Which type of providers must grant VHP access to charts at any time upon request?

The correct choice, which identifies that contracted providers must grant VHP access to charts at any time upon request, is aligned with the contractual agreements made between healthcare organizations and their providers. Contracted providers are those who have signed an agreement with a health plan, such as VHP, to deliver services to members under specific terms, including compliance with requests for quality assurance and oversight activities.

This access to patient charts is crucial for ensuring that the contracted provider meets the necessary standards and adheres to the healthcare regulations set forth by organizations like VHP. It allows for the evaluation of care quality, adherence to care protocols, and overall performance monitoring.

The other provider types typically have different arrangements regarding access to patient charts. Non-contracted providers may not have any formal obligation to comply with such requests unless they have some other legal or regulatory requirement. Voluntary providers, depending on their status, might not have the same access demands as contracted providers do. Therefore, the obligation for chart access is primarily a function of the established contract which stipulates the need for transparency and accountability in patient care for contracted providers.