Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jeffrey Allyn Hassenflug, M.D.

Emergency Medicine Physician in Maryville, IL · enumerated 2013.

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

National Provider Identifier

1407299126

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Registry record

Entity type Individual (Type 1)

Name Jeffrey Allyn Hassenflug

Credential M.D.

Sex Male

Practice address 2081 Briarbend Ct, Maryville, IL, 62062

Phone (816) 567-3372

Enumeration date Apr 11, 2013

Last updated in NPPES Apr 6, 2017

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License Q9370 (TX) 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 Jeffrey Hassenflug?

The National Provider Identifier (NPI) for Jeffrey Hassenflug is 1407299126, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jeffrey Hassenflug practice?

The practice location on file with NPPES is in Maryville, IL. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-04-06.