Karen Michelle Uy-Uyan Guiang, D.O.
NPI 1871738344ActiveIndividual· Internal Medicine, Infectious Disease· Claremont, CA
Internal Medicine, Infectious Disease (D.O.) in Claremont, California, trained at College of Osteo Med of the Pacific at Pomona (class of 2007). 736 Medicare patients in 2024, $491,711 paid; nearly all of their 677 Part D prescriptions were generic (94%). Gilead Sciences, Inc. was the largest of 8 companies reporting payments in 2025, $869.77 in all, mostly food and beverage.
Overview
| NPI | 1871738344 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Dec 11, 2008 |
| Last updated in NPPES | Apr 29, 2020 |
| Certified by provider | Apr 29, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | 20A10579 | CA |
| Internal Medicine | 207R00000X | 20A10579 | 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 - Infectious Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 736 |
|---|---|
| Services billed | 76,534 across 16 procedure codes |
| Paid by Medicare | $491,711 |
Part D prescriptions in 2024
| Prescriptions (claims) | 677 · 736 30-day fills |
|---|---|
| Patients | 207 |
| Total drug cost | $203,931 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | College of Osteo Med of the Pacific at Pomona |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Infectious Disease |
| Telehealth | Offers telehealth |
Medical group
- Streng Bassi Begum and Jiang Medical CorporationClaremont, CA · 7 clinicians
Hospital affiliations
- Emanate Health Foothill Presbyterian HospitalGlendora, CA
- San Antonio Regional HospitalUpland, CA
Industry payments (Open Payments)
- 2025$869.77 · 40 payments from 8 companies
- 2024$1,052 · 54 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $310.75 | 15 |
| Baxter Healthcare | $112.19 | 5 |
| Merck Sharp & Dohme LLC | $108.59 | 5 |
| Abbvie Inc. | $99.89 | 5 |
| Shionogi Inc | $83.84 | 3 |
What the 2025 payments were for
- Food and Beverage$844.07 · 39 payments
- Education$25.70 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Infectious Disease providers in Claremont
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