Ranil S. Gajanayaka, MD
NPI 1841452380ActiveIndividual· Internal Medicine, Nephrology· Irving, TX
Internal Medicine, Nephrology (MD) with Mercy Clinic Oklahoma Communities and 3 other groups, practicing in Irving, Texas. In 2024 Medicare paid $220,095 for 541 patients, and Part D covered 1,590 of their prescriptions, 86% of them generic. Amgen Inc. was the largest of 10 companies reporting payments in 2025, $512.94 in all, mostly food and beverage. Lists Baylor Scott & White Medical Center Grapevine and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1841452380 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 26, 2008 |
| Last updated in NPPES | Nov 15, 2023 |
| Certified by provider | Nov 15, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | Q4580 | TX |
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 (MN); Practitioner - Hospitalist (OK); Practitioner - Nephrology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 541 |
|---|---|
| Services billed | 3,901 across 36 procedure codes |
| Paid by Medicare | $220,095 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,590 · 3,478 30-day fills |
|---|---|
| Patients | 268 |
| Total drug cost | $302,485 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 2003 |
|---|---|
| Medicare specialty | Hospitalist |
| Telehealth | Offers telehealth |
Medical groups
- Mercy Clinic Oklahoma CommunitiesOklahoma City, OK · 649 clinicians
- Range Regional Health ServicesHibbing, MN · 353 clinicians
- Dallas Nephrology AssociatesIrving, TX · 157 clinicians
- Comanche County Healthcare CorporationLawton, OK · 130 clinicians
Hospital affiliations
- Baylor Scott & White Medical Center GrapevineGrapevine, TX
- Medical City Las ColinasIrving, TX
- Memorial HealthLawton, OK
- Mercy Hospital Ardmore, IncArdmore, OK
- Methodist Southlake Medical CenterSouthlake, TX
Other facilities
- Davita Grapevine DialysisDialysis facility · Grapevine, TX
- Fkc GrapevineDialysis facility · Grapevine, TX
Industry payments (Open Payments)
- 2025$512.94 · 26 payments from 10 companies
- 2024$272.11 · 12 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $196.88 | 9 |
| Otsuka America Pharmaceutical, Inc. | $93.15 | 4 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $76.57 | 4 |
| Astrazeneca Pharmaceuticals LP | $40.10 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $29.96 | 1 |
What the 2025 payments were for
- Food and Beverage$473.19 · 22 payments
- Education$39.75 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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