Robert Riordan Mac Donald, M.D.
Otolaryngology Physician · Saint Peters, MO
Robert Riordan Mac Donald, M.D. is an otolaryngology physician with a practice address in Saint Peters, Missouri, and NPI 1861417156, issued on Jul 13, 2006. Check the license (Missouri MO103596, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Robert Riordan Mac Donald
- Credential
- M.D.
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- MO103596 MO
Self-reported in NPPES; status is on the state search - Practice location
- 4790 Executive Centre Pkwy, Saint Peters, MO 63376
- Phone
- (636) 441-3100
- Enumerated
- Jul 13, 2006
- Record last updated
- Apr 11, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (636) 441-6784
- Medicare enrollment
- Enrolled (PECOS I20110323000563); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 1989
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 253 in Missouri → Look up another NPI →
Also registered at 4790 Executive Centre Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Karen Boone, M.D.Otolaryngology Physician1841215126
- Benjamin Conoyer, M.D.Otolaryngology Physician1184817629
- John Conoyer, M.D.Otolaryngology Physician1295750586
- Sandi Fontecchio, AU.D.Audiologist1255581765
- Trisha HackmanAudiologist1851567911
- Matthew Page, MDOtolaryngology Physician1356445530
Verify Robert Riordan Mac Donald in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license MO103596Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average otolaryngology physician in 2024
1,110 Medicare Part D claims for 456 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D. Brand-name drugs were 5% of claims. 39 claims were for opioids.
Most prescribed
- Fluticasone Propionate185 claims
- Montelukast Sodium124 claims
- Prednisone114 claims
- Ipratropium Bromide109 claims
- Methylprednisolone60 claims
- Cefdinir47 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $236.73
10 payments; by number, the most common kind was food and beverage; the largest payer was Regeneron Healthcare Solutions, Inc. The 6,429 providers of this specialty with any payment received $1,922.50 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Midwest Ent Centre, PCSaint Peters, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Riordan Mac Donald among 253 otolaryngology physician records in Missouri
Robert Riordan Mac Donald, M.D. is one of 253 otolaryngology physician records with a practice address in Missouri. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 11% of them.
- NPI issued2006 · 11% of these records are older, 60% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1989 · median 2007 among the 148 with a school on file
- Record last updated2012 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in Missouri
There are 253 otolaryngology physician records in Missouri.
All 253 in Missouri → Every provider in Saint Peters → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Karen Boone, M.D.Saint Peters, MO 633761841215126
- John Conoyer, M.D.Saint Peters, MO 633761295750586
- Benjamin Conoyer, M.D.Saint Peters, MO 633761184817629
- John Conoyer, M.D.St Peters, MO 633761881875961
- Matthew Page, MDSaint Peters, MO 633761356445530
- Martin Willman, M.D.Saint Peters, MO 633761194758698
- Robert Cristel, MDO Fallon, MO 633681568999001
- Robert Loynd, M.D.St Charles, MO 633011972043107
Common questions
What is Robert Riordan Mac Donald, M.D.'s NPI number?
Robert Riordan Mac Donald, M.D.'s National Provider Identifier (NPI) is 1861417156, issued on Jul 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Riordan Mac Donald, M.D. located?
The NPPES record lists a practice address at 4790 Executive Centre Pkwy, Saint Peters, MO, 63376. Phone: (636) 441-3100. Providers update this record themselves, so call before visiting.
How can I verify Robert Riordan Mac Donald, M.D.'s license?
NPPES lists Missouri license number MO103596, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert Riordan Mac Donald, M.D. prescribe under Medicare Part D?
In 2024, Robert Riordan Mac Donald, M.D. had 1,110 Medicare Part D claims for 456 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
What is Robert Riordan Mac Donald, M.D.'s MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.