NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dorrie C Tredway, MD

Family Medicine Physician in O Fallon, IL · enumerated 2005.

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

National Provider Identifier

1891787040

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dorrie C Tredway
Credential MD
Sex Female
Practice address 1512 N Green Mount Rd, Suite 108, O Fallon, IL, 62269
Phone (618) 624-5510
Fax (618) 624-5529
Enumeration date Aug 15, 2005
Last updated in NPPES Dec 20, 2021

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 2008010712 (MO) Secondary
207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 036108951 (IL) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Dorrie Tredway's NPI record?
Cross-check NPI 1891787040 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1891787040 active?
Yes, as of the latest NPPES snapshot, NPI 1891787040 is active (record last updated 2021-12-20).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-20.