Chee Hian Tan, M.D., PH.D.
NPI 1346263357ActiveIndividual· Ophthalmology· Pasadena, CA
Ophthalmology (M.D., PH.D.) with Richard H. Yook, M.D, Inc., practicing in Pasadena, California. In 2024 Medicare paid $278,558 for 721 patients, and Part D covered 1,568 of their prescriptions, 64% of them generic. Glaukos Corporation was the largest of 2 companies reporting payments in 2025, $355.13 in all, mostly food and beverage.
Overview
| NPI | 1346263357 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., PH.D. |
| Sole proprietor | No |
| NPI issued | Jul 25, 2006 |
| Last updated in NPPES | Jan 16, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | A111014 | 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 - Ophthalmology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 721 |
|---|---|
| Services billed | 2,986 across 32 procedure codes |
| Paid by Medicare | $278,558 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,568 · 2,909 30-day fills |
|---|---|
| Patients | 303 |
| Total drug cost | $79,222 |
| Generic share | 64% of claims |
Education and affiliations
| Graduation year | 1993 |
|---|---|
| Medicare specialty | Ophthalmology |
Medical group
- Richard H. Yook, M.D, Inc.Northridge, CA · 2 clinicians
Industry payments (Open Payments)
- 2025$355.13 · 3 payments from 2 companies
- 2024$22.06 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaukos Corporation | $206.76 | 1 |
| Alcon Vision LLC | $148.37 | 2 |
What the 2025 payments were for
- Food and Beverage$355.13 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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