Magha Sirimevan Dissanayake, MD
NPI 1578545182ActiveIndividual· Internal Medicine· Springfield, OR
Internal Medicine (MD) with Praxis Health PC, practicing in Springfield, Oregon. Their prescriptions cost Medicare Part D more than their services did: $655,796 for 8,011 claims, against $61,233 paid for services in 2024. Pfizer Inc. was the largest of 22 companies reporting payments in 2025, $1,635 in all, mostly food and beverage. Lists McKenzie-Willamette Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1578545182 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Nov 18, 2005 |
| Last updated in NPPES | Dec 27, 2022 |
| Certified by provider | Dec 27, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | MD21258 | OR |
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 (OR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 223 |
|---|---|
| Services billed | 1,266 across 40 procedure codes |
| Paid by Medicare | $61,233 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,011 · 16,058 30-day fills |
|---|---|
| Patients | 671 |
| Total drug cost | $655,796 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 1986 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Praxis Health PCTigard, OR · 171 clinicians
Hospital affiliations
- McKenzie-Willamette Medical CenterSpringfield, OR
- Sacred Heart Medical Center - RiverbendSpringfield, OR
Other facilities
- Signature Healthcare at HomeHome health agency · Eugene, OR
Industry payments (Open Payments)
- 2025$1,635 · 103 payments from 22 companies
- 2024$988.08 · 53 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $385.07 | 29 |
| Astrazeneca Pharmaceuticals LP | $245.78 | 27 |
| Novo Nordisk Inc | $209.04 | 11 |
| Glaxosmithkline, LLC. | $159.82 | 7 |
| Abbvie Inc. | $88.10 | 3 |
What the 2025 payments were for
- Food and Beverage$1,603 · 101 payments
- Education$31.98 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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