NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Gilbert Felker, MD

Diagnostic Radiology Physician in Glen Ellyn, IL · enumerated 2006.

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

National Provider Identifier

1679514996

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Dr. John Gilbert Felker
Credential MD
Sex Male
Practice address 430 Pennsylvania Ave Ste 110, Glen Ellyn, IL, 60137
Phone (630) 946-2020
Fax (630) 432-6754
Enumeration date Jun 9, 2006
Last updated in NPPES Aug 7, 2023

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 036098949 (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

What is the NPI number for John Felker?
The National Provider Identifier (NPI) for John Felker is 1679514996, a Type 1 (individual) record in the CMS NPPES registry.
Where does John Felker practice?
The practice location on file with NPPES is in Glen Ellyn, IL. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-07.