle measurements in documentation to substantiate severity.

06Why is modifier 62 on the OIG Work Plan and what does that mean for billing 22804?

The OIG identified modifier 62 co-surgery billing as an audit target because it reimburses at a higher rate than assistant surgery and is frequently misused. For 22804 cases billed with modifier 62, both surgeons need separate operative notes describing distinct surgical roles. A single shared note with one surgeon listed as co-surgeon is a red flag.

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 fused, the posterior approach, deformity diagnosis with Cobb angle data, and whether a body cast was applied — the specific facts auditors check when a long-segment fusion is billed. For co-surgery cases, the scribe prompts each surgeon to dictate their distinct procedural roles, preventing the single-note documentation pattern that triggers modifier 62 denials under current OIG audit focus.

See how Mira captures CPT 22804 documentation