Marielly Sierra Mercado, M.D.
NPI 1013258482ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· San Juan, PR
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in San Juan, Puerto Rico, licensed in PR, with an NPI issued in March 2013. Their prescriptions cost Medicare Part D more than their services did: $1,691,565 for 6,925 claims, against $8,969 paid for services in 2024. Sanofi-Aventis U.S. LLC was the largest of 3 companies reporting payments in 2025, $707.33 in all, mostly food and beverage. Lists Bayamon Medical Center as a hospital affiliation.
Overview
| NPI | 1013258482 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 11, 2013 |
| Last updated in NPPES | Jul 26, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 19192 | PR |
| Internal Medicine | 207R00000X | 19192 | PR |
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 - Endocrinology (PR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 44 |
|---|---|
| Services billed | 154 across 8 procedure codes |
| Paid by Medicare | $8,969 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,925 · 9,316 30-day fills |
|---|---|
| Patients | 423 |
| Total drug cost | $1,691,565 |
| Generic share | 43% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Endocrinology |
Hospital affiliation
- Bayamon Medical CenterBayamon, PR
Industry payments (Open Payments)
- 2025$707.33 · 6 payments from 3 companies
- 2024$935.84 · 11 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Sanofi-Aventis U.S. LLC | $519.37 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $121.12 | 1 |
| Amgen Inc. | $66.84 | 1 |
What the 2025 payments were for
- Food and Beverage$707.33 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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