John Mahan
Pediatric Nephrology · Columbus, OHNPI 1023002417
Payments from drug & device makers
What this record shows
The money is spread across several categories — consulting fees (59.7%), speaking fees and travel and lodging — rather than concentrated in one kind of arrangement. 13 manufacturers reported payments, led by Ultragenyx Pharmaceutical Inc. at 38.1% of the total. Reporting peaked in 2021 at $25,324 and has fallen 65.4% since, to $8,772 in 2025.
Across 76 payments — averaging $1170.73 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Ultragenyx Pharmaceutical Inc.$34K
- Kyowa Kirin, Inc.$23K
- Azurity Pharmaceuticals, Inc.$17K
- Apellis Pharmaceuticals, Inc.$4K
- Vifor Pharma, Inc.$4K
- Otsuka Pharmaceutical Development & Commercialization, Inc.$3K
- plus $5K from 7 others
Across 131 payments — averaging $3942.93 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.
- Ultragenyx Pharmaceutical Inc.$487K
- Amgen$24K
- OPKO Pharmaceuticals, LLC$5K
What the payments were for
- Consulting fees$53,11960%
- Speaking & faculty fees$31,53735%
- Travel & lodging$2,5653%
- Food & beverage$1,7552%
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 |
|---|---|---|
| Ultragenyx Pharmaceutical Inc. | 31 | $33,907 |
| Kyowa Kirin, Inc. | 24 | $22,646 |
| Azurity Pharmaceuticals, Inc. | 1 | $17,250 |
| Apellis Pharmaceuticals, Inc. | 5 | $4,122 |
| Vifor Pharma, Inc. | 3 | $3,725 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. | 1 | $2,640 |
| Boehringer Ingelheim | 3 | $1,990 |
| AstraZeneca | 2 | $1,723 |
| Fresenius USA Marketing, Inc. | 2 | $749 |
| Biomarin Pharmaceutical Inc. | 1 | $106 |
| Vertex | 1 | $56 |
| Mallinckrodt Enterprises LLC | 1 | $33 |
| Novartis | 1 | $29 |
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
$88,976 in reported general payments places this provider in the 85th percentile of 44 pediatric nephrology providers in Ohio.
Other pediatric nephrology in Columbus
- William SmoyerColumbus$161K
- Gabriel Cara FuentesColumbus$28K
- Hiren PatelColumbus$326
- Beth VogtColumbus$262
- Tahagod MohamedColumbus$199
- Kirsten KusumiColumbus$155
- Orville BignallColumbus$150
- Mahmoud KallashColumbus$115
- Diana Zepeda-OrozcoColumbus$104
- Nina MannColumbus$48
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.