License & Identifications

A medical license is required for a doctor to practice medicine in a particular state. Requirements vary by state but most require, at a minimum, post-graduate training in the doctor’s specific specialty. An NPI number is a national identifier unique to an individual health care provider and is managed by the Center for Medicare & Medicaid Services (CMS).

Patient Reviews

Patient comments (3)

The overall average patient rating of Dr. John Diana is Good. Dr. Diana has been reviewed by 9 patients who have provided 3 comments. The rating is 3.5 out of 5 stars.

Patient Ratings
Ease of Appointment 4.4
Promptness 3.4
Courteous Staff 3.8
Accurate Diagnosis 4.3
Bedside Manner 3.7
Spends Time with Me 4.0
Follows Up After Visit 3.8

Specialties & Research

Dr. John Diana, MD is board certified in Orthopaedic Surgery.

  • He has special expertise in 5 areas:
  • Hip Osteoarthritis
  • Hip Surgery (Hip Replacement Arthroplasty)
  • Knee Osteoarthritis
  • Knee Surgery (Knee Replacement Arthroplasty)
  • Osteoarthritis (Hand and Wrist)

Education & Awards

Dr. Diana graduated from Indiana University , Indianapolis.


Dr. Diana has 6 hospital affiliations:

  • Queen of the Valley Hospital 
  • Sutter General Hospital 


  • English

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Additional Information
Dr. John Nicholas Diana MD is a male Orthopaedic Surgeon, has 15 years of experience and practices in Orthopaedic Surgery.
Where does Dr. John N. Diana practice?
Dr. John Diana has 5 office locations.
Dr. John Diana practices Orthopaedic Surgery near Saint Helena, CA.
Additional practice locations include: Vallejo, CA and Calistoga, CA.
See Saint Helena Orthopedic Surgeons.