Biopsy soft tissue of back

CPT code 21920 covers a biopsy procedure where a doctor removes a small sample of soft tissue from your back to examine it for disease, usually to check for cancer, infection, or other abnormalities.

Showing rates for

National Average

Base Medicare rate

$247.13

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

2.11

PE RVU (NF)

5.19

MP RVU

0.34

Total RVU

7.64

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

NCCI bundling edits

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Billing tips

Always verify place of service code: POS 11 (office) triggers $247.13 non-facility rate, while POS 22 (hospital outpatient) triggers $152.03 facility rate
Impact: $95.10 difference in Medicare reimbursement makes accurate POS coding worth $9,510 per 100 procedures
Document exact anatomic location within back (upper, middle, lower, paraspinal, midline) and depth of tissue sampled (subcutaneous vs muscular vs fascial) to defend against downcoding
Impact: Prevents downcoding to unlisted or lower-value codes; protects full $247.13 reimbursement
When image guidance is used, report appropriate imaging code separately (76942 for ultrasound, 77002 for fluoroscopy) as these are not bundled with 21920
Impact: Additional $50-150 reimbursement for imaging guidance when properly documented and medically necessary
Submit pathology report with claim when possible, especially for commercial payers, to establish medical necessity and reduce denial rates
Impact: Reduces initial denial rate by approximately 15-25% based on payer; accelerates payment by 7-14 days
For needle biopsies, ensure documentation specifies core needle technique versus fine needle aspiration, as FNA may be coded differently (10021)
Impact: Correct code selection prevents claim rejections and potential $100-200 payment variance
When multiple biopsies are performed at separate back locations, append modifier 59 to additional units and document distinct anatomic sites clearly
Impact: Preserves payment for additional sites; potential $247.13 per additional documented site versus $0 if bundled

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 21920 in 2025?

Medicare pays $247.13 for CPT 21920 in non-facility settings and $152.03 in facility settings based on the 2025 national average rate. The facility rate is lower because the hospital receives separate payment for overhead costs and supplies.

What is the difference between CPT 21920 and other soft tissue biopsy codes?

CPT 21920 is specific to soft tissue biopsies of the back anatomic region. Other codes cover different body areas: 20206 for muscle biopsy (any site), 11102-11107 for skin/subcutaneous lesions, and other 209xx codes for specific anatomic regions like shoulder or pelvis. Correct code selection depends on precise anatomic documentation.

How many RVUs is CPT code 21920 worth?

CPT 21920 has 7.64 total RVUs, consisting of 2.11 work RVUs, 5.19 non-facility practice expense RVUs (2.25 facility), and 0.34 malpractice RVUs. The RVU values are multiplied by the 2025 conversion factor of 32.3465 to calculate Medicare payment.

Can I bill an E/M code with CPT 21920 on the same date of service?

Yes, you can bill an E/M service with 21920 on the same date if it represents a significant, separately identifiable service beyond the usual pre-procedure evaluation. Append modifier 25 to the E/M code and document the separate clinical work clearly in your note, such as evaluation of other conditions or comprehensive new patient assessment.

What diagnosis codes support medical necessity for CPT 21920?

Common supporting ICD-10 codes include R22.2 (localized swelling/mass/lump of trunk), D48.1 (neoplasm of uncertain behavior of connective tissue), C49.6 (malignant neoplasm of connective tissue of trunk), M79.3 (panniculitis), and specific codes for suspected or known conditions requiring tissue confirmation. Documentation must link the biopsy to clinical findings or imaging abnormalities.

Is imaging guidance included in CPT 21920 or billed separately?

Imaging guidance is not included in CPT 21920 and should be billed separately when used. Report 76942 for ultrasound guidance, 77002 for fluoroscopic guidance, or 77021 for CT guidance. Documentation must support medical necessity for image-guided approach, typically based on lesion depth, size, or proximity to critical structures.

What is the global period for CPT 21920?

CPT 21920 has a 10-day global period (global surgery indicator 010), meaning routine post-procedure care for 10 days after the procedure is included in the payment. Separate E/M services during this period require modifier 24 (unrelated) or 25 (significant, separately identifiable) with clear documentation of why the service exceeds normal post-procedure care.