Karen Michelle Guiang, DO
Infectious Disease · Claremont, CANPI 1871738344
Payments from drug & device makers
Across 356 payments — averaging $19.24 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Gilead$2K
- AbbVie$1K
- Merck$1K
- Cumberland Pharmaceuticals, Inc.$627
- Viiv Healthcare Company$604
- Insmed, Inc.$381
- plus $929 from 12 others
What the payments were for
- Food & beverage$6,73298%
- Education$1192%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Gilead | 98 | $1,684 |
| AbbVie(2 entities) | 91 | $1,456 |
| Merck | 64 | $1,171 |
| Cumberland Pharmaceuticals, Inc. | 16 | $627 |
| Viiv Healthcare Company | 30 | $604 |
| Insmed, Inc. | 19 | $381 |
| Shionogi Inc | 9 | $251 |
| La Jolla Pharmaceutical Company | 8 | $173 |
| Baxter Healthcare | 5 | $112 |
| Paratek Pharmaceuticals, Inc. | 6 | $106 |
| GSK | 1 | $78 |
| Astellas Pharma US Inc | 2 | $42 |
| Melinta Therapeutics, LLC | 2 | $41 |
| Aimmune Therapeutics, Inc. | 1 | $32 |
| EMD Serono, Inc. | 1 | $29 |
| Nabriva Therapeutics, PLC | 1 | $23 |
| Theratechnologies Inc. | 1 | $21 |
| Tetraphase Pharmaceuticals, Inc. | 1 | $21 |
What the payments were tied to
Products named in the reported payments. Only payments of $100 or more are attributed here — the typical reported payment nationally is a meal worth about $16, and listing those product-by-product would be noise.
How this compares
$6,851 in reported general payments places this provider in the 75th percentile of 856 infectious disease providers in California.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Daptomycin | 52 | $42,639 |
| ErtapenemErtapenem Sodium | 44 | $28,929 |
| Vancomycin Hcl | 78 | $17,596 |
| Penicillin G Sodium | 11 | $10,618 |
| Cefepime Hcl | 44 | $10,322 |
| MicafunginMicafungin Sodium | 19 | $6,578 |
| CeftriaxoneCeftriaxone Sodium | 62 | $6,190 |
| Meropenem | 22 | $5,641 |
| Ampicillin Sodium | 14 | $5,331 |
| Piperacillin-TazobactamPiperacillin Sodium/Tazobactam | 20 | $5,057 |
| Ampicillin-SulbactamAmpicillin Sod/Sulbactam Sod | 26 | $4,224 |
| Ethambutol Hcl | 11 | $799 |
| Rifampin | 12 | $792 |
| Linezolid | 16 | $734 |
| Azithromycin | 20 | $680 |
Paid to pharmacies, not to this prescriber.
Other infectious disease in Claremont
- Peter RuaneLos Angeles$24.6M
- Raphael LandovitzLos Angeles$21.4M
- Philip RobinsonNewport Beach$4.9M
- Shawn HasslerSan Francisco$4.3M
- James McKinnellTorrance$4.3M
- Loren MillerTorrance$4.1M
- Jay GladsteinLos Angeles$4M
- Claire PomeroySacramento$3.8M
- Franco FelizartaBakersfield$3.5M
- Abhijit LimayeSan Francisco$2.9M
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.