Debbie Choi Man Chan, MPA
NPI 1891084117ActiveIndividual· Physician Assistant· Walnut Creek, CA
Physician Assistant (MPA) with John Muir Physician Network, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $902,835 for 2,936 claims, against $69,146 paid for services in 2024. Aop Health US, LLC was the largest of 24 companies reporting payments in 2025, $2,708 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus as a hospital affiliation.
Overview
| NPI | 1891084117 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MPA |
| Sole proprietor | Yes |
| NPI issued | Apr 7, 2011 |
| Last updated in NPPES | Apr 24, 2023 |
| Certified by provider | Apr 24, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA21538 | 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 - Physician Assistant (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 515 |
|---|---|
| Services billed | 722 across 16 procedure codes |
| Paid by Medicare | $69,146 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,936 · 7,831 30-day fills |
|---|---|
| Patients | 1,241 |
| Total drug cost | $902,835 |
| Generic share | 78% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Physician Assistant |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliation
- John Muir Medical Center - Concord CampusConcord, CA
Industry payments (Open Payments)
- 2025$2,708 · 86 payments from 24 companies
- 2024$2,274 · 99 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aop Health US, LLC | $812.06 | 1 |
| Heartflow, Inc. | $236.54 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $222.23 | 12 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $185.83 | 4 |
| Novartis Pharmaceuticals Corporation | $161.47 | 10 |
What the 2025 payments were for
- Food and Beverage$2,708 · 86 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Physician Assistant providers in Walnut Creek
- 1639979552
- 1114416773
- 1841537115
- 1801575543
- 1790023620
- 1689075236
- 1639194616
- 1134235773
- 1891463667
- 1902936115
- 1487927414
- 1730559642