Robert Riordan Mac Donald, M.D.
NPI 1861417156ActiveIndividual· Otolaryngology· Saint Peters, MO
Otolaryngology (M.D.) in Saint Peters, Missouri, trained at Washington University School of Medicine (class of 1989). 488 Medicare patients in 2024, $115,299 paid; nearly all of their 1,110 Part D prescriptions were generic (95%). Aerin Medical Inc. was the largest of 7 companies reporting payments in 2025, $1,759 in all, mostly travel and lodging.
Overview
| NPI | 1861417156 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 13, 2006 |
| Last updated in NPPES | Apr 11, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Otolaryngology Primary | 207Y00000X | MO103596 | MO |
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 - Otolaryngology (MO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 488 |
|---|---|
| Services billed | 3,627 across 52 procedure codes |
| Paid by Medicare | $115,299 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,110 · 1,523 30-day fills |
|---|---|
| Patients | 456 |
| Total drug cost | $24,128 |
| Generic share | 95% of claims |
Education and affiliations
| Medical school | Washington University School of Medicine |
|---|---|
| Graduation year | 1989 |
| Medicare specialty | Otolaryngology |
| Secondary specialties | Allergy/Immunology |
Medical group
- Midwest ENT Centre, PCSaint Peters, MO · 12 clinicians
Hospital affiliations
- Barnes-Jewish St Peters HospitalSaint Peters, MO
- Mercy Hospital St LouisSaint Louis, MO
- Progress West HospitalOfallon, MO
- Ssm St Joseph Hospital WestLake Saint Louis, MO
- St Lukes HospitalChesterfield, MO
Industry payments (Open Payments)
- 2025$1,759 · 14 payments from 7 companies
- 2024$236.73 · 10 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aerin Medical Inc. | $1,591 | 8 |
| Stryker Corporation | $46.56 | 1 |
| Regeneron Healthcare Solutions, Inc. | $32.28 | 1 |
| Neurent Medical Limited | $28.95 | 1 |
| Ars Pharmaceuticals Operations, Inc. | $23.00 | 1 |
What the 2025 payments were for
- Travel and Lodging$1,131 · 3 payments
- Food and Beverage$627.06 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Otolaryngology providers in Saint Peters
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