Mazen Arar, MD
Pediatric Nephrology · San Antonio, TXNPI 1962519033
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $991 of the $1,517 with a category attached, or 65.3%. Bayer accounts for 91.2% of it on its own, with 5 other manufacturers making up the rest. Reporting peaked in 2024 at $1,383 and has fallen 94.8% since, to $71 in 2025.
Across 19 payments — averaging $79.84 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Bayer$1K
- Kyowa Kirin, Inc.$55
- Ultragenyx Pharmaceutical Inc.$23
- Silvergate Pharmaceuticals, Inc.$20
- AstraZeneca$19
- Fresenius USA Marketing, Inc.$16
Across 10 payments — averaging $4947.50 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.
- Bayer$40K
- Rockwell Medical, Inc.$10K
What the payments were for
- Travel & lodging$99165%
- Food & beverage$52635%
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 |
|---|---|---|
| Bayer | 13 | $1,383 |
| Kyowa Kirin, Inc. | 2 | $55 |
| Ultragenyx Pharmaceutical Inc. | 1 | $23 |
| Silvergate Pharmaceuticals, Inc. | 1 | $20 |
| AstraZeneca | 1 | $19 |
| Fresenius USA Marketing, Inc. | 1 | $16 |
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.
- Kerendia$1,002
How this compares
$1,517 in reported general payments places this provider in the 75th percentile of 61 pediatric nephrology providers in Texas.
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 |
|---|---|---|
| Labetalol Hcl | 13 | $264 |
| Pantoprazole Sodium | 11 | $68 |
| Amlodipine Besylate | 20 | $27 |
Paid to pharmacies, not to this prescriber.
Other pediatric nephrology in San Antonio
- Melissa CadnapaphornchaiSan Antonio$10K
- Issa AlhamoudSan Antonio$3K
- Asmaa Abu MaziadSan Antonio$2K
- Khurrum SiddiqueSan Antonio$1K
- Daniel RanchSan Antonio$712
- Kim PiburnSan Antonio$469
- Rajasree SreedharanSan Antonio$64
- Erica HughleySan Antonio$18
- Amy BeckerCorpus Christi$77K
- Mini MichaelHouston$25K
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.