Alfonso A. Ortiz, MD
NPI 1699915967ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Las Vegas, NV
Internal Medicine, Endocrinology, Diabetes & Metabolism (MD) with Essen Medical Associates, PC and 1 other group, practicing in Las Vegas, Nevada. Their prescriptions cost Medicare Part D more than their services did: $347,148 for 866 claims, against $2,630 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 2 companies reporting payments in 2025, $85.68 in all, mostly food and beverage.
Overview
| NPI | 1699915967 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Feb 26, 2009 |
| Last updated in NPPES | Jun 6, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 170235 | NY |
| Internal Medicine | 207R00000X | 17966 | NV |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (NY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 21 |
|---|---|
| Services billed | 29 across 2 procedure codes |
| Paid by Medicare | $2,630 |
Part D prescriptions in 2024
| Prescriptions (claims) | 866 · 1,298 30-day fills |
|---|---|
| Patients | 171 |
| Total drug cost | $347,148 |
| Generic share | 43% of claims |
Education and affiliations
| Graduation year | 1983 |
|---|---|
| Medicare specialty | Endocrinology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Essen Medical Associates, PCBronx, NY · 266 clinicians
- Shakespeare Operating LLCBronx, NY · 151 clinicians
Industry payments (Open Payments)
- 2025$85.68 · 3 payments from 2 companies
- 2024$120.26 · 3 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $60.30 | 2 |
| Corcept Therapeutics | $25.38 | 1 |
What the 2025 payments were for
- Food and Beverage$85.68 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Las Vegas
- 1508664905
- 1245230242
- 1073931952
- 1265906937
- 1932156452
- 1396615514
- 1326786856
- 1154447399
- 1942403365
- 1275778599
- 1811245400
- 1538044979
All Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Nevada →