Treatment of bone cyst

CPT 20615 covers the treatment of a bone cyst, which is a fluid-filled or fibrous cavity within a bone that requires medical intervention such as injection therapy or aspiration. This is a minimally invasive procedure typically performed to relieve pain, prevent fractures, or promote bone healing.

Showing rates for

National Average

Base Medicare rate

$241.30

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

2.33

PE RVU (NF)

4.84

MP RVU

0.29

Total RVU

7.46

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

NCCI bundling edits

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Billing tips

Always bill imaging guidance separately when used (76942 for ultrasound, 77002 for fluoroscopy) as these are not bundled with 20615
Impact: Additional $50-150 in reimbursement depending on imaging modality; fluoroscopy guidance adds approximately $80-100 to total claim
Verify place of service code matches actual location: POS 22 (outpatient hospital) triggers facility rate of $156.56 while POS 11 (office) or 24 (ASC) may trigger non-facility rate of $241.30
Impact: Incorrect POS coding can result in $84.74 payment difference and potential recoupment audits
Document the specific bone treated and anatomical approach in operative note to support medical necessity and prevent denials for lack of specificity
Impact: Prevents 15-20% of denials related to insufficient documentation; appeals for vague documentation have less than 40% success rate
When treating multiple bone cysts in separate locations, bill each with modifier 59 and link to separate diagnosis codes showing distinct lesions
Impact: Ensures payment for each cyst treatment at approximately $241 each rather than bundling; can represent $241+ in additional revenue per additional cyst
Confirm prior authorization requirements for commercial payers before procedure as some classify this as experimental for certain indications
Impact: Prevents 100% payment denial; retro-authorization success rate is typically below 30% for procedures requiring pre-auth
Bill aspiration material pathology separately (88305) if tissue is sent for histological examination to rule out malignancy
Additional $75-90 in total reimbursement; often overlooked revenue especially when initial imaging is indeterminate

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Frequently asked questions

What is the 2025 Medicare reimbursement rate for CPT 20615?

The 2025 Medicare national average reimbursement for CPT 20615 is $241.30 in the non-facility setting and $156.56 in the facility setting. These rates are based on a total RVU of 7.46 and conversion factor of 32.3465. Actual payment may vary based on geographic locality adjustments.

Can CPT 20615 be billed with image guidance codes?

Yes, CPT 20615 should be billed with appropriate image guidance codes when imaging is used. Code 77002 for fluoroscopic guidance or 76942 for ultrasound guidance are separately billable and not bundled with 20615. Documentation must support the medical necessity and use of imaging throughout the procedure.

How many times can CPT 20615 be billed per year for the same patient?

There is no specific Medicare frequency limitation for CPT 20615, but medical necessity must be documented for each treatment. Most bone cysts require 1-3 injections spaced weeks to months apart. Repeated treatments within short intervals may trigger review, so documentation should clearly support why additional treatments are necessary based on clinical response and imaging findings.

What diagnosis codes are appropriate for billing CPT 20615?

The primary diagnosis codes for CPT 20615 are from the M85.5x series for solitary bone cysts and M85.6x for aneurysmal bone cysts. The ICD-10 code must include the specific bone location (e.g., M85.521 for solitary bone cyst of right humerus). Using nonspecific codes or codes that don't indicate a true cystic lesion may result in denials.

Is prior authorization required for CPT 20615?

Medicare typically does not require prior authorization for CPT 20615, but many commercial payers and Medicare Advantage plans do require pre-authorization. Requirements vary significantly by payer and patient plan. Always verify authorization requirements before scheduling the procedure to avoid payment denials. Some payers may also have step therapy requirements showing conservative management failure.

Can CPT 20615 be billed bilaterally with modifier 50?

Yes, modifier 50 can be appended to CPT 20615 when bilateral bone cysts are treated during the same session, though this clinical scenario is uncommon. Bilateral treatment is typically reimbursed at 150% of the single procedure rate. Each side must be clearly documented with separate medical necessity, and both lesions must meet criteria for treatment.

What is the difference between CPT 20615 and surgical curettage codes?

CPT 20615 is for minimally invasive treatment through aspiration and/or injection, while surgical curettage codes (20240-20245) involve open or arthroscopic removal of cyst lining with bone grafting. Code 20615 has lower reimbursement ($156-241) compared to curettage procedures ($400-800+) but also lower risk and faster recovery. The choice depends on cyst characteristics, patient factors, and prior treatment response.