Fusion · Spine

Posterior segmental spinal instrumentation spanning 13 or more vertebral segments, reported as an add-on to the primary spinal procedure.

Verified May 8, 2026 · 5 sources ↓

Medicare: $875.10
Total RVUs: 26.2
Global, days
Region: Spine

Drawn from CMSMedtronicSrsIsass

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Explicit segment count (13 or more) documented in the operative note — vague language like 'multilevel' is insufficient
Instrumentation type specified by name (e.g., pedicle screws, dual rods, hooks, sublaminar wires)
Primary procedure code identified and documented as the basis for this add-on
Spinal levels instrumented listed individually (e.g., T2–L5, T4–pelvis) with anatomic landmarks
Separate documentation for pelvic fixation if 22848 is also billed
Graft type noted (allograft, local autograft) even if those codes carry zero RVU weight
Two-surgeon roles documented separately in each surgeon's operative note if modifier 62 is used

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 76 Repeat, same physician 77 Repeat, another physician 80 Assistant surgeon AS PA/NP/CNS assistant

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 22844 covers placement of posterior segmental instrumentation — pedicle screws, dual rods, hooks, sublaminar wires, or similar constructs — across 13 or more vertebral segments. This is the highest-tier code in the 22842–22844 family, triggered by long-construct cases such as adult deformity correction, early-onset scoliosis with growing-rod systems (including VEPTR spanning T2-pelvis), or multilevel fusion for trauma or tumor. Segment count determines which instrumentation add-on code applies: 3–6 segments = 22842, 7–12 = 22843, 13+ = 22844.

Because 22844 is a ZZZ add-on code, it carries no independent global period and must always be reported alongside the primary procedure code (e.g., posterior arthrodesis 22800–22819). It is modifier 51 exempt — do not append modifier 51 to 22844 on the claim. When pelvic fixation with iliac screws is also placed, report 22848 in addition to 22844. Allograft (20930) and local autograft (20937) carry no RVU weight but are still reported for complete documentation of graft use.

NCCI edits have historically created friction for the 22842–22844 family. ISASS formally challenged CMS edits that caused carriers to deny these codes even when submitted with appropriate modifiers. If you're seeing Medicare denials despite correct modifier use, that pattern is documented and supports an appeal referencing NCCI policy manual guidance and the ISASS advocacy record. Verify current edit status with your MAC before assuming a denial is final.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	16.01
Practice expense RVU	5.32
Malpractice RVU	4.87
Total RVU	26.2
Medicare national rate	$875.10
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	$875.10

Common denial reasons

The recurring reasons claims for CPT 22844 get rejected.

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

Modifier 51 appended to 22844 — it is modifier 51 exempt and some clearinghouses auto-flag this as an error
NCCI edit denials from Medicare carriers not correctly implementing modifier overrides for 22842–22844; appeal with NCCI policy manual reference
Segment count not explicitly stated in the operative note, so the payer downcodes to 22843 or 22842
Billed without a primary procedure code — 22844 is an add-on and cannot stand alone on a claim
Modifier 62 denied because each surgeon's operative note does not independently document their distinct portion of the work

Frequently asked questions

Source · Generated from the editorial pipeline, verified against 5 cited references ↓

01Is 22844 an add-on code, and can it ever be billed alone?

22844 is always an add-on. It must be reported with a primary spinal procedure — typically an arthrodesis code from the 22800–22819 range. Billing it alone will result in a claim rejection.

02Do I append modifier 51 to 22844?

No. CPT 22844 is modifier 51 exempt. Appending modifier 51 is incorrect and can trigger a claim edit. The same exemption applies to 22848 when billed alongside 22844.

03What is the segment threshold that distinguishes 22844 from 22843?

22843 covers 7–12 vertebral segments; 22844 applies at 13 or more. The operative note must state the count explicitly — 'multilevel' or 'long construct' language is not sufficient for audit defense.

04Can two surgeons each bill 22844 for a co-surgery?

Yes, with modifier 62. Both surgeons must document their distinct operative contributions in separate notes. The code set supports co-surgery when the complexity of a long-construct deformity case warrants two primary surgeons.

05Why are Medicare carriers sometimes denying 22844 even with correct modifiers?

ISASS documented in 2019 that some CMS carriers were not correctly implementing NCCI edits for 22842–22845, denying claims even with appropriate modifier use. If you hit this pattern, appeal citing the CMS NCCI Policy Manual and the documented ISASS advocacy record with CMS.

06If I also place iliac pelvic fixation, do I report that separately?

Yes. Report 22848 (pelvic fixation, other than sacrum) in addition to 22844. Both are modifier 51 exempt. The SRS coding guidance explicitly lists this combination for VEPTR and growing-rod constructs reaching the pelvis.

07Should I report graft codes like 20930 or 20937 alongside 22844?

Report them for complete documentation of graft use, but understand that 20930 and 20937 carry no assigned RVU weight and will not add to reimbursement. They still serve as a record of materials used and may be relevant for implant cost tracking.

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 instrumentation type, individual spinal levels instrumented, and total segment count from dictation — the three elements auditors check first on 22844 claims. When the operative note specifies '13 or more segments' explicitly alongside the primary fusion code, it prevents downcoding to 22843 and blocks the most common NCCI-related denial pattern.

See how Mira captures CPT 22844 documentation