Exc back tum deep 5 cm/>

CPT 21933 covers the surgical removal of a deep tumor from the back that measures 5 centimeters or larger. This is a complex procedure requiring excision of tumors located beneath the muscle layer.

Showing rates for

National Average

Base Medicare rate

$725.86

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

11.13

PE RVU (NF)

8.72

MP RVU

2.59

Total RVU

22.44

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

NCCI bundling edits

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Billing tips

Ensure operative report explicitly documents tumor depth (subfascial/intramuscular) and measures the tumor in three dimensions with the greatest dimension ≥5cm
Impact: Prevents downcoding to 21932 (3-5cm) which pays approximately $150 less, or to subcutaneous codes (21930/21931) which pay $300-400 less
Document separately any complex closure requiring layered repair of multiple fascial planes; consider billing 13100-13102 series for complex closure if criteria are met
Impact: Can add $200-400 in additional reimbursement when closure meets complexity requirements and is not bundled
For tumors requiring frozen section pathology during the procedure, ensure pathology codes (88331-88334) are billed separately by pathology department
Impact: Adds $150-300 in facility revenue; does not affect surgeon reimbursement but supports medical necessity documentation
When excision extends into adjacent anatomical regions (e.g., shoulder, chest wall), document the primary surgical site and consider modifier 22 rather than multiple excision codes
Impact: Modifier 22 approach typically yields 20-30% increase ($145-218 additional) versus risk of denial for unbundling multiple excision codes
Verify tumor size with pathology report measurement; if pathology shows <5cm but operative report documented ≥5cm, include addendum explaining tissue shrinkage in formalin
Impact: Prevents post-payment audits and recoupment; maintains the $725.86 payment versus potential downcode to $575 range
For oncologic cases, ensure ICD-10 code specifies malignant versus benign nature and exact anatomical location (C49.6 for malignant connective tissue of trunk)

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Frequently asked questions

What is the difference between CPT 21933 and 21932?

CPT 21933 is used for deep back tumors measuring 5cm or greater in largest dimension, while 21932 covers deep tumors measuring 3-5cm. The size threshold of 5cm is critical - 21933 reimburses at $725.86 compared to approximately $575 for 21932. Accurate measurement documentation in the operative report is essential to support the correct code.

How much does Medicare pay for CPT 21933 in 2025?

Medicare pays $725.86 for CPT 21933 in 2025 based on the national average rate. This rate applies to both facility and non-facility settings. The code has 22.44 total RVUs (11.13 work RVU, 8.72 PE RVU, 2.59 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Can CPT 21933 be billed bilaterally with modifier 50?

Yes, CPT 21933 can be billed with modifier 50 when separate deep tumors measuring ≥5cm are excised from both sides of the back during the same operative session. Bilateral billing typically reimburses at 150% of the single procedure rate ($1,088.79), though some payers may require separate line items with RT/LT modifiers instead.

What documentation is required to prevent denials for CPT 21933?

Critical documentation includes: pre-operative imaging confirming tumor size ≥5cm and deep location, operative report explicitly stating dissection through deep fascia with tumor located subfascially or intramuscularly, three-dimensional measurements in the operative note, description of tissue planes, and final pathology report. Discrepancies between operative and pathology measurements should be explained.

Is CPT 21933 for benign or malignant tumors?

CPT 21933 applies to excision of both benign and malignant deep tumors of the back measuring ≥5cm. The code descriptor does not distinguish between benign and malignant pathology. However, the ICD-10 diagnosis code must specify the tumor nature (benign vs. malignant), which affects medical necessity determination and potential additional oncologic procedures.

What modifiers are most commonly used with CPT 21933?

The most common modifiers for 21933 are: modifier 22 (increased procedural services due to complexity), modifier 50 (bilateral procedures), modifier 51 (multiple procedures), and modifier 59 (distinct procedural service). Modifier 22 requires extensive documentation but can increase reimbursement by 20-30% when justified by unusual complexity or patient factors.

Can closure codes be billed separately with CPT 21933?

Simple and intermediate closures are included in CPT 21933 and cannot be billed separately. Complex closure (CPT 13100-13102) requiring layered closure of multiple tissue planes may be separately billable in some cases, but faces high bundling scrutiny. Document the complexity and time separately from the tumor excision, and check NCCI edits before billing both codes together.