CurrentUCarePolicy N/A

-50 Bilateral Procedure Modifier

Defines UCare's billing and payment rules for using the -50 bilateral procedure modifier for identical procedures performed on paired organs; applies to professional services across all UCare products.

Policy Summary

PayerUCare

Policy-50 Bilateral Procedure Modifier

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateFeb 17, 2025

Key ActionSubmit bilateral services on one claim line with one unit of service when applicable; UCare will apply multiple procedure payment logic and reductions for non-primary services.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

150% or 100%payment adjustment approaches referenced

all UCare productsproduct applicability

2/17/2025policy review date

0,1,2,3,9Medicare indicators referenced

When -50 Bilateral Modifier Applies and How Payment Is Determined

Bilateral modifier coverage and payment rules

When to append -50 and how payment is determined:

Append -50 when the same surgical procedure is performed on a paired organ (e.g., bilateral tympanostomy CPT 69436 with -50).

Do not append -50 when the CPT/HCPCS code descriptor already states 'bilateral' or 'unilateral or bilateral,' or when services are performed on different areas on the same side of the body (payment already reflects bilateral work).

Payment when Medicare BILAT SURG indicator = 1

If Medicare BILAT SURG indicator = 1, the 150% bilateral payment adjustment applies.
When billed as bilateral (with -50 or reported twice via RT/LT or units=2), base payment on the lower of: (a) the total actual charge for both sides, or (b) 150% of the fee schedule amount for a single code.

Policy Summary

PayerUCare

Policy-50 Bilateral Procedure Modifier

Policy CodePolicy N/A

Change TypeNo material change

Effective DateN/A

Next Review DateFeb 17, 2025

Key ActionSubmit bilateral services on one claim line with one unit of service when applicable; UCare will apply multiple procedure payment logic and reductions for non-primary services.

SourceLink

On This Page

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

Modifier Reporting and Payment Calculations

Modifiers and reportingModifier

-50	Bilateral Procedure Modifier; append when identical procedure performed on both sides of a paired organ
RT/LT or units=2	Alternative reporting methods for bilateral procedures (use may affect payment calculation)

inv-03: Payment cap when BILAT SURG indicator = 1

Payment cap (BILAT SURG = 1)When Medicare BILAT SURG indicator = 1, if the code is billed bilaterally (‑50 or RT+LT or units=2), base payment on the lower of: (a) the total actual charge for both sides, or (b) 150% of the fee schedule amount for a single code.

Claim submissionSubmit services on one claim line with one unit of service or report bilaterally via modifiers/units; payment logic uses the bilateral determination above.

Interaction with other proceduresIf the code is reported as bilateral and with other procedure codes on the same day, apply the bilateral rule prior to other payment considerations.

inv-04: Payment rule when BILAT SURG indicator = 3

Per‑side payment rule (BILAT SURG = 3)When Medicare BILAT SURG indicator = 3, the usual 150% adjustment does not apply; if reported bilaterally (‑50, RT+LT, or units=2), base payment for each side on the lower of: (a) the actual charge for each side, or (b) 100% of the fee schedule amount per side.

Procedure combinationsIf reported as bilateral and with other procedure codes on the same day, determine the fee schedule amount for a bilateral procedure before applying multiple procedure rules.

Reporting methodsPayment applies whether reported with the ‑50 modifier, RT/LT modifiers, or by a 2 in the units field.

Claim Submission and Payment Processing Guidance

Billing Rule

Claim submission and payment logic

Submit bilateral services on one claim line with one unit of service when applicable; UCare will apply multiple procedure payment logic and reductions for non-primary services.

When Medicare BILAT SURG indicator = 1: if billed bilaterally (‑50 or RT/LT or units=2), base payment on the lower of total actual charge for both sides or 150% of the single‑code fee schedule.
When Medicare BILAT SURG indicator = 3 (or 0, 2, 9): if reported bilaterally, base payment for each side on the lower of actual charge for each side or 100% of the fee schedule amount per side.
If the code is reported as bilateral and reported with other procedure codes the same day, apply the bilateral determination before multiple procedure rules as described in the policy.

Key Terms

inv-06: Use when an identical procedure is performed on both sides of a paired organ — the -50 modifier

DefinitionThe ‑50 modifier should be appended when an identical procedure is performed on both sides of a paired organ.

ExampleExample: bilateral tympanostomy (CPT 69436) appended with a ‑50 modifier.

When not to useDo not use ‑50 for procedures on different areas of the same side or when the code descriptor already indicates bilateral/unilateral or bilateral (payment already reflects bilateral work).

inv-07: Medicare Relative Value File (BILAT SURG) indicator

PurposeMedicare Relative Value File 'BILAT SURG' indicator is a numeric flag that determines whether the 150% bilateral payment adjustment applies (indicator '1') or does not apply (indicators '0','2','3','9').

Indicator = 1When indicator = 1, the 150% payment adjustment for bilateral procedures applies (see payment cap rules).

Indicators = 0,2,3,9When indicator = 0, 2, 3, or 9, the usual 150% bilateral payment adjustment rules do not apply; alternate per‑side or standard pricing rules apply as specified.