UB04 Field 11: Patient Sex

Introduction

UB-04 Field 11, also known as Box 11, is used to identify the gender of the patient receiving services. Accurate reporting in Box 11 is essential for demographic verification and claims processing by both government and private payers.

Requirements

Requirement Type	Status
Inpatient Requirement	Required
Outpatient Requirement	Required

Billing Tips

Ensure that the gender indicated in Field 11 matches the patient's records on file with the insurance carrier to avoid eligibility denials. While 'M' and 'F' are the primary standards, always verify specific payer requirements regarding 'U' (Unknown) or non-binary designations where applicable.

Code Reference

• M - Male
• F - Female
• U - Unknown