Guillermo Alfredo Mendoza Fonseca, M.D.
NPI 1285898288ActiveIndividual· General Practice· Oviedo, FL
General Practice (M.D.) with Ability Health Services and Rehabilitation LP and 1 other group, practicing in Oviedo, Florida. Their prescriptions cost Medicare Part D more than their services did: $555,781 for 5,435 claims, against $50,983 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $624.10 in all, mostly food and beverage. Lists Adventhealth Orlando as a hospital affiliation.
Overview
| NPI | 1285898288 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 18, 2008 |
| Last updated in NPPES | Mar 7, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| General Practice Primary | 208D00000X | ME117112 | FL |
| Internal Medicine | 207R00000X | ME117112 | FL |
| Internal Medicine | 207R00000X | MD12761 | RI |
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 - Internal Medicine (FL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 76 |
|---|---|
| Services billed | 1,172 across 27 procedure codes |
| Paid by Medicare | $50,983 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,435 · 12,111 30-day fills |
|---|---|
| Patients | 293 |
| Total drug cost | $555,781 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 2001 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Ability Health Services and Rehabilitation LPSanford, FL · 1,269 clinicians
- Ability Health Services, IncSanford, FL · 1,258 clinicians
Hospital affiliation
- Adventhealth OrlandoOrlando, FL
Other facilities
- Adventhealth Home HealthHome health agency · Altamonte Springs, FL
Industry payments (Open Payments)
- 2025$624.10 · 35 payments from 10 companies
- 2024$797.61 · 40 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $270.11 | 16 |
| Novo Nordisk Inc | $68.14 | 4 |
| Lilly USA, LLC | $64.28 | 4 |
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $54.36 | 3 |
| Corcept Therapeutics | $41.39 | 2 |
What the 2025 payments were for
- Food and Beverage$624.10 · 35 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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