Physician Profile
John N. Diana, M.D.
Unclaimed ProfileAbout Dr. Diana
John N. Diana, M.D. practices orthopaedic adult reconstructive surgery in Napa, CA. John is a 1996 graduate of Indiana University School of Medicine. John is also listed as specializing in orthopaedic sports medicine and orthopaedic trauma. According to Medicare claims data, John cared for 2,108 Medicare patients across 2,703 services. The services billed most often include injection, triamcinolone acetonide, not otherwise specified, 10 mg, x-ray of knee, 4 or more views, and replacement of knee joint, both sides of knee.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (707) 254-7117
- Email not available
Practice Locations
3273 CLAREMONT WAY SUITE 100
Napa, CA 94558
Procedures Most Often Billed to Medicare
2,703 services · 2,108 patients · 24 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Replacement of knee joint, both sides of knee | Procedure | 27447 |
207 | More than most peers in Orthopaedic Adult Reconstructive… |
| Replacement of thigh bone and hip joint with prosthesis | Procedure | 27130 |
122 | More than most peers in Orthopaedic Adult Reconstructive… |
| Computer-assisted surgery for muscle and bone procedure | Procedure | 20985 |
120 | More often than most peers in Orthopaedic Adult Reconstructive… |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
94 | More often than most peers in Orthopaedic Adult Reconstructive… |
| Aspiration and/or injection of fluid from large joint | Procedure | 20610 |
69 | More often than most peers in Orthopaedic Adult Reconstructive… |
| Manipulation of knee joint under anesthesia | Procedure | 27570 |
12 | Too few peers to compare |
| X-ray of knee, 4 or more views | Imaging | 73564 |
289 | More often than most peers in Orthopaedic Adult Reconstructive… |
| X-ray of knee, 3 views | Imaging | 73562 |
204 | More often than most peers in Orthopaedic Adult Reconstructive… |
| X-ray of hip, 2-3 views | Imaging | 73502 |
146 | More often than most peers in Orthopaedic Adult Reconstructive… |
| X-ray of hip, 2-3 views | Imaging | 73502 |
145 | More often than most peers in Orthopaedic Adult Reconstructive… |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Trained at Indiana University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1996 at Indiana University School of Medicine 8
Providers who graduated from the same medical school in the same year.
More connections — 8 related providers in 1 group
Also performs Replacement of knee joint, both sides of knee 8
Providers in CA who bill this service to Medicare most often.
Common questions
What kind of doctor is John N. Diana?
John N. Diana is an orthopaedic adult reconstructive surgeon in Napa, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Orthopaedic Adult Reconstructive Surgery”.
NPI registry
What is John N. Diana's address?
John N. Diana is listed at 3273 Claremont Way Suite 100, Napa, CA 94558. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with John N. Diana?
The number on file is (707) 254-7117. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is John N. Diana's NPI number?
John N. Diana's National Provider Identifier is 1649297540. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did John N. Diana train?
John N. Diana attended Indiana University School of Medicine, graduating in 1996. This comes from the CMS National Downloadable File.
CMS public data
How long has John N. Diana been practicing?
John N. Diana has 30 years experience. Calculated from a graduation year of 1996, reported in the CMS National Downloadable File.
CMS public data
What procedures does John N. Diana perform?
According to Medicare billing data, John N. Diana performs procedures including replacement of knee joint, both sides of knee, replacement of thigh bone and hip joint with prosthesis and computer-assisted surgery for muscle and bone procedure; reads or performs imaging such as x-ray of knee, 4 or more views and x-ray of knee, 3 views, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has John N. Diana confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by John N. Diana. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.