A nurse in an acute care setting is preparing to administer medications to a client. Which of the following information should the nurse obtain to identify the client?

A. Room number of the client: Room numbers can change frequently and do not uniquely identify a client. Relying on room number alone increases the risk of medication errors and is not considered a safe identifier. B. Name of the client's provider: The provider’s name does not verify the client’s identity and cannot be used to ensure medications are given to the correct individual. It may be relevant for contacting regarding prescriptions but not for client identification. C. Client’s full medical diagnosis: The diagnosis provides clinical context but is not unique to the client and cannot confirm identity. Multiple clients may share the same diagnosis, so it is insufficient for safe medication administration. D. Client's telephone number: Using personal identifiers such as telephone number, along with at least one other identifier (e.g., full name, date of birth, or medical record number), helps accurately verify the client’s identity. This reduces the risk of medication errors and ensures safe administration.