Maricela. Lizzette Guzman, NP
NPI 1437811528ActiveIndividual· Nurse Practitioner, Family· El Centro, CA
Nurse Practitioner, Family (NP) with S H Ahmed MD PHD Inc, practicing in El Centro, California. Their prescriptions cost Medicare Part D more than their services did: $886,142 for 528 claims, against $71,745 paid for services in 2024. Eisai Inc. was the largest of 14 companies reporting payments in 2025, $510.98 in all, mostly food and beverage. Lists El Centro Regional Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1437811528 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | NP |
| Sole proprietor | No |
| NPI issued | Oct 6, 2021 |
| Last updated in NPPES | Oct 6, 2021 |
| Certified by provider | Oct 6, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Family Primary | 363LF0000X | 95018507 | CA |
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 - Nurse Practitioner (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 655 |
|---|---|
| Services billed | 1,260 across 9 procedure codes |
| Paid by Medicare | $71,745 |
Part D prescriptions in 2024
| Prescriptions (claims) | 528 · 755 30-day fills |
|---|---|
| Patients | 166 |
| Total drug cost | $886,142 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2021 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- S H Ahmed MD PHD IncEl Centro, CA · 3 clinicians
Hospital affiliations
- El Centro Regional Medical CenterEl Centro, CA
- Pioneers Memorial Healthcare DistrictBrawley, CA
- Yuma Regional Medical CenterYuma, AZ
Industry payments (Open Payments)
- 2025$510.98 · 20 payments from 14 companies
- 2024$675.21 · 24 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Eisai Inc. | $123.84 | 4 |
| Karyopharm Therapeutics Inc. | $96.14 | 3 |
| Glaxosmithkline, LLC. | $46.25 | 2 |
| Pharmaessentia USA Corporation | $31.86 | 1 |
| Taiho Oncology, Inc. | $30.87 | 1 |
What the 2025 payments were for
- Food and Beverage$510.98 · 20 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 69 family nurse practitioners in El Centro · All family nurse practitioners in California