Which library is primarily used in the accounts receivable functions of a practice management system?

The option identifying insurance company names is correct because the accounts receivable functions within a practice management system are closely tied to billing and revenue cycle management. These functions require accurate information about the various insurance providers that a healthcare facility interacts with, as proper billing relies heavily on the right insurance company details being accessible.

When handling accounts receivable, it's essential to not only submit claims to the correct insurance companies but also manage follow-ups on pending claims, track payments, and resolve any discrepancies that might arise. Having access to the names of insurance companies, along with their specific billing requirements and payment processes, directly supports these functions.

The other options, while important in their respective contexts, do not directly impact the accounts receivable functions. Patient medical records pertain to clinical data, pharmacy information is related to prescriptions and medication management, and a diagnostic code repository is crucial for coding diagnoses and procedures but does not specifically address the financial interactions associated with accounts receivable. Therefore, the focus on insurance company names is critical for efficient financial operations in a practice management system.