Biopsy soft tissue of back

CPT code 21925 covers a biopsy of soft tissue in the back—when a doctor removes a small sample of tissue from the back area to test for disease, infection, or cancer.

Showing rates for

National Average

Base Medicare rate

$484.87

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

4.63

PE RVU (NF)

9.36

MP RVU

Total RVU

14.99

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

NCCI bundling edits

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Billing tips

Verify place of service accurately—facility vs non-facility distinction results in $109.33 difference in Medicare reimbursement
Impact: Incorrect POS codes cause automatic downcoding to facility rate, losing 22.5% of potential reimbursement
Document the exact anatomical location and depth of biopsy within the back region (upper, middle, lower; superficial vs deep) to support medical necessity
Impact: Prevents denials for lack of specificity; location documentation supports modifier use and differentiates from adjacent anatomical codes
Link to specific ICD-10 codes indicating mass, lesion, or abnormality (not screening codes) to establish medical necessity for biopsy
Impact: Screening diagnosis codes typically result in automatic denial; appropriate diagnosis linkage ensures payment on first submission
Ensure pathology report is available and correlates with operative note before claim submission for audits
Impact: Missing pathology correlation is a top audit target; having reports ready prevents payment recoupment averaging $484.87 per case
Do not bundle with imaging guidance codes (76942, 77002) when ultrasound or fluoroscopy is used to guide needle placement
Impact: Adds $50-$150 to total reimbursement when imaging guidance is separately documented and medically necessary
Bill separately for complex closure (12031-13102) when biopsy site requires layered closure beyond simple repair
Impact: Complex closure adds $150-$400 depending on size; ensure documentation specifies layered technique and wound dimensions

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 21925 in 2025?

Medicare pays $484.87 for CPT 21925 in non-facility settings and $375.54 in facility settings under the 2025 Physician Fee Schedule. The difference reflects overhead costs covered by the facility in hospital or ASC settings.

How many RVUs is CPT code 21925 worth?

CPT 21925 has a total of 14.99 RVUs, broken down as 4.63 work RVUs, 9.36 non-facility practice expense RVUs (5.98 facility), and 1.00 malpractice RVU. This reflects moderate procedural complexity and resource utilization.

Can CPT 21925 be billed with an E/M code on the same day?

Yes, CPT 21925 can be billed with an E/M code using modifier 25 when a significant, separately identifiable evaluation and management service is performed beyond the typical pre-procedure assessment. Documentation must clearly show the distinct nature of the E/M service.

What is the difference between CPT 21925 and other soft tissue biopsy codes?

CPT 21925 is specific to soft tissue biopsies of the back region. Other anatomical areas use different codes: 20206 for muscle biopsy, 23065 for shoulder soft tissue, 27323-27324 for thigh, and 38500 for lymph node biopsy. Correct anatomical coding is essential for proper reimbursement.

Does CPT 21925 require prior authorization from Medicare or commercial payers?

Medicare typically does not require prior authorization for 21925, but many commercial payers do require authorization, especially for office-based procedures. Always verify payer-specific requirements before scheduling to avoid denials.

What diagnosis codes support medical necessity for CPT 21925?

Medical necessity is supported by ICD-10 codes indicating masses, lesions, or abnormalities requiring tissue diagnosis: D48.1 (neoplasm uncertain behavior connective tissue), R22.2 (localized swelling back), M79.89 (soft tissue disorder), or specific codes for known conditions requiring biopsy confirmation.

Can CPT 21925 be reported bilaterally with modifier 50?

Yes, modifier 50 can be used when biopsies are performed on both left and right sides of the back during the same operative session with medical necessity for bilateral sampling. This typically results in 150% reimbursement, though payer policies vary.