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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. GREGORY AARON RACZNIAK M.D., PH.D., M.PHIL
NPI 1861460636
Preventive Medicine - Occupational Medicine in Honolulu, HI

Active since March 09, 2006
820 MILILANI ST STE 745, HONOLULU, HI 96813(808) 481-6678 Get Directions Write a Review

NPPES record last updated: September 4, 2026. Verified against the NPPES registry weekly; last sync: September 13, 2026.

Record update history: Sep 4, 2026, Aug 20, 2021 (2 updates tracked since 2021).

About Dr. Gregory Aaron Raczniak M.d., Ph.d., M.phil NPPES

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

DR. GREGORY AARON RACZNIAK M.D., PH.D., M.PHIL (NPI 1861460636) is an individual occupational medicine provider in Honolulu, Hawaii, licensed in Hawaii (MD22330) and active in the NPI registry since March 2006. He maintains 2 additional practice locations.

NPPES Registry Identity

NPI1861460636
Entity TypeIndividualMale
Primary Taxonomy2083X0100X
Provider Legal NameDR. GREGORY AARON RACZNIAKCredential: M.D., PH.D., M.PHIL
Location Address820 MILILANI ST STE 745Honolulu, HI 96813-2986
Mailing Address820 Mililani St Ste 745Honolulu, HI 96813-2986 · (808) 481-6678
Phone(808) 481-6678
Sole ProprietorYes
Enumeration DateMarch 9, 2006
Last NPPES UpdateSeptember 4, 20262 updates tracked since enumeration
NPPES CertifiedSeptember 4, 2026
✔ NPI 1861460636 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPreventive Medicine · Occupational MedicineAllopathic & Osteopathic Physicians
Taxonomy Code2083X0100X
License✔ Licensed in HI · MD22330
Definition
Occupational medicine focuses on the health of workers, including the ability to perform work; the physical, chemical, biological, and social environments of the workplace; and the health outcomes of environmental exposures. Practitioners in this field address the promotion of health in the work place, and the prevention and management of occupational and environmental injury, illness, and disability.
Also ListedPreventive Medicine · Public Health & General Preventive MedicineTaxonomy 2083P0901X · License MD-22330 (HI)
820 MILILANI ST STE 745, Honolulu, HI 96813
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Secondary Practice Locations 2

Location 11003 Bishop St Ste 820Honolulu, HI 96813-6421 · Phone (808) 481-6678
Location 21 Coral Sea StKapolei, HI 96707-3693 · Phone (808) 682-2673 · Fax (808) 682-2779

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

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 Gregory Raczniak's NPI number?

The NPI number for Gregory Raczniak is 1861460636. It was assigned to this individual provider in the NPPES registry on March 9, 2006.

Where is Gregory Raczniak located?

Gregory Raczniak practices at 820 Mililani St Ste 745, Honolulu, HI 96813. The listed phone number is (808) 481-6678.

What is Gregory Raczniak's specialty?

The primary specialty registered for this NPI is Preventive Medicine, specializing in Occupational Medicine, with taxonomy code 2083X0100X.

When was this NPI record last updated?

The NPPES record for Gregory Raczniak was last updated on September 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.