Chi Mong Christopher Or, MD
NPI 1639676000ActiveIndividual· Ophthalmology· Stanford, CA
Ophthalmology (MD) with Stanford Health Care and 1 other group, practicing in Stanford, California. In 2024 Medicare paid $230,762 for 817 patients, and Part D covered 904 of their prescriptions, 52% of them generic. Mallinckrodt Hospital Products Inc. was the largest of 8 companies reporting payments in 2025, $4,145 in all, mostly food and beverage. Lists Stanford Health Care as a hospital affiliation.
Overview
| NPI | 1639676000 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 11, 2018 |
| Last updated in NPPES | Nov 21, 2025 |
| Certified by provider | Nov 21, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | A172845 | CA |
| Ophthalmology, Uveitis and Ocular Inflammatory Disease | 207WX0108X | A172845 | 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 - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 817 |
|---|---|
| Services billed | 2,155 across 37 procedure codes |
| Paid by Medicare | $230,762 |
Part D prescriptions in 2024
| Prescriptions (claims) | 904 · 1,718 30-day fills |
|---|---|
| Patients | 264 |
| Total drug cost | $137,795 |
| Generic share | 52% of claims |
Education and affiliations
| Graduation year | 2015 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical groups
- Stanford Health CareStanford, CA · 3,122 clinicians
- University Healthcare AlliancePleasanton, CA · 327 clinicians
Hospital affiliation
- Stanford Health CareStanford, CA
Industry payments (Open Payments)
- 2025$4,145 · 47 payments from 8 companies
- 2024$2,724 · 33 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mallinckrodt Hospital Products Inc. | $1,980 | 12 |
| Harrow Eye, LLC | $738.64 | 2 |
| Ani Pharmaceuticals, Inc. | $506.82 | 17 |
| Apellis Pharmaceuticals, Inc. | $457.88 | 9 |
| Ocular Therapeutix, Inc. | $227.88 | 3 |
What the 2025 payments were for
- Food and Beverage$1,895 · 45 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,550 · 1 payment
- Consulting Fee$700.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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