Marlyn Mayo, MD
Hepatology · Dallas, TXNPI 1003872292
Payments from drug & device makers
What this record shows
This record is dominated by consulting fees: $53,169 of the $67,419 with a category attached, or 78.9%. 13 manufacturers reported payments, led by GSK at 27.0% of the total. Reporting peaked in 2022 at $18,638 and has fallen 52.6% since, to $8,829 in 2025.
Across 42 payments — averaging $1605.22 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- GSK$18K
- Mallinckrodt Hospital Products Inc.$13K
- Ironwood Pharmaceuticals, Inc$11K
- Mirum Pharmaceuticals, Inc.$6K
- Intercept Pharmaceuticals, Inc.$6K
- Ipsen Innovation$4K
- plus $9K from 7 others
Across 356 payments — averaging $2524.26 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.
- Intercept Pharmaceuticals, Inc.$206K
- Gilead$160K
- GSK$155K
- Mallinckrodt Enterprises LLC$111K
- Ipsen Bioscience Inc.$85K
- Ipsen Pharma SAS$61K
- plus $119K from 4 others
What the payments were for
- Consulting fees$53,16979%
- Speaking & faculty fees$12,12018%
- Travel & lodging$8941%
- Food & beverage$1,2362%
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 | 5 | $18,200 |
| Mallinckrodt Hospital Products Inc. | 5 | $13,430 |
| Ironwood Pharmaceuticals, Inc | 5 | $11,050 |
| Mirum Pharmaceuticals, Inc. | 9 | $6,398 |
| Intercept Pharmaceuticals, Inc. | 6 | $5,659 |
| Ipsen Innovation | 1 | $3,735 |
| Ipsen Biopharmaceuticals, Inc | 3 | $3,046 |
| Intra-sana Laboratories | 2 | $3,000 |
| Ipsen Pharma SAS | 1 | $2,094 |
| Regeneron | 1 | $375 |
| Gilead | 2 | $227 |
| Perspectum Diagnostics Ltd | 1 | $133 |
| Mallinckrodt Enterprises LLC | 1 | $73 |
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.
- Livmarli$6,180
- OCALIVA$5,600
- Reltone 200 Mg$3,000
- GLYCATE$3,000
- Reltone 400 Mg$3,000
- TERLIVAZ$147
- MRCP+$133
How this compares
$67,419 in reported general payments places this provider in the 70th percentile of 22 hepatology providers in Texas.
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 |
|---|---|---|
| OcalivaObeticholic Acid | 54 | $523,421 |
| Ursodiol | 221 | $38,123 |
| CreonLipase/Protease/Amylase | 11 | $8,421 |
| Azathioprine | 24 | $1,570 |
| Sod Sulf-Potass Sulf-Mag SulfSodium, Potassium,mag Sulfates | 22 | $1,544 |
| Gavilyte-GPeg3350/Sod Sulf,bicarb,cl/Kcl | 21 | $402 |
| Carvedilol | 25 | $249 |
| Vitamin D2Ergocalciferol (Vitamin D2) | 14 | $219 |
| Peg-3350 And ElectrolytesPeg3350/Sod Sulf,bicarb,cl/Kcl | 11 | $189 |
| Pantoprazole Sodium | 20 | $131 |
| Hydroxyzine Hcl | 14 | $108 |
| Prednisone | 12 | $49 |
| Ondansetron Hcl | 21 | $21 |
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 |
|---|---|---|
| Intercept Pharmaceuticals, Inc.Ocaliva | $5,659 | $523,42154 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 22 hepatology providers in Texas.
Other hepatology in Dallas
- Amit SingalDallas$534K
- Willis MaddreyDallas$289K
- William LeeDallas$101K
- Robert RahimiDallas$18K
- Gary DavisDallas$9K
- Maria Lepe-SuasteguiDallas$4K
- Ussama GhummanDallas$1K
- Sarah LieberDallas$285
- Joseph GalatiHouston$211K
- Hesham ElgouhariDenison$147K
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.