Health care providers and billing services use the X12 837 to submit claims for reimbursement to insurance companies and other payers. Triggered by a patient’s receipt of health care services, this transaction set supports detailed documentation of medical, dental, pharmaceutical, and equipment services. The BHT (Beginning of Hierarchical Transaction) segment establishes the claim’s purpose and reference identifiers, while HL (Hierarchical Level) segments organize the provider, subscriber, and patient into a structured hierarchy. The CLM (Health Claim) segment anchors the submission, carrying core details such as the claim reference number, total charges, and place of service.

Consider MediCare Solutions, a multi-specialty physician practice, submitting a claim to Blue Shield Insurance for an office visit, lab work, and a minor surgical procedure. MediCare’s billing department prepares an 837 that identifies the practice using NM1 (Individual or Organizational Name) segments, captures the patient’s demographic data via DMG (Demographic Information) segments, and builds out multiple service lines in Loop 2400 - one for the office visit using an SV1 (Professional Service) segment, another for laboratory services, and a third for the procedure. Each service line includes relevant dates via DTP (Date or Time Period) segments and diagnosis codes via HI (Health Care Information Codes) segments. Blue Shield receives the structured claim, processes it through adjudication, and responds with payment or a request for additional information—allowing MediCare to track reimbursement and reconcile its accounts receivable.