Mark Liwanag, DO
Clinical Cardiac Electrophysiology · Flagstaff, AZNPI 1932514858
Payments from drug & device makers
What this record shows
The money is spread across several categories — food and beverage (37.2%), travel and lodging and grants — rather than concentrated in one kind of arrangement. 23 manufacturers reported payments, led by Medtronic at 51.8% of the total. Reporting peaked in 2021 at $9,828 and has fallen 90.6% since, to $920 in 2025. That places this record below the midpoint for clinical cardiac electrophysiology clinicians in AZ, where the typical reported total is $29,180.
Across 173 payments — averaging $111.04 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Medtronic$10K
- Abbott$4K
- Boston Scientific$3K
- Cardiva Medical, Inc.$432
- ZOLL Services LLC (a/k/a ZOLL Lifecor Corp)$276
- Bracco Diagnostics Inc.$247
- plus $1K from 17 others
What the payments were for
- Grants$5,00026%
- Travel & lodging$6,62234%
- Food & beverage$7,15237%
- Education$4362%
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 |
|---|---|---|
| Medtronic(2 entities) | 29 | $9,952 |
| Abbott | 56 | $4,234 |
| Boston Scientific | 36 | $2,828 |
| Cardiva Medical, Inc. | 8 | $432 |
| ZOLL Services LLC (a/k/a ZOLL Lifecor Corp) | 10 | $276 |
| Bracco Diagnostics Inc. | 2 | $247 |
| Biosense Webster, Inc. | 3 | $228 |
| Novartis | 2 | $151 |
| Cardiovascular Systems Inc. | 1 | $140 |
| Philips North America LLC | 1 | $126 |
| United Therapeutics Corporation | 1 | $124 |
| Edwards Lifesciences | 2 | $108 |
| Pfizer | 4 | $67 |
| Johnson & Johnson | 3 | $49 |
| Amgen | 3 | $44 |
| AstraZeneca | 3 | $35 |
| E.r. Squibb & Sons, L.L.C. | 2 | $35 |
| Merck | 2 | $34 |
| Actelion Pharmaceuticals US, Inc. | 1 | $33 |
| Cordis US CORP. | 1 | $23 |
| Atricure, Inc. | 1 | $19 |
| Terumo Medical Corporation | 1 | $14 |
| Regeneron Healthcare Solutions, 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.
- Micra$2,635
- ENSITE PRECISION$1,468
- Arctic Front$1,223
- ENSITE$497
- Quadra Allure MP RF CRT Pacemkr$307
- TACTICATH ABLATION CATHETER, SENSOR ENABLED$251
- CEUS$247
- Ensite Cardiac Mapping System$240
- Cardiva VASCADE MVP VVCS 6-12F$221
- Carto 3$216
- VIEWMATE$146
- Coronary Orbital Atherectomy System$140
- CardioMEMS HF System$134
- (6557) Mechanical Tools$126
- WATCHMAN Access System$124
- REMODULIN$124
- TYVASO$124
- NONE$124
- ENTRESTO$122
- GENERAL - THERAPIES$112
How this compares
$19,210 in reported general payments places this provider in the 40th percentile of 80 clinical cardiac electrophysiology providers in Arizona.
See all clinical cardiac electrophysiology providers in Arizona →
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 |
|---|---|---|
| EliquisApixaban | 186 | $160,257 |
| XareltoRivaroxaban | 56 | $46,052 |
| Dofetilide | 14 | $2,883 |
| Flecainide Acetate | 69 | $2,500 |
| Metoprolol Succinate | 246 | $2,499 |
| Amiodarone Hcl | 58 | $685 |
| Pantoprazole Sodium | 44 | $401 |
| Sucralfate | 23 | $290 |
| Losartan Potassium | 26 | $186 |
| Amlodipine Besylate | 23 | $78 |
| Atorvastatin Calcium | 12 | $56 |
| Furosemide | 13 | $47 |
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 |
|---|---|---|
| PfizerEliquis | $67 | $160,257186 claims |
| Johnson & JohnsonXarelto | $49 | $46,05256 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 40th percentile of 80 clinical cardiac electrophysiology providers in Arizona.
Other clinical cardiac electrophysiology in Flagstaff
- Renzo CataldoFlagstaff$26K
- Asif SewaniFlagstaff$24K
- Akash MakkarPhoenix$318K
- Jonathan WeissPhoenix$290K
- Ashish SadhuScottsdale$264K
- Yoaav KrauthammerPhoenix$238K
- Vijendra SwarupPhoenix$187K
- Paul HaasPhoenix$136K
- Andy TranSurprise$125K
- Ambrose PanicoMesa$108K
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.