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

Alexander Diaz Seger, MD

Individual provider Psychiatry Physician · NPI 1457913279

Alexander Diaz Seger, MD is a Psychiatry in Centralia, Illinois. Graduated from Creighton University School of Medicine in 2019, 7 years ago. Practices with Physician Services Corporation of Southern Illinois Inc, a 122-clinician group and accepts Medicare assignment. Licensed in Illinois and Nebraska.

Years since qualifying
7
Trained at
Creighton University School of Medicine
Licensed in
IL, NE
In the registry since
2019
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

400 N Pleasant Ave
Centralia, IL 62801-3056
Phone: (618) 436-8000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 036.165127 (IL)
Psychiatry Physician Taxonomy 2084P0800X · Licence 35426 (NE)

Record details

NPI number1457913279
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 1, 2019
Last updated in NPPESOctober 13, 2023
Certification dateOctober 13, 2023

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolCREIGHTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2019 (7 years in practice)
Group practice Physician Services Corporation Of Southern Illinois Inc — 122 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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