Robert A. Mairs, DO
Obstetrics & Gynecology Physician · Ontario, OR
Robert A. Mairs, DO is an obstetrics & gynecology physician with a practice address in Ontario, Oregon, and NPI 1124001862, issued on Nov 28, 2005. Check the license (Oregon DO20644, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert A. Mairs
- Credential
- DO
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License numbers
- DO20644 OR
O-186 ID
Self-reported in NPPES; status is on the state search - Practice location
- 1050 SW 3RD Ave Ste 3200, Ontario, OR 97914
- Phone
- (541) 881-2325
- Enumerated
- Nov 28, 2005
- Record last updated
- Sep 23, 2025
- Fax
- (208) 914-6701
- Medicaid ID
- 804163300 ID
- Medicare enrollment
- Enrolled (PECOS I20040809001274); accepts Medicare assignment
- Medical or professional school
- At Still University Of Health Sciences, College Of Osteo Med, Kirksville, 1993
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 654 in Oregon → Look up another NPI →
Verify Robert A. Mairs in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license DO20644Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
328 Medicare Part D claims for 63 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Estradiol103 claims
- Progesterone39 claims
- Fluconazole22 claims
- Dasetta16 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 MIPS final score for 2023 (Medicare payment program): 97.6 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
2 hospitals and group practices
- Harney District HospitalBurns, OR · Critical Access Hospitals
- Saint Alphonsus Medical Center- Ontario IncOntario, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Robert A. Mairs among 654 obstetrics & gynecology physician records in Oregon
Robert A. Mairs, DO is one of 654 obstetrics & gynecology physician records with a practice address in Oregon. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 89% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2007 among the 413 with a school on file
- Record last updated2025 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Oregon practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Oregon
There are 654 obstetrics & gynecology physician records in Oregon.
All 654 in Oregon → Every provider in Ontario → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- James Roth, M.D.Ontario, OR 979141104895705
- William Stinger, D.O.Ontario, OR 979141922313253
- Brandye Wilson-Manigat, M.D.Ontario, OR 979141639328412
- Milo Hibbert, M.D.La Grande, OR 978501689604233
- Dawn Knight, M.D.La Grande, OR 978501689699787
- Soren MadsenLa Grande, OR 978501457001398
- Ralph Oler, M.D.La Grande, OR 978501104867852
- Jeanna Romer, M.DLa Grande, OR 978501205276003
Common questions
What is Robert A. Mairs, DO's NPI number?
Robert A. Mairs, DO's National Provider Identifier (NPI) is 1124001862, issued on Nov 28, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Robert A. Mairs, DO located?
The NPPES record lists a practice address at 1050 SW 3RD Ave Ste 3200, Ontario, OR, 97914. Phone: (541) 881-2325. Providers update this record themselves, so call before visiting.
How can I verify Robert A. Mairs, DO's license?
NPPES lists Oregon license number DO20644, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert A. Mairs, DO prescribe under Medicare Part D?
In 2024, Robert A. Mairs, DO had 328 Medicare Part D claims for 63 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Robert A. Mairs, DO's MIPS final score?
The 2023 MIPS final score is 97.6 of 100. 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.