Michael James Riermaier, M.D.
Obstetrics Physician · Elgin, IL
Michael James Riermaier, M.D. is an obstetrics physician with a practice address in Elgin, Illinois, and NPI 1376650135, issued on Aug 25, 2006. Check the license (Illinois 363816770, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Michael James Riermaier
- Credential
- M.D.
- Primary taxonomy
- Obstetrics Physician 207VX0000X
- License number
- 363816770 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1435 N Randall RD Ste 304, Elgin, IL 60123
- Phone
- (847) 697-7722
- Enumerated
- Aug 25, 2006
- Record last updated
- Sep 18, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (847) 697-7896
- Medicaid ID
- 036065268 IL
- Medicare enrollment
- Enrolled (PECOS I20101202000605); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest obstetrics physician records → All 54 in Illinois → Look up another NPI →
Also registered at 1435 N Randall RD Ste 304
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Glenda Embry, CNMAdvanced Practice Midwife1033433214
Verify Michael James Riermaier in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 363816770Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
62% fewer Medicare Part D claims than the average obstetrics physician in 2024
82 Medicare Part D claims for 17 beneficiaries, against an average of 218 among the 863 providers of this specialty who prescribed in Part D.
Most prescribed
- Prempro14 claims
- Fluconazole12 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.
Industry payments in 2024: $133.40
7 payments; by number, the most common kind was food and beverage; the largest payer was CooperSurgical, Inc. The 679 providers of this specialty with any payment received $826.19 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.
Michael James Riermaier among 54 obstetrics physician records in Illinois
Michael James Riermaier, M.D. is one of 54 obstetrics physician records with a practice address in Illinois. 80% 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 13% of them.
- NPI issued2006 · 13% of these records are older, 69% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1980 · median 2005 among the 35 with a school on file
- Record last updated2012 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VX0000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics Physician providers in Illinois
There are 54 obstetrics physician records in Illinois.
All 54 in Illinois → Every provider in Elgin → Obstetrics Physician nationwide →
The 8 obstetrics physician records with the nearest ZIP codes
- Christopher Michael, M.D.Elgin, IL 601231770581282
- Phyllis Chang, MDGeneva, IL 601341265654735
- Aprilee Gostomski, MDGeneva, IL 601341457872400
- Rakhi Shah, DOGeneva, IL 601341952450652
- Marianne Krupka, D.O.Huntley, IL 601421215382999
- Colleen Stobinski, MDHoffman Estates, IL 601691851913818
- Lauren Thomas, DOHoffman Estates, IL 601691275235525
- John Bush, M.D.Park Ridge, IL 600681710120779
Common questions
What is Michael James Riermaier, M.D.'s NPI number?
Michael James Riermaier, M.D.'s National Provider Identifier (NPI) is 1376650135, issued on Aug 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Michael James Riermaier, M.D. located?
The NPPES record lists a practice address at 1435 N Randall RD Ste 304, Elgin, IL, 60123. Phone: (847) 697-7722. Providers update this record themselves, so call before visiting.
How can I verify Michael James Riermaier, M.D.'s license?
NPPES lists Illinois license number 363816770, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Michael James Riermaier, M.D. prescribe under Medicare Part D?
In 2024, Michael James Riermaier, M.D. had 82 Medicare Part D claims for 17 beneficiaries; the average among obstetrics physician prescribers was 218. Part D covers Medicare prescriptions only.
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.