NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael J Riermaier MD Jd Sc

Obstetrics & Gynecology Physician in Elgin, IL · enumerated 2010 · authorized official Diane Smith, Cnm/Office Manager.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1477863942

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Michael J Riermaier MD Jd Sc
Practice address 1435 N Randall Rd, Ste 304, Elgin, IL, 60123
Phone (847) 697-7722
Fax (847) 697-7852
Enumeration date Oct 18, 2010
Last updated in NPPES Nov 10, 2010

Taxonomy & classification

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 036065268 (IL) Primary

Authorized official

Name Diane Smith
Title Cnm/Office Manager
Phone (847) 697-7722

Other identifiers

Identifier Type State Issuer
036065268 Medicaid IL -

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Michael J Riermaier MD Jd Sc?
The NPI for Michael J Riermaier MD Jd Sc is 1477863942, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Michael J Riermaier MD Jd Sc?
NPPES lists Diane Smith (Cnm/Office Manager) as the authorized official for this organization.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-11-10.