Final answer:
Dentures are not considered a basic service under a nonscheduled plan, as they are classified as major dental services due to their comprehensive nature and higher costs, unlike fillings, endodontics, and oral surgery which are typically covered.
Step-by-step explanation:
The correct option : d
The basic service that is NOT considered to be under a nonscheduled plan is dentures. Basic dental services commonly covered under most nonscheduled dental plans typically include procedures like fillings, endodontics, and oral surgery. These are routine and often necessary treatments for maintaining dental health, and they are meant to address common issues such as cavities, root canals, and extractions.
Dentures, on the other hand, while important for dental health, are generally classified under major dental services. Major dental services include treatments that are more comprehensive and costly, such as crowns, bridges, and dentures. Since they involve more complex procedures and higher costs, they are usually not included as basic services in nonscheduled dental plans.