Robert Nathan
Allergy & Immunology · Colorado Springs, CONPI 1487648077
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $80,580 of the $130,362 with a category attached, or 61.8%. GSK accounts for 95.3% of it on its own, with 5 other manufacturers making up the rest. Reporting peaked in 2019 at $107,500 and has fallen 89.7% since, to $11,070 in 2021. Among allergy & immunology clinicians in CO with any reported payments, this total sits in the top 10% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 151 payments — averaging $863.32 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GSK$124K
- Boehringer Ingelheim$6K
- AstraZeneca$138
- CSL Behring$22
- Regeneron Healthcare Solutions, Inc.$18
- Optinose US, Inc.$13
Across 18 payments — averaging $11,400 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.
- Novartis$116K
- GSK$88K
- Amgen$845
What the payments were for
- Consulting fees$27,52021%
- Speaking & faculty fees$80,58062%
- Travel & lodging$18,69914%
- Food & beverage$3,5633%
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 |
|---|---|---|
| GSK | 134 | $124,233 |
| Boehringer Ingelheim | 8 | $5,937 |
| AstraZeneca | 6 | $138 |
| CSL Behring | 1 | $22 |
| Regeneron Healthcare Solutions, Inc. | 1 | $18 |
| Optinose US, Inc. | 1 | $13 |
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.
- NUCALA$104,088
- ANORO ELLIPTA$8,450
How this compares
$130,362 in reported general payments places this provider in the 90th percentile of 89 allergy & immunology providers in Colorado.
Other allergy & immunology in Colorado Springs
- Christopher WebberColorado Springs$350K
- Eric CaplanColorado Springs$290K
- Jill HansonColorado Springs$15K
- Sterling KosmachColorado Springs$7K
- Deborah SweetColorado Springs$3K
- Rohit KatialDenver$758K
- Nicole BarberisLakewood$351K
- Jeffrey RumbyrtLakewood$348K
- Eileen WangDenver$274K
- Donald LeungDenver$208K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.