Marlyn Jean Mayo, MD
NPI 1003872292ActiveIndividual· Internal Medicine, Hepatology· Dallas, TX
Internal Medicine, Hepatology (MD) in Dallas, Texas, trained at Baylor College of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $846,508 for 580 claims, against $16,272 paid for services in 2024. Mirum Pharmaceuticals, Inc. was the largest of 5 companies reporting payments in 2025, $8,829 in all, mostly consulting fees.
Overview
| NPI | 1003872292 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 25, 2006 |
| Last updated in NPPES | Apr 3, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hepatology Primary | 207RI0008X | J0852 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 116 |
|---|---|
| Services billed | 200 across 24 procedure codes |
| Paid by Medicare | $16,272 |
Part D prescriptions in 2024
| Prescriptions (claims) | 580 · 1,060 30-day fills |
|---|---|
| Patients | 144 |
| Total drug cost | $846,508 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | Baylor College of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- University of Texas Southwestern Medical Center at DallasDallas, TX · 3,187 clinicians
Hospital affiliations
Industry payments (Open Payments)
- 2025$8,829 · 14 payments from 5 companies
- 2024$14,866 · 10 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Mirum Pharmaceuticals, Inc. | $6,398 | 9 |
| Intercept Pharmaceuticals, Inc. | $2,080 | 2 |
| Gilead Sciences, Inc. | $137.34 | 1 |
| Perspectum Diagnostics Ltd | $133.00 | 1 |
| Ipsen Biopharmaceuticals, Inc | $81.14 | 1 |
What the 2025 payments were for
- Consulting Fee$7,280 · 3 payments
- Travel and Lodging$894.42 · 3 payments
- Food and Beverage$654.83 · 8 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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