​Although the medical group goes back over many years, our PPMG foundation was started by Dr. John Shaw in 2012. Dr. Shaw is remembered as a very kind and caring person who loved his patients. He was dedicated and accessible, and never turned anyone away. His commitment to the community was evident in his success of this practice and the continued expressions of praise by his patients, past and present.​
​HOME OF THE MIGHTY DOCS
​As leaders of Platinum Providers Medical, we declare to be the gold standard medical group of the Inland Empire. We can be counted on to deliver quality care through innovation and integrity while upholding our core values. We stand united as one team, committed to providing outstanding service to our community.

OUR PROVIDERS

​​Peter Mattar, M.D., MPH
Dr. Peter N. Mattar is a Family Practice specialist in Riverside, California. He attended and graduated from Loma Linda University School of Medicine in 2005, having over 17 years of diverse experience, especially in Family Practice.
Renanda Stevenson, DNP
​Dr. Renanda Stevenson is a Doctorate level Nurse Practitioner and has been practicing for over 20 years throughout the Inland Empire, specializing in Family Practice, Women’s Health and Urgent Care.

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John Agtuca, D.O.
​Dr. John Agtuca is a long time Southern California resident. He grew up in Anaheim and attended college at the University of California Riverside.

CONDITIONS WE TREAT