Summary

Dr. John Diana specializes in orthopedic surgery with three decades of experience helping patients with bone, joint, and muscle conditions. He earned his medical degree from Indiana University School of Medicine and completed his residency at the prestigious Hospital of the University of Pennsylvania. His extensive training and 30 years of practice have given him deep expertise in treating complex musculoskeletal problems. Dr. Diana is fluent in both English and Spanish, allowing him to serve patients from diverse backgrounds in his community.

Dr. Diana practices at Queen of the Valley Medical Center and maintains locations throughout Napa, California. He frequently treats patients with osteoarthritis affecting the knee and hip joints, helping them regain mobility and reduce pain. His surgical expertise includes knee surgery and other orthopedic procedures, while he also incorporates physical therapy into comprehensive treatment plans. Patients have given Dr. Diana an average rating of 4.1 stars, reflecting their confidence in his skilled care and dedication to improving their quality of life.
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Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 4
  • 30 years of experience
  • speaks English, Spanish
  • Hospital Of The University Of Pennsylvania
  • 7 written reviews
  • 1 specialty
  • 5 areas of expertise
  • 1 board certification
  • 1 hospital affiliation
  • 3 office locations
  • Male

Patients’ Perspective

  • Gave an accurate diagnosis
  • Had a good bedside manner
  • Spent time with me

Office Locations

Dr. John Nicholas Diana has 3 locations

Napa Valley Orthopaedic Medical Group Inc

3273 Claremont Way Ste 100Napa, CA 94558
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed

Valley Surgical Suites

3365 Solano AveNapa, CA 94558
Mon6:00 am - 6:00 pm
Tue6:00 am - 6:00 pm
Wed6:00 am - 6:00 pm
Thu6:00 am - 6:00 pm
Fri6:00 am - 6:00 pm
SatClosed
SunClosed

Compare with Similar Doctors

Dr. John Nicholas Diana JR., MD
Robert Peterson, MD
Jason Marengo, MD
Neil Pathare, MD
Dr. John Nicholas Diana JR., MDRobert Peterson, MDJason Marengo, MDNeil Pathare, MD
Orthopedic SurgeryOrthopedic SurgeryOrthopedic SurgeryOrthopedic Surgery
Accepts New Patients Accepts New Patients Accepts New Patients Accepts New Patients
3.1 
4.6 
30 Years of Experience 34 Years of Experience 25 Years of Experience 20 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English, Spanish Speaks English Speaks Russian, Spanish Speaks Chinese, English, Spanish
Napa , CAVacaville , CAVacaville , CAFairfield , CA
Med School: Indiana University School Of Medicine Med School: Albert Einstein College Of Medicine Of Yeshiva University Med School: Keck School Of Medicine Of The University Of Southern California Med School: Tufts University School Of Medicine
Current Profile
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Insurance Plans Accepted by Dr. John Nicholas Diana

  • Accepts Medicare

Medical Specialties

Dr. John Nicholas Diana has the following specialty

Specialty Expertise

Dr. John Nicholas Diana has the following 5 areas of expertise

  • Hip Osteoarthritis
  • Hip Surgery (Hip Replacement Arthroplasty)
  • Knee Osteoarthritis
  • Knee Surgery (Knee Replacement Arthroplasty)
  • Osteoarthritis (Hand and Wrist)

Certifications, License, & Education

30 Years Experience

Dr. John Nicholas Diana holds an expired medical license in the state of California.

Medical License

Medical Doctor with an expired medical license in the state of California that expired in 2026.

Education & Training

Residency

Completed their residency at Hospital Of The University Of Pennsylvania.

Medical School

Graduated from Indiana University School Of Medicine in 1996.

NPI Number

Dr. Diana's NPI number is 1649297540.

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Frequently Asked Questions

How can I make an appointment with Dr. John Diana?
You can find contact information for Dr. John Diana here on Vitals.
Is Dr. John Diana accepting new patients?
Dr. John Diana is accepting new patients on Vitals. View Dr. John Diana's profile on Vitals to make an appointment.
Does Dr. John Diana accept my insurance?
You can see the insurance plans that Dr. John Diana accepts on their Vitals profile.
Where is Dr. John Diana's office located?
Dr. John Diana's office is located at 3273 Claremont Way Ste 100, Napa, CA, 94558.
Which hospitals is Dr. John Diana affiliated with?
Dr. John Diana is affiliated with Queen Of The Valley Medical Center.

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