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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. DIANNE E GREGORY M.D.
NPI 1497795462
Internal Medicine in Grand Blanc, MI

Active since June 07, 2006
8235 HOLLY RD, SUITE 1, GRAND BLANC, MI 48439(810) 694-9110(810) 695-0343 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Dr. Dianne E Gregory M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DIANNE E GREGORY M.D. (NPI 1497795462) is an individual internal medicine provider in Grand Blanc, Michigan, licensed in Michigan (4301076331) and active in the NPI registry since June 2006.

NPPES Registry Identity

NPI1497795462
Entity TypeIndividualFemale
Primary Taxonomy207R00000X
Provider Legal NameDR. DIANNE E GREGORYCredential: M.D.
Location Address8235 HOLLY RD, SUITE 1Grand Blanc, MI 48439-2441
Mailing Address1085 S Linden Rd, Suite 150Flint, MI 48532-3421 · (810) 732-3240 · Fax (810) 230-0280
Phone(810) 694-9110
Fax(810) 695-0343
Sole ProprietorNo
Enumeration DateJune 7, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1497795462 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in MI · 4301076331
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
8235 HOLLY RD, Grand Blanc, MI 48439
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Other Names 1

Former Name (1)Dianne E Sonefeld

Other Providers at the Same Location NPPES 5

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ASCENSION MEDICAL GROUP-SURGICAL ASSOCIATES LLC
Surgery
8235 HOLLY RD
GRAND BLANC, MI 48439
Genesee County (810) 694-9700
ANDREA JO GOETHALS D.O.
Surgery
8235 HOLLY RD, SUITE 1
GRAND BLANC, MI 48439
Genesee County (810) 694-9700
SURGICAL ASSOCIATES, PLC
Surgery
8235 HOLLY RD, SUITE 1
GRAND BLANC, MI 48439
Genesee County (810) 694-9700
CARL G GUTEKUNST D.O.
Surgery
8235 HOLLY RD, SUITE 1
GRAND BLANC, MI 48439
Genesee County (810) 694-9700
CHILD AND ADULT MEDICINE OF GRAND BLANC
Pediatrics
8235 HOLLY RD, SUITE 1
GRAND BLANC, MI 48439
Genesee County (810) 694-9110

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Dianne Gregory's NPI number?

The NPI number for Dianne Gregory is 1497795462. It was assigned to this individual provider in the NPPES registry on June 7, 2006. The provider is also known as Dianne E Sonefeld.

Where is Dianne Gregory located?

Dianne Gregory practices at 8235 Holly Rd Suite 1, Grand Blanc, MI 48439. The listed phone number is (810) 694-9110.

What is Dianne Gregory's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

When was this NPI record last updated?

The NPPES record for Dianne Gregory was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 30 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.