Final answer:
The best classification for unnoticed information entered into progress notes, which is not part of the SOAP notes, would be a 'supplemental record'. This additional information supports the primary entries in the medical documentation.
Step-by-step explanation:
The question pertains to how to categorize information in progress notes that is not part of the SOAP (Subjective, Objective, Assessment, Plan) format of patient documentation. Specifically, it asks how to classify additional information that is not directly related to the main content of the progress notes. In medical documentation, ancillary data refers to supplemental information that could include various types of additional healthcare data like lab results, radiology reports, or other diagnostic information. However, this does not match any of the options provided. Therefore, based on the choices given, the best answer would be d) Supplemental record. A supplemental record is additional information entered into the medical records that supports the primary entries without being part of the structured SOAP format.