Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Nathan Philip Seigrist, DO

Individual provider Military Health Care Provider · NPI 1780382465

Nathan Philip Seigrist, DO is a Military Health Care Provider in O Fallon, Illinois. Practices as a sole proprietor. Licensed in Florida and Illinois.

Licensed in
FL, IL
In the registry since
2023
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

3 Saint Elizabeth Blvd Ste 4000
O Fallon, IL 62269-1284
Phone: (618) 256-9355
Fax: (618) 206-2332
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

General Practice Physician (primary) Taxonomy 208D00000X · Licence OS23985 (FL)
Military Health Care Provider Taxonomy 171000000X
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X · Licence 125.084301 (IL)

Record details

NPI number1780382465
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedFebruary 21, 2023
Last updated in NPPESJune 24, 2026
Certification dateJune 24, 2026
Mailing address3 Saint Elizabeth Blvd Ste 4000, O Fallon, IL 62269-1284

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