Deep muscle biopsy

CPT code 20205 covers a deep muscle biopsy, where a physician removes a small sample of muscle tissue from deep within the body for laboratory analysis. This is typically done to diagnose muscle diseases, infections, or other conditions affecting muscle tissue.

Showing rates for

National Average

Base Medicare rate

$292.41

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

2.35

PE RVU (NF)

6.05

MP RVU

0.64

Total RVU

9.04

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

NCCI bundling edits

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Billing tips

Verify and document exact biopsy depth in operative note, specifically noting penetration through fascia to deep muscle compartment to justify 20205 versus superficial codes
Impact: $141.03 difference between 20205 non-facility rate and lower-paying superficial biopsy codes
Bill in non-facility setting when possible if practice has appropriate surgical suite, as non-facility rate ($292.41) is 93% higher than facility rate ($151.38)
Impact: $141.03 additional reimbursement per procedure in non-facility setting
Document medical necessity clearly by including failed prior diagnostic tests, specific clinical indications, and why imaging-guided or superficial techniques were inadequate
Impact: Reduces denial rate by approximately 35-40% based on pre-authorization and medical necessity reviews
Code separately for pathology interpretation if physician performs both biopsy and pathology review, using appropriate 88xx codes for muscle pathology with immunohistochemistry
Impact: Additional $150-$400 in reimbursement for comprehensive muscle pathology evaluation
When multiple biopsies are taken from different deep muscle groups in same session, consider modifier 59 rather than multiple units to avoid bundling
Impact: Ensures payment for each distinct site versus single payment; can add $292.41 per additional qualified site
Submit claims within 30 days of service and include specific muscle group anatomic location (quadriceps, deltoid, gastrocnemius) to expedite processing
Impact: Reduces claim processing time by 40% and decreases information request delays

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Frequently asked questions

What is the Medicare reimbursement rate for CPT 20205 in 2025?

The 2025 Medicare national average reimbursement for CPT 20205 is $292.41 in the non-facility setting and $151.38 in the facility setting. The total RVU is 9.04 with a work RVU of 2.35.

What is the difference between CPT 20205 and 20206?

CPT 20205 is for deep muscle biopsy performed via open incisional technique, while 20206 describes percutaneous needle muscle biopsy. The key distinction is surgical approach and depth: 20205 requires incision through skin, subcutaneous tissue, and fascia to access deep muscle compartments, while 20206 uses a needle through skin without formal incision.

Can CPT 20205 be billed bilaterally with modifier 50?

Yes, modifier 50 can be appended to CPT 20205 when bilateral deep muscle biopsies are performed during the same operative session on corresponding muscles (e.g., bilateral quadriceps). Medicare typically reimburses bilateral procedures at 150% of the unilateral rate.

What documentation is required to support billing CPT 20205?

Required documentation includes medical necessity justification, specific muscle group and anatomic location, explicit documentation of depth with penetration through fascia, surgical approach, anesthesia type, specimen size, and pathology requisition. The operative note must clearly differentiate deep muscle access from superficial techniques.

Does CPT 20205 include ultrasound or imaging guidance?

No, CPT 20205 does not include imaging guidance. If ultrasound or other imaging modalities are used for guidance during the biopsy, these should be coded separately using appropriate imaging codes (such as 76942 for ultrasonic guidance) with modifier 59 if necessary to indicate a distinct procedural service.

What are common diagnosis codes used with CPT 20205?

Common ICD-10 codes include M62.9 (muscle disorder, unspecified), M33.20 (polymyositis), M33.90 (dermatomyositis), G71.0 (muscular dystrophy), G72.9 (myopathy, unspecified), R53.1 (weakness), and R25.2 (cramp and spasm). The diagnosis must support medical necessity for deep tissue sampling.

How many times can CPT 20205 be billed per day?

CPT 20205 can be billed multiple times per day if biopsies are performed on distinct, separate deep muscle groups during the same session. Use modifier 59 or XS to indicate separate anatomic sites. Documentation must clearly identify each distinct muscle group and justify multiple sampling sites.