John Nicholas Diana, M.D.
NPI 1649297540ActiveIndividual· Orthopaedic Surgery, Adult Reconstructive Orthopaedic Surgery· Napa, CA
Orthopaedic Surgery, Adult Reconstructive Orthopaedic Surgery (M.D.) in Napa, California, trained at Indiana University School of Medicine (class of 1996). 782 Medicare patients in 2024, $524,773 paid; all of their 296 Part D prescriptions were generic. Ortho Development Corporation was the largest of 7 companies reporting payments in 2025, $138,188 in all, mostly royalties and licenses.
Overview
| NPI | 1649297540 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 16, 2006 |
| Last updated in NPPES | Oct 22, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Adult Reconstructive Orthopaedic Surgery Primary | 207XS0114X | A87859 | CA |
| Orthopaedic Surgery, Sports Medicine | 207XX0005X | A87859 | CA |
| Orthopaedic Surgery, Orthopaedic Trauma | 207XX0801X | A87859 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Orthopedic Surgery (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 782 |
|---|---|
| Services billed | 2,776 across 38 procedure codes |
| Paid by Medicare | $524,773 |
Part D prescriptions in 2024
| Prescriptions (claims) | 296 · 304 30-day fills |
|---|---|
| Patients | 196 |
| Total drug cost | $956.24 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | Indiana University School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Orthopedic Surgery |
Medical groups
- St. Helena HospitalSaint Helena, CA · 84 clinicians
- Napa Valley Orthopaedic Medical Group IncNapa, CA · 17 clinicians
Hospital affiliations
- Adventist Health ClearlakeClearlake, CA
- Adventist Health St HelenaSaint Helena, CA
- Mad River Community HospitalArcata, CA
- Providence Queen of the Valley Medical CenterNapa, CA
- Sonoma Valley HospitalSonoma, CA
Industry payments (Open Payments)
- 2025$138,188 · 34 payments from 7 companies
- 2024$157,893 · 29 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ortho Development Corporation | $137,137 | 15 |
| Zimmer Biomet Holdings, Inc. | $584.42 | 8 |
| Avanos Medical | $134.19 | 1 |
| Heron Therapeutics, Inc. | $115.34 | 6 |
| Medacta USA, Inc. | $115.16 | 1 |
What the 2025 payments were for
- Royalty or License$136,959 · 13 payments
- Food and Beverage$1,051 · 19 payments
- Travel and Lodging$177.66 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records