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DR. MICHAEL JAMES RIERMAIER M.D.
NPI 1376650135
Obstetrics & Gynecology - Obstetrics in Elgin, IL

Active since August 25, 2006PECOS EnrolledCLIA 14D0910227 · Waiver
1435 N RANDALL RD STE 304, ELGIN, IL 60123(847) 697-7722(847) 697-7896 Get Directions Write a Review

NPPES record last updated: September 18, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Michael James Riermaier M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MICHAEL JAMES RIERMAIER M.D. (NPI 1376650135) is an individual obstetrics provider in Elgin, Illinois, licensed in Illinois (363816770) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, holds a CLIA Waiver certificate valid through January 1, 2028, and is a graduate of Other (1980).

NPPES Registry Identity

NPI1376650135
Entity TypeIndividualMale
Primary Taxonomy207VX0000X
Provider Legal NameDR. MICHAEL JAMES RIERMAIERCredential: M.D.
Location Address1435 N RANDALL RD STE 304Elgin, IL 60123-2304
Mailing Address1435 N Randall Rd Ste 304Elgin, IL 60123-2304 · (847) 697-7722 · Fax (847) 697-7896
Phone(847) 697-7722
Fax(847) 697-7896
Sole ProprietorNo
Medical School CMSOtherGraduated 1980
Enumeration DateAugust 25, 2006
Last NPPES UpdateSeptember 18, 2012
✔ NPI 1376650135 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · ObstetricsAllopathic & Osteopathic Physicians
Taxonomy Code207VX0000X
License✔ Licensed in IL · 363816770
Definition
A physician who specializes in diagnosis, treatment, and management of patients with obstetric conditions. Source: National Uniform Claim Committee
1435 N RANDALL RD STE 304, Elgin, IL 60123
Open in Google Maps ↗

Other Identifiers 3

Medicaid036065268IL
Medicare ID-Type Unspecified201498IL
Medicare UPINC38286IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Michael James Riermaier M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID2961698949
PECOS Enrollment IDI20101202000605
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Michael Riermaier reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Obhg Illinois Sc
32 mi
Obstetrics & Gynecology
3249 OAK PARK AVE
Berwyn, IL 60402
  • Reassigned Medicare billing, Illinois enrollment
  • 219 clinicians in this Medicare group
NPI 1700107216 (800) 967-2289

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 14D0910227

Michael J Riermaier MD Jr Sc · Elgin, IL
Active · expires Jan 1, 2028
CLIA Number14D0910227
Laboratory TypePhysician Office
Certificate Effective DateJanuary 2, 2026
Certificate Expiration DateJanuary 1, 2028
Laboratory DirectorMichael J. Riermaier MD
Laboratory Phone(847) 697-7722
Laboratory LocationMichael J Riermaier MD Jr Sc1435 N Randall Rd, Ste 304, Elgin, IL 60123
CLIA data matches this NPI record on: Address Phone
This certificate is issued to a laboratory to perform only waived tests.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60123 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$137.43 typical visit price
range $59.81 – $181.38
Typical copayment $34.35 (range $14.95 – $45.34)
Most-billed visit code 99204
Established Patient
$74.38 typical visit price
range $19.15 – $147.12
Typical copayment $18.59 (range $4.78 – $36.78)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

GLENDA M EMBRY CNM
Advanced Practice Midwife
1435 N RANDALL RD STE 304
ELGIN, IL 60123
Kane County (847) 697-7722

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Michael Riermaier's NPI number?

The NPI number for Michael Riermaier is 1376650135. It was assigned to this individual provider in the NPPES registry on August 25, 2006.

Where is Michael Riermaier located?

Michael Riermaier practices at 1435 N Randall Rd Ste 304, Elgin, IL 60123. The listed phone number is (847) 697-7722.

What is Michael Riermaier's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Obstetrics, with taxonomy code 207VX0000X.

Is Michael Riermaier enrolled in Medicare?

Yes. Michael Riermaier is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Michael Riermaier's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Riermaier reassigns Medicare benefits to Obhg Illinois Sc (Berwyn, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Michael Riermaier's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Does Michael Riermaier hold a CLIA laboratory certificate?

Yes. A Certificate of Waiver (number 14D0910227) is associated with this NPI, valid through January 1, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.

What insurance does Michael Riermaier accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Michael Riermaier as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Michael Riermaier was last updated on September 18, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.