Ramon Arenas Guadiz, M.D.
NPI 1003998147ActiveIndividual· Internal Medicine, Nephrology· Lynwood, CA
Internal Medicine, Nephrology (M.D.) with Renal Medical Associates, practicing in Lynwood, California. Their prescriptions cost Medicare Part D more than their services did: $517,695 for 2,036 claims, against $110,366 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 2 companies reporting payments in 2025, $95.10 in all, mostly food and beverage. Lists Coast Plaza Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1003998147 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 19, 2006 |
| Last updated in NPPES | Dec 20, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A72478 | CA |
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 - Neurology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 149 |
|---|---|
| Services billed | 698 across 16 procedure codes |
| Paid by Medicare | $110,366 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,036 · 4,539 30-day fills |
|---|---|
| Patients | 274 |
| Total drug cost | $517,695 |
| Generic share | 68% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Neurology |
| Secondary specialties | Internal Medicine |
Medical group
- Renal Medical AssociatesLynwood, CA · 3 clinicians
Hospital affiliations
- Coast Plaza HospitalNorwalk, CA
- Saint Francis Medical CenterLynwood, CA
Other facilities
- Davita Firestone Blvd DialysisDialysis facility · Norwalk, CA
- Davita Imperial Care Dialysis CenterDialysis facility · Lynwood, CA
- Davita Kidney Dialysis Care UnitDialysis facility · Lynwood, CA
- Davita Premier Dialysis CenterDialysis facility · Cudahy, CA
- Davita United Dialysis CenterDialysis facility · Long Beach, CA
Industry payments (Open Payments)
- 2025$95.10 · 5 payments from 2 companies
- 2024$108.78 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $53.08 | 3 |
| Fresenius USA Marketing, Inc. | $42.02 | 2 |
What the 2025 payments were for
- Food and Beverage$95.10 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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