Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jack Leon Gregston, MD

Diagnostic Radiology Physician in Springfield, MO · enumerated 2007.

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

National Provider Identifier

1225177447

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Registry record

Entity type Individual (Type 1)

Name Dr. Jack Leon Gregston

Credential MD

Sex Male

Practice address 1235 E Cherokee St, Springfield, MO, 65804

Phone (417) 820-2500

Fax (417) 820-8155

Enumeration date Feb 5, 2007

Last updated in NPPES Apr 27, 2009

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 104377 (MO) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
173098	Other	MO	MO BLUE SHIELD
134038001	Medicaid	AR	-
C94989	Other	-	UPIN
206769218	Medicaid	MO	-
81773	Other	AR	AR BLUE SHIELD

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

Where does Jack Gregston practice?

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

What is the NPI number for Jack Gregston?

The National Provider Identifier (NPI) for Jack Gregston is 1225177447, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-04-27.