Tonya Kaltenbach, MD
Gastroenterology · Palo Alto, CANPI 1578618419
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $181,286 of the $268,868 with a category attached, or 67.4%. Olympus Corporation accounts for 61.5% of it on its own, with 6 other manufacturers making up the rest. 2025 is the largest year on record at $121,172, 2.8 times the $43,633 reported in 2019. Among gastroenterology clinicians in CA with any reported payments, this total sits in the top 5% — high for the specialty, which is a reason to read the composition above rather than the number alone.
Across 234 payments — averaging $1149.01 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Olympus Corporation$165K
- Olympus Corporation Of The Americas$56K
- Boston Scientific$30K
- Olympus America Inc.$10K
- Medtronic$5K
- Olympus Medical Systems Corporation$3K
- plus $750 from 1 others
Across 3 payments — averaging $14,193 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.
- Gyrus ACMI, Inc.$38K
- Covidien LP$5K
What the payments were for
- Consulting fees$181,28667%
- Speaking & faculty fees$19,7667%
- Travel & lodging$49,38918%
- Food & beverage$3,6671%
- Education$14,7605%
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 |
|---|---|---|
| Olympus Corporation | 111 | $165,339 |
| Olympus Corporation Of The Americas | 78 | $56,112 |
| Boston Scientific | 34 | $29,805 |
| Olympus America Inc. | 2 | $9,531 |
| Medtronic | 1 | $4,500 |
| Olympus Medical Systems Corporation | 7 | $2,831 |
| Intuitive Surgical | 1 | $750 |
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.
- GENERAL - THERAPIES$26,475
- EVIS EXERA III COLONOVIDEOSCOPE$16,354
- EVIS EXERA$14,760
- Olympus Capital Accessories$14,760
- ScopeGuide$14,760
- Olympus GI Stricture Devices$14,760
- EVIS EXERA III DUODENOVIDEOSCOPE$10,442
- GASTROINTESTINAL VIDEOSCOPE$3,821
- EVIS EXERA II ULTRASOUND GASTROVIDEOSCOPE$2,259
- GENERAL ENDOCHOICE$1,470
- OverStitch Endoscopic Suturing System$1,402
- EVIS EUS ENDOSCOPIC ULTRASOUND CENTER$1,184
- Da Vinci Surgical System$750
- Single Use Repositionable Clip$615
- Computer Software$308
- EVIS EXERA lll COLONOVIDEOSCOPE$146
How this compares
$268,868 in reported general payments places this provider in the 95th percentile of 1,885 gastroenterology 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.
Other gastroenterology in Palo Alto
- David ShieldsPalo Alto$301K
- Ryan McConnellPalo Alto$197K
- Bennett RothLos Angeles$2.8M
- Douglas NguyenMission Viejo$2M
- Sammy SaabLos Angeles$1.9M
- Kenneth ChangNewport Beach$1.3M
- Joo HwangStanford$1M
- Drew SchembreWalnut Creek$659K
- Quan Nhula Jolla$641K
- Sadeea AbbasiLos Angeles$556K
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.