Irene Sonu, MD
Gastroenterology · Palo Alto, CANPI 1801100300
Payments from drug & device makers
What this record shows
This record is dominated by travel and lodging: $4,825 of the $5,705 with a category attached, or 84.6%. Anx Robotica Corp accounts for 89.2% of it on its own, with 6 other manufacturers making up the rest. 2025 is the largest year on record at $5,157, more than ten times the $209 reported in 2023.
Across 13 payments — averaging $438.84 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Anx Robotica Corp$5K
- Aimmune Therapeutics, Inc.$154
- Celltrion, Inc.$150
- Boston Scientific$146
- Ardelyx, Inc.$81
- Salix Pharmaceuticals, A Division Of Bausch Health US, LLC$68
- plus $20 from 1 others
What the payments were for
- Travel & lodging$4,82585%
- Food & beverage$88015%
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 |
|---|---|---|
| Anx Robotica Corp | 3 | $5,087 |
| Aimmune Therapeutics, Inc. | 3 | $154 |
| Celltrion, Inc. | 1 | $150 |
| Boston Scientific | 2 | $146 |
| Ardelyx, Inc. | 2 | $81 |
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLC | 1 | $68 |
| Ferring Pharmaceuticals Inc. | 1 | $20 |
How this compares
$5,705 in reported general payments places this provider in the 70th 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.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| MotegrityPrucalopride Succinate | 260 | $167,140 |
| LinzessLinaclotide | 145 | $95,749 |
| XifaxanRifaximin | 26 | $58,486 |
| CreonLipase/Protease/Amylase | 19 | $37,427 |
| IbsrelaTenapanor Hcl | 16 | $27,645 |
| Dexlansoprazole DrDexlansoprazole | 35 | $10,002 |
| Octreotide Acetate | 11 | $5,541 |
| Cromolyn Sodium | 13 | $4,828 |
| Colesevelam Hcl | 17 | $4,140 |
| Pyridostigmine Bromide | 55 | $3,283 |
| Esomeprazole Magnesium | 56 | $2,806 |
| Omeprazole | 206 | $2,485 |
| Lubiprostone | 18 | $1,669 |
| Diphenoxylate-AtropineDiphenoxylate Hcl/Atropine | 29 | $1,426 |
| Promethazine Hcl | 61 | $1,278 |
Paid to pharmacies, not to this prescriber.
Companies that both paid and supply prescribed drugs
These companies both reported payments to this provider and make drugs the provider prescribed under Medicare Part D in 2024. For most specialties this overlap is expected — a cardiologist who is paid by a cardiology drugmaker also treats heart disease. It is shown so the reader can see it, not because it implies anything on its own.
| Company | Paid to this provider | Part D cost of their drugs |
|---|---|---|
| Salix Pharmaceuticals, A Division Of Bausch Health US, LLCXifaxan | $68 | $58,48626 claims |
| Ardelyx, Inc.Ibsrela | $81 | $27,64516 claims |
Reading this fairly. The Part D column is what drug plans and patients paid pharmacies — this provider received none of it, and it reflects how many patients they treat and what those drugs cost. Against peers, this provider's reported payments sit in the 70th percentile of 1,885 gastroenterology providers in California.
Other gastroenterology in Palo Alto
- David ShieldsPalo Alto$301K
- Tonya KaltenbachPalo Alto$269K
- 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
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.