CPT 21557Surgery

Resect neck thorax tumor<5cm

CPT code 21557 covers the surgical removal of a tumor in the neck or upper chest (thorax) area when the tumor measures less than 5 centimeters. This is a complex oncologic procedure requiring specialized surgical expertise to safely remove tumors from anatomically sensitive areas.

Showing rates for

National Average

Base Medicare rate

$933.52

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

14.75

PE RVU (NF)

11.06

MP RVU

3.05

Total RVU

28.86

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

Loading bundling edits…

Billing tips

Document precise tumor measurements in three dimensions using pathology gross specimen measurements, not just imaging estimates
Impact: Critical for code selection; tumors ≥5cm require CPT 21558 ($1,163+ reimbursement), undercoding with 21557 results in $230+ revenue loss
Clearly differentiate radical resection (21557) from simple excision (11400-11446 series) by documenting wide margins, depth of dissection, and structures involved
Impact: Simple excision codes reimburse $150-300 versus $933.52 for 21557; inadequate documentation may result in downcoding and $600+ loss
Submit operative report with claim when using modifier 22, including specific documentation of additional time (30+ minutes beyond typical), unexpected complexity, and anatomical challenges
Impact: Modifier 22 claims without documentation have 80%+ denial rate; proper documentation can increase reimbursement by $186-467
Verify anatomical location meets CPT definition of neck/thorax; shoulder girdle tumors may require different codes (23075-23078) based on anatomical boundaries
Impact: Incorrect anatomical coding results in denials requiring resubmission; delays payment by 30-60 days and increases administrative costs
Code reconstruction separately when complex closure, flap, or graft is required (e.g., 15734-15738 for muscle flaps); not bundled into tumor resection
Impact: Reconstruction codes add $400-2,000+ in legitimate additional reimbursement when properly documented and separately billable
Obtain prior authorization from commercial payers for oncologic resections; Medicare does not require PA but document medical necessity clearly

Live Field Datano reports yet

Real billers contribute denial patterns and appeal strategies for this code. Once 5+ reports come in, you’ll see live aggregated data here — the only place this exists, free.

Working with CPT 21557?

Get the free Revenue Protection Toolkit — the denial triggers, modifier pitfalls, and bundling conflicts that quietly cost you reimbursement. Instant download.

Help build the field knowledge

MedPayIQ gets smarter as billers contribute. If you've had this code denied, share what happened so others learn from it. Anonymous, no patient info.

Related actions

Frequently asked questions

What is the Medicare reimbursement rate for CPT code 21557 in 2025?

The 2025 Medicare national average reimbursement rate for CPT 21557 is $933.52 for both facility and non-facility settings. This rate is based on 28.86 total RVUs (14.75 work RVU, 11.06 practice expense RVU, and 3.05 malpractice RVU) multiplied by the 2025 conversion factor of 32.3465.

What is the difference between CPT 21557 and 21558?

The primary difference is tumor size: CPT 21557 is for tumors less than 5 centimeters in greatest dimension, while CPT 21558 is for tumors 5 centimeters or greater. Accurate measurement from pathology gross specimen is critical, as this distinction significantly impacts reimbursement and code selection.

Can CPT 21557 be billed with reconstruction codes?

Yes, complex reconstruction procedures (such as muscle flaps CPT 15734-15738 or skin grafts 15100-15261) are separately billable when medically necessary to close the defect created by tumor resection. Simple layered closure is included in 21557, but complex reconstruction requiring tissue transfer is not bundled and should be coded separately with appropriate documentation.

What documentation is needed to bill CPT 21557 instead of a simple excision code?

Documentation must demonstrate radical resection technique including wide margin excision (typically 1-2cm margins), dissection through multiple tissue planes (skin, subcutaneous tissue, fascia, potentially muscle), removal of tumor with surrounding normal tissue, and pathology confirming neoplastic process. Simple excision codes (11400-11446) involve only removal of lesion with minimal margins and limited depth.

Which medical specialties typically bill CPT code 21557?

CPT 21557 is most commonly billed by surgical oncologists, orthopedic oncologists, general surgeons with oncologic training, thoracic surgeons, and head/neck surgeons. The procedure requires specialized training in oncologic resection principles and familiarity with complex neck and chest wall anatomy.

How do you code bilateral tumor resections in the neck or thorax?

For bilateral procedures involving separate distinct tumors, report 21557 with modifier 50 (bilateral procedure) or report 21557 twice with RT and LT modifiers depending on payer preference. Each tumor must be clearly documented as a separate lesion. Payer policies vary, with some allowing 150% payment and others requiring separate line items at 100% and 50%.

What are the most common reasons for CPT 21557 claim denials?

The most common denials include: insufficient documentation of tumor size leading to disputes about proper code selection, medical necessity denials claiming simple excision would be adequate rather than radical resection, anatomical location disputes regarding whether tumor qualifies as neck/thorax versus adjacent regions, and lack of pathology confirmation supporting neoplastic diagnosis requiring oncologic resection approach.