Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Eric Gerard Toennies, DC
Chiropractor in O Fallon, IL · enumerated 2018.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1952819971
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Registry record
Entity type Individual (Type 1)
Name Dr. Eric Gerard Toennies
Credential DC
Sex Male
Practice address 904 E Highway 50, O Fallon, IL, 62269
Phone (618) 589-9400
Enumeration date Jan 11, 2018
Last updated in NPPES Aug 10, 2018
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC credential
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.
Frequently asked questions
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Eric Toennies?
Eric Toennies is registered in NPPES with the primary taxonomy of Chiropractor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Spring Valley Dental Group Ltd Dentist · O Fallon, IL NPI 1013008978 Lance Martin General Practice Dentistry · O Fallon, IL NPI 1326215484 Ronald Ames General Practice Dentistry · O Fallon, IL NPI 1235306994 Aaron Oge' General Practice Dentistry · O Fallon, IL NPI 1417124058 Eric Toennies LLC Chiropractor · O Fallon, IL NPI 1730687831 Spring Valley Dental Associates LLC Dentist · O Fallon, IL NPI 1154040830 Skyler Sparks Chiropractor · O Fallon, IL NPI 1609723923
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-10.