Milliette Alvarado-Santiago, M.D.
NPI 1821306127ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Rio Piedras, PR
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Rio Piedras, Puerto Rico, trained at University of Puerto Rico School of Medicine (class of 2010). Their prescriptions cost Medicare Part D more than their services did: $1,023,007 for 2,921 claims, against $1,753 paid for services in 2024. Lilly USA, LLC was the largest of 15 companies reporting payments in 2025, $31,277 in all, mostly speaking and faculty fees.
Overview
| NPI | 1821306127 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 21, 2010 |
| Last updated in NPPES | Aug 6, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 20554 | PR |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 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 | 16 |
|---|---|
| Services billed | 27 across 6 procedure codes |
| Paid by Medicare | $1,753 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,921 · 3,790 30-day fills |
|---|---|
| Patients | 248 |
| Total drug cost | $1,023,007 |
| Generic share | 29% of claims |
Education and affiliations
| Medical school | University of Puerto Rico School of Medicine |
|---|---|
| Graduation year | 2010 |
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
Medical groups
- Recinto de Ciencias MedicasCarolina, PR · 247 clinicians
- New Vision Medical Diagnostics LLCBayamon, PR · 5 clinicians
Hospital affiliation
- Hospital Upr, Dr Federico TrillaCarolina, PR
Industry payments (Open Payments)
- 2025$31,277 · 65 payments from 15 companies
- 2024$37,853 · 103 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $20,779 | 29 |
| Rhythm Pharmaceuticals, Inc. | $7,660 | 7 |
| Eli Lilly Export S.A. Puerto Rico Branch | $2,165 | 7 |
| Novo Nordisk Inc | $151.79 | 3 |
| Corcept Therapeutics | $125.39 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$20,650 · 21 payments
- Honoraria$7,465 · 2 payments
- Food and Beverage$1,590 · 38 payments
- Travel and Lodging$1,572 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other endocrinologists in Rio Piedras
- 1144427758
- 1841275104