Charles Francis Preston, M.D.
NPI 1558529479ActiveIndividual· Orthopaedic Surgery, Sports Medicine· Walnut Creek, CA
Orthopaedic Surgery, Sports Medicine (M.D.) in Walnut Creek, California, trained at Irvine California College of Medicine (class of 2001). 326 Medicare patients in 2024, $103,819 paid; nearly all of their 90 Part D prescriptions were generic (99%). Zimmer Biomet Holdings, Inc. was the largest of 2 companies reporting payments in 2025, $234.84 in all, mostly food and beverage.
Overview
| NPI | 1558529479 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 28, 2008 |
| Last updated in NPPES | Nov 12, 2025 |
| Certified by provider | Nov 12, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Sports Medicine Primary | 207XX0005X | A99089 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 326 |
|---|---|
| Services billed | 4,126 across 44 procedure codes |
| Paid by Medicare | $103,819 |
Part D prescriptions in 2024
| Prescriptions (claims) | 90 · 104 30-day fills |
|---|---|
| Patients | 40 |
| Total drug cost | $1,480 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Irvine California College of Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Orthopedic Surgery |
| Secondary specialties | Sports Medicine |
Medical group
- Golden State Orthopedics and SpineCampbell, CA · 182 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$234.84 · 3 payments from 2 companies
- 2024$4,668 · 7 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Zimmer Biomet Holdings, Inc. | $197.66 | 1 |
| Bioventus LLC | $37.18 | 2 |
What the 2025 payments were for
- Food and Beverage$234.84 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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