Application of a shoulder-to-hip body cast extending to both thighs, typically used after surgical correction of congenital spinal deformity or major spinal repair.

Verified May 8, 2026 · 5 sources ↓

Medicare: $364.07
Work RVU: 2.35
Global, days: 0
Region: Spine

Drawn from CMSAAPCChfs

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Diagnosis driving the need for the body cast (e.g., congenital spinal deformity, post-surgical spinal instability) linked to the correct ICD-10 code
Explicit description of cast extent — shoulder to hip with bilateral thigh inclusion — in the clinical or operative note
Medical necessity rationale explaining why bilateral thigh extension was required rather than a shorter cast configuration
Physician attestation or supervising provider documentation if cast was applied by a technician or allied health staff
Date of application, materials used, and any fit or positioning details relevant to post-op immobilization goals

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 25 Significant separate E/M 52 Reduced services 59 Distinct service 73 Discontinued pre-anesthesia 74 Discontinued post-anesthesia 76 Repeat, same physician 77 Repeat, another physician LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 29046 describes the application of an extended body cast that spans from the shoulders down to the hips and encases both thighs. This is among the most extensive body cast configurations in the 29000-series and is used when maximum trunk and lower-extremity immobilization is required — most commonly following surgery for congenital spinal deformity correction or significant spinal reconstruction. The bilateral thigh extension distinguishes this code from 29044 (single thigh) and 29035 (shoulder to hips, no thigh extension).

The 000 global period means no pre- or post-op visits are bundled. E&M services on the same date of service require modifier 25 if the decision to apply the cast was made at that visit. Because this cast type is rare in typical outpatient orthopedic practice, payers will scrutinize medical necessity documentation closely — the operative or clinical note must connect the cast choice directly to the underlying spinal condition being stabilized.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU vs. total RVU

The work RVU (2.35) is the surgeon's own effort — the figure physician pay and productivity targets are built on. The total RVU (10.9) adds practice overhead and malpractice, and is what drives the Medicare payment below.

Work RVU	2.35
Practice expense RVU	8.07
Malpractice RVU	0.48
Total RVU	10.9
Medicare national rate	$364.07
Global period	0 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	$364.07
HOPD (APC 5102) Hospital outpatient department	$285.75
ASC (PI G2) Ambulatory surgical center (freestanding)	$153.62

Common denial reasons

The recurring reasons claims for CPT 29046 get rejected.

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

Medical necessity not established — note lacks a diagnosis or clinical rationale tying the bilateral-thigh cast to the patient's condition
Upcoding concern when 29044 (single thigh) is the documented clinical extent and 29046 (both thighs) is billed instead
Same-day E&M billed without modifier 25, triggering a bundling denial under the 000 global period rules
Payer requires prior authorization for major body casts applied outside a direct surgical encounter and PA was not obtained
Incorrect site-of-service code mismatch between where the cast was applied and what was reported on the claim

Frequently asked questions

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

01What is the difference between 29044 and 29046?

29044 covers a shoulder-to-hip body cast with extension down one thigh. 29046 covers the same cast extended to both thighs. Bill based on what was actually applied and documented — auditors will compare the operative or clinical note to the billed code.

02Can I bill a same-day E&M with 29046?

Yes, but you must append modifier 25 to the E&M code. The 000 global period does not bundle a same-day E&M, but without modifier 25 the visit will deny as included in the procedure payment.

03Is prior authorization required for 29046?

It depends on the payer. Some commercial payers require PA for major body casts, particularly when applied in an outpatient setting outside the immediate surgical encounter. Check the payer's policy before applying the cast electively.

04What diagnoses support medical necessity for 29046?

Post-surgical stabilization following congenital spinal deformity correction is the primary indication. ICD-10 codes for scoliosis, kyphosis, or spinal instability following surgery should be cited. A generic 'back pain' diagnosis will not support medical necessity for this cast extent.

05Does the 000 global period affect billing for cast removal or adjustment?

The 000 global period covers only the day of the procedure. Cast removal, recasting, or any follow-up visit occurring on a different date of service is billed separately and does not require a global period modifier.

06Can 29046 be billed with the surgical procedure that prompted the cast on the same day?

If the cast is applied at the conclusion of a surgical procedure by the same provider, it may be bundled into the surgery by the payer. Review NCCI edits for the specific surgical code pairing. If the cast is genuinely a distinct service performed after the surgical closure, modifier 59 or XS may be appropriate, but verify the edit indicator before appending.

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 cast extent from dictation — specifically whether one or both thighs are included — and maps that directly to the correct code (29044 vs. 29046). It also flags the underlying spinal diagnosis and links it to the medical necessity statement, preventing the most common denial: a cast billed without documented clinical justification for bilateral thigh extension.

See how Mira captures CPT 29046 documentation