Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Gregory A. Gregg, M.D.

Diagnostic Radiology Physician in Springfield, IL · enumerated 2006.

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

National Provider Identifier

1568575595

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Registry record

Entity type Individual (Type 1)

Name Dr. Gregory A. Gregg

Credential M.D.

Sex Male

Practice address 800 E Carpenter St, Department of Radiology, Springfield, IL, 62702

Phone (217) 544-6464

Fax (217) 525-5671

Enumeration date Aug 16, 2006

Last updated in NPPES Jan 11, 2024

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 036064294 (IL) 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
300026227	Other	IL	RR MEDICARE
P00028349	Other	IL	RR MEDICARE
36064294	Medicaid	IL	-

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

Is NPI 1568575595 active?

Yes, as of the latest NPPES snapshot, NPI 1568575595 is active (record last updated 2024-01-11).

How do I verify Gregory Gregg's NPI record?

Cross-check NPI 1568575595 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-01-11.