Ramon Guadiz, MD
Nephrology · Lynwood, CANPI 1003998147
Payments from drug & device makers
What this record shows
This record is dominated by food and beverage: $659 of the $774 with a category attached, or 85.2%. 9 manufacturers reported payments, led by Amgen at 33.3% of the total. That places this record below the midpoint for nephrology clinicians in CA, where the typical reported total is $1,018.
Across 25 payments — averaging $30.97 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Amgen$258
- AstraZeneca$148
- Baxter Healthcare$131
- Otsuka America Pharmaceutical, Inc.$96
- OPKO Pharmaceuticals, LLC$46
- Fresenius USA Marketing, Inc.$42
- plus $54 from 3 others
Across 273 payments — averaging $3212.10 each. Payments tied to a research study. These frequently flow through the physician to a hospital or research institution rather than to the physician personally.
- GSK$295K
- Otsuka Pharmaceutical Development & Commercialization, Inc.$228K
- Akebia Therapeutics Inc$145K
- AstraZeneca$123K
- Ardelyx, Inc.$56K
- AbbVie$30K
What the payments were for
- Food & beverage$65985%
- Education$11515%
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 |
|---|---|---|
| Amgen(2 entities) | 7 | $258 |
| AstraZeneca | 7 | $148 |
| Baxter Healthcare | 1 | $131 |
| Otsuka America Pharmaceutical, Inc. | 1 | $96 |
| OPKO Pharmaceuticals, LLC | 4 | $46 |
| Fresenius USA Marketing, Inc. | 2 | $42 |
| GSK | 1 | $26 |
| Ardelyx, Inc. | 1 | $14 |
| Calliditas Therapeutics US Inc. | 1 | $14 |
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.
- KRYSTEXXA$131
How this compares
$774 in reported general payments places this provider in the 40th percentile of 1,341 nephrology 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 |
|---|---|---|
| FarxigaDapagliflozin Propanediol | 155 | $154,154 |
| JardianceEmpagliflozin | 78 | $85,783 |
| KerendiaFinerenone | 50 | $63,919 |
| VelphoroSucroferric Oxyhydroxide | 12 | $31,844 |
| ProsolParenteral Amino Acid 20% No.1 | 168 | $30,730 |
| LokelmaSodium Zirconium Cyclosilicate | 34 | $26,318 |
| DapagliflozinDapagliflozin Propanediol | 30 | $17,676 |
| ProcritEpoetin Alfa | 23 | $12,670 |
| Sevelamer Carbonate | 41 | $10,832 |
| JanuviaSitagliptin Phosphate | 12 | $10,058 |
| Calcium Acetate | 61 | $4,369 |
| Nifedipine ErNifedipine | 89 | $4,062 |
| ClinolipidFat Emulsion/Olive/Soy/Phospho | 12 | $3,734 |
| Tamsulosin Hcl | 154 | $2,655 |
| Losartan Potassium | 152 | $1,296 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| AstraZenecaFarxiga, Lokelma | $148 | $180,472189 claims |
| Fresenius USA Marketing, Inc.Velphoro | $42 | $31,84412 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 40th percentile of 1,341 nephrology providers in California.
Other nephrology in Lynwood
- Brian LeeLynwood$77K
- Anjay RastogiLos Angeles$2.2M
- Glenn ChertowStanford$2M
- Luis AlvarezPalo Alto$1.8M
- Jose MorfinSacramento$1M
- Rodolfo BatarseRancho Mirage$910K
- Vandana MathurWoodside$769K
- Yasir QaziOrange$618K
- Rafael VillicanaLoma Linda$610K
- Sunil PatelApple Valley$509K
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.