Surgical · Spine

Surgical removal of a rib head and adjacent transverse process to access the thoracic spine or decompress the spinal cord and nerve roots via a posterolateral approach.

Verified May 8, 2026 · 5 sources ↓

Medicare: $1,216.79
Total RVUs: 36.43
Global, days: 90
Region: Spine

Drawn from CMSKzanowMedtronicCgsmedicare

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Operative note must name the specific thoracic vertebral level(s) approached and confirm rib and transverse process removal.
Indicate the clinical indication — abscess drainage, tumor excision, fracture decompression, or other — that required the costotransversectomy approach.
Document that the costotransversectomy was the definitive procedure, not merely the exposure for a more comprehensive spinal code billed the same day.
Confirm the posterolateral surgical approach by name and describe the extent of bony resection performed.
Note whether intraoperative imaging guidance was used and whether it was integral to the procedure or separately reportable under a distinct CPT code family.
Record neurological status pre- and post-operatively to support medical necessity and establish a baseline for global-period management.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 51 Multiple procedures 52 Reduced services 58 Staged or related 59 Distinct service 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon AS PA/NP/CNS assistant LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21610 covers a costotransversectomy — removal of a rib and the associated transverse process of a thoracic vertebra to achieve lateral access to the thoracic spinal canal or vertebral body. The approach is posterolateral and avoids the need for thoracotomy, making it a common route for draining paraspinal abscesses, excising tumors, or managing thoracic fractures when a direct posterior approach is insufficient.

This code carries a 90-day global period, which covers all routine postoperative management through day 90. Critically, 21610 is designated a 'separate procedure' in CPT — meaning it is bundled into any more inclusive spinal procedure performed at the same level on the same day and cannot be billed separately. When the exposure is part of a thoracic corpectomy or another comprehensive vertebral procedure, 21610 disappears into that code. Fluoroscopy used intraoperatively is also bundled per NCCI Chapter 8 policy; bill 76000 only if CMS explicitly allows separate reporting for that procedure family.

The MUE and NCCI PTP edits for 21610 reflect its 'separate procedure' status. If you are billing 21610 alongside a more definitive thoracic procedure at the same level, expect automatic denial. The only valid standalone scenario is when costotransversectomy is the definitive procedure — not merely the surgical exposure for something else.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	15.51
Practice expense RVU	14.38
Malpractice RVU	6.54
Total RVU	36.43
Medicare national rate	$1,216.79
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	$1,216.79
HOPD (APC 5113) Hospital outpatient department	$3,342.87
ASC (PI A2) Ambulatory surgical center (freestanding)	$1,644.87

Common denial reasons

The recurring reasons claims for CPT 21610 get rejected.

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

Billed alongside a thoracic corpectomy or other comprehensive vertebral procedure at the same level — 21610 bundles into the more inclusive code and is not separately payable.
Missing indication for standalone costotransversectomy; documentation describes the rib removal only as surgical exposure, not as the primary definitive procedure.
Fluoroscopy billed separately (76000) when intraoperative fluoroscopy is integral to the spinal procedure per NCCI Chapter 8 policy.
Global period violation — routine post-op visits billed within the 90-day global without modifier 24 or 25 to establish a separate, unrelated E/M service.
Insufficient operative note detail on bony structures removed and vertebral level, triggering medical necessity or upcoding review.

Frequently asked questions

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

01Can I bill 21610 when I do a costotransversectomy as the approach for a thoracic corpectomy?

No. 21610 is a 'separate procedure' and is included in thoracic corpectomy. Billing both on the same day at the same level will result in denial of 21610. Only the more comprehensive corpectomy code is payable.

02What is the global period for 21610?

90 days. All routine post-op care, dressing changes, and follow-up visits related to the surgery are included. Use modifier 24 for unrelated E/M visits and modifier 79 for unrelated procedures performed during the global window.

03Can I bill intraoperative fluoroscopy separately with 21610?

No. Per NCCI Chapter 8, fluoroscopy (76000) is integral to spinal procedures and is not separately reportable unless a specific CPT instruction explicitly permits it. Do not add 76000 to 21610.

04Does 21610 have a bilateral modifier scenario?

Costotransversectomy is performed at a specific thoracic level unilaterally by definition. Modifier 50 does not apply. If levels differ or procedures are truly distinct, use modifier 59 with supporting documentation.

05What modifier applies if an unplanned return to the OR is needed for a complication related to the original 21610?

Use modifier 78 for an unplanned return to the OR for a complication directly related to the original costotransversectomy during the 90-day global. Modifier 79 is for an unrelated procedure — do not invert these.

06When is modifier 22 appropriate with 21610?

Modifier 22 applies when the procedure is substantially more work than typical — for example, severe deformity, revision anatomy, or extensive tumor involvement requiring significantly greater effort. Document the added complexity explicitly in the operative note; payers require supporting narrative, not just the modifier.

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 vertebral level, the specific bony structures resected (rib head, transverse process), the surgical approach by name, and the standalone clinical indication from the dictation — ensuring the operative note supports 21610 as a definitive procedure rather than a bundled exposure. That distinction is what prevents denial when payers audit for the 'separate procedure' designation.

See how Mira captures CPT 21610 documentation