Nelson Rafael Kalaf, MD
NPI 1205858107ActiveIndividual· Internal Medicine· McAllen, TX
Internal Medicine (MD) with Nelson R. Kalaf, MD P.A., practicing in McAllen, Texas. Their prescriptions cost Medicare Part D more than their services did: $1,936,531 for 16,019 claims, against $49,917 paid for services in 2024. Exact Sciences Corporation was the largest of 3 companies reporting payments in 2025, $84.67 in all, mostly food and beverage. Lists Doctors Hosptal at Renaissance and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1205858107 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 23, 2006 |
| Last updated in NPPES | Oct 2, 2026 |
| Certified by provider | Oct 2, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | L 0307 | TX |
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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 156 |
|---|---|
| Services billed | 1,218 across 35 procedure codes |
| Paid by Medicare | $49,917 |
Part D prescriptions in 2024
| Prescriptions (claims) | 16,019 · 38,938 30-day fills |
|---|---|
| Patients | 1,156 |
| Total drug cost | $1,936,531 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 1989 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Nelson R. Kalaf, MD P.A.Mission, TX · 2 clinicians
Hospital affiliations
- Doctors Hosptal at RenaissanceEdinburg, TX
- Mission Regional Medical CenterMission, TX
- Rio Grande Regional HospitalMcAllen, TX
Other facilities
- Life Touch Home Health Services, LLCHome health agency · Edinburg, TX
Industry payments (Open Payments)
- 2025$84.67 · 4 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Exact Sciences Corporation | $40.30 | 2 |
| Pfizer Inc. | $27.40 | 1 |
| Amgen Inc. | $16.97 | 1 |
What the 2025 payments were for
- Food and Beverage$84.67 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 88 internal medicine physicians in McAllen · All internal medicine physicians in Texas