Surgical removal of the first and/or cervical rib combined with sympathectomy, performed to relieve thoracic outlet syndrome or related neurovascular compression.

Verified May 8, 2026 · 5 sources ↓

Medicare: $666.01
Total RVUs: 19.94
Global, days: 90
Region: Shoulder

Drawn from CMSBedrockbillingAAPCAAOS

Documentation requirements

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

Source · Editorial brief grounded in 5 cited references ↓

Preoperative diagnosis with specificity — first rib anomaly, cervical rib, or thoracic outlet syndrome variant (neurogenic, vascular, venous); ICD-10 must match.
Operative note must name the surgical approach (transaxillary, supraclavicular, posterior) — notes stating 'standard approach' draw audit scrutiny.
Explicit documentation that sympathectomy was performed: level(s) of the sympathetic chain divided, extent of resection, and operative indication (e.g., hyperhidrosis, vasospasm, CRPS).
Intraoperative findings confirming rib anomaly or compression pathology — imaging correlation (CT, MRI, or chest X-ray) referenced in the note.
Documentation of failed conservative treatment or vascular/neurological urgency supporting surgical necessity.
If modifier 22 is appended for increased complexity, a separate attestation paragraph quantifying the additional time and difficulty is required.

Applicable modifiers

Modifiers commonly billed with this code.

Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual

22 Increased complexity 24 Unrelated E/M during global 25 Significant separate E/M 51 Multiple procedures 57 Decision for surgery 58 Staged or related 59 Distinct service 62 Co-surgeons 78 Unplanned return — related 79 Unrelated during global 80 Assistant surgeon LT Left side RT Right side

What this code covers

Source · Editorial summary grounded in 5 cited references ↓

CPT 21616 describes excision of the first rib and/or a cervical rib paired with sympathectomy — division of the sympathetic nerve chain — in a single operative session. The procedure addresses thoracic outlet syndrome (TOS), cervical rib anomalies, or refractory sympathetically mediated conditions such as hyperhidrosis or complex regional pain syndrome when conservative management has failed. Because both the bony decompression and the sympathetic chain interruption are included in the single code, billing them separately is incorrect and will trigger bundling edits.

The 90-day global period covers all routine pre- and postoperative visits, wound checks, and staple/suture removal through day 90. Any E/M service in the global window for an unrelated condition requires modifier 24; if the decision for this surgery was made at a same-day or day-before visit, append modifier 57 to that E/M. Staged or planned return procedures in the global period take modifier 58; an unplanned return to the OR for a related complication takes modifier 78.

NCCI edits bundle over 1,000 code pairs into 21616, including select nerve block codes (e.g., 64466, 64467) when performed at the same session. Modifier indicator '1' on those pairs means a modifier can unlock separate payment if the services are genuinely distinct and documented accordingly. Site of service matters: HOPD and ASC payment rates differ substantially — see the site-of-service comparison table on this page.

RVU & reimbursement

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

Source · CMS Physician Fee Schedule, RVU26A · January 2026

Work RVU	12.37
Practice expense RVU	4.41
Malpractice RVU	3.16
Total RVU	19.94
Medicare national rate	$666.01
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	$666.01
HOPD (APC 5114) Hospital outpatient department	$7,413.38
ASC (PI G2) Ambulatory surgical center (freestanding)	$3,695.53

Common denial reasons

The recurring reasons claims for CPT 21616 get rejected.

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

Medical necessity not established — payer requires documented failure of conservative treatment and objective imaging or vascular studies prior to approval.
ICD-10 mismatch or insufficient specificity — coding thoracic outlet syndrome without laterality or without distinguishing neurogenic from vascular type triggers edits.
Unbundling the sympathectomy component as a separate code when it is inherent to 21616 and already captured in the single code.
Bundling denials when nerve block codes (e.g., 64466, 64467) are billed same-day without a modifier and without documentation of a distinct, separate service.
Missing or inadequate operative note detail — particularly absent sympathectomy confirmation or approach documentation, which auditors flag as unsupported billing.

Frequently asked questions

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

01Does 21616 include the sympathectomy, or do I bill that separately?

The sympathectomy is included in 21616. Billing a separate sympathectomy code for the same session is incorrect and will be denied as unbundling.

02Which approach — transaxillary versus supraclavicular — affects the CPT code selection?

21616 is approach-neutral; the code is the same regardless of surgical approach. Document the approach by name in the operative note — audit teams flag notes that omit it — but it does not change the code.

03Can I bill a nerve block (e.g., 64466) performed at the same session?

NCCI bundles 64466 and 64467 into 21616 with a modifier indicator of '1', meaning a modifier can unlock separate payment if the block was a genuinely distinct service with its own documented indication, timing, and medical necessity. Without that documentation, the claim will deny.

04What modifier applies if the patient returns to the OR within 90 days for a related complication?

Use modifier 78 for an unplanned return to the OR for a complication related to the original procedure. Modifier 79 applies if the return procedure is unrelated to 21616. Do not invert them — that is a common and consequential error.

05Is prior authorization typically required for 21616?

Most commercial payers require prior authorization for this procedure. Payer criteria commonly include documented neurogenic or vascular TOS confirmed by imaging or vascular studies, plus failure of conservative management. Verify requirements with each payer before scheduling.

06How does the 90-day global period affect billing for postoperative visits?

All routine follow-up through day 90 is included in the global. To bill a separately payable E/M during that window, the visit must address a condition unrelated to 21616 (modifier 24) or represent a significant, separately documented problem beyond routine post-op care.

07Can 21616 be billed bilaterally?

Bilateral first-rib resection in a single session is rare but not impossible. If performed, append modifier 50 and ensure the operative note documents bilateral pathology and separate indications for each side. Some payers require two line items with LT and RT instead of modifier 50 — verify payer preference.

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 operative approach by name, the anatomic extent of rib resection, the specific level(s) of sympathetic chain divided, intraoperative neurovascular findings, and the clinical indication driving each component. That detail prevents the two most common audit flags on this code: a generic 'standard approach' notation and an operative note that describes rib removal without independently confirming the sympathectomy was performed.

See how Mira captures CPT 21616 documentation