Mark Chittum
Retina Specialist · Colorado Springs, CONPI 1518942572
Payments from drug & device makers
What this record shows
This record is dominated by speaking fees: $3,048 of the $4,067 with a category attached, or 75.0%. F. Hoffmann-la Roche AG accounts for 75.0% of it on its own, with 6 other manufacturers making up the rest. Reporting peaked in 2019 at $3,553 and has fallen 90.8% since, to $328 in 2021. That places this record below the midpoint for retina specialist clinicians in CO, where the typical reported total is $4,083.
Across 11 payments — averaging $369.69 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- F. Hoffmann-la Roche AG$3K
- US Retina LLC$909
- Regeneron Healthcare Solutions, Inc.$35
- AbbVie$26
- Genentech USA, Inc.$20
- Genentech, Inc.$17
- plus $12 from 1 others
Across 37 payments — averaging $32,039 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.
- Genentech, Inc.$1.2M
- Eyepoint US, Inc.$7K
- F. Hoffmann-la Roche AG$2K
What the payments were for
- Speaking & faculty fees$3,04875%
- Food & beverage$1103%
- Ownership interest$90922%
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 |
|---|---|---|
| F. Hoffmann-la Roche AG | 1 | $3,048 |
| US Retina LLC | 3 | $909 |
| Regeneron Healthcare Solutions, Inc. | 1 | $35 |
| AbbVie | 2 | $26 |
| Genentech USA, Inc. | 2 | $20 |
| Genentech, Inc. | 1 | $17 |
| Eyepoint US, Inc. | 1 | $12 |
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.
- Non-Covered Product$3,048
How this compares
$4,067 in reported general payments places this provider in the 45th percentile of 51 retina specialist providers in Colorado.
Other retina specialist in Colorado Springs
- Adam MartidisColorado Springs$15K
- James LuuColorado Springs$11K
- Cecinio RonquilloColorado Springs$10K
- Ramin SarrafizadehColorado Springs$6K
- Stanford TaylorColorado Springs$5K
- Amar ManninaColorado Springs$2K
- Jonathan WilliamsColorado Springs$367
- Murtaza AdamParker$548K
- Alan KimuraDenver$546K
- Brian JoondephDenver$92K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Identity: NPPES NPI Registry, July 2026.