Alexander Diaz Seger, MD
Psychiatry Physician · Centralia, IL
Alexander Diaz Seger, MD is a psychiatry physician with a practice address in Centralia, Illinois, and NPI 1457913279, issued on Jul 1, 2019. Check the license (Illinois 036.165127, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Alexander Diaz Seger
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License numbers
- 036.165127 IL
35426 NE
Self-reported in NPPES; status is on the state search - Practice location
- 400 N Pleasant Ave, Centralia, IL 62801
- Phone
- (618) 436-8000
- Enumerated
- Jul 1, 2019
- Record last updated
- Oct 13, 2023
- Medicare enrollment
- Enrolled (PECOS I20230720002871); accepts Medicare assignment
- Medical or professional school
- Creighton University School Of Medicine, 2019
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,147 in Illinois → Look up another NPI →
Also registered at 400 N Pleasant Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Alexander Diaz Seger in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.165127Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average psychiatry physician in 2024
261 Medicare Part D claims for 39 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Trazodone Hcl19 claims
- Hydroxyzine Hcl12 claims
- Olanzapine11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Physician Services Corporation OF Southern Illinois IncCentralia, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander Diaz Seger among 2,147 psychiatry physician records in Illinois
Alexander Diaz Seger, MD is one of 2,147 psychiatry physician records with a practice address in Illinois. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 78% of them.
- NPI issued2019 · 78% of these records are older, 19% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 41% of these records are
- Graduated2019 · median 2004 among the 877 with a school on file
- Record last updated2023 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Illinois
There are 2,147 psychiatry physician records in Illinois.
All 2,147 in Illinois → Every provider in Centralia → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Robert Norman, MDCentralia, IL 628011558579755
- Uaiye Enosolease, MDSpringfield, IL 627811255179081
- Sibtain Kazmi, MDSpringfield, IL 627811649018748
- Sydney Nyquist, MDSpringfield, IL 627811073409702
- Jesutomilola Olayemi, MDSpringfield, IL 627811619712361
- Hunter Roller, MDSpringfield, IL 627811144063504
- Richard Parks, M.D.Du Quoin, IL 628321629057435
- Anand Subramanian, DODu Quoin, IL 628321316467632
Common questions
What is Alexander Diaz Seger, MD's NPI number?
Alexander Diaz Seger, MD's National Provider Identifier (NPI) is 1457913279, issued on Jul 1, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Diaz Seger, MD located?
The NPPES record lists a practice address at 400 N Pleasant Ave, Centralia, IL, 62801. Phone: (618) 436-8000. Providers update this record themselves, so call before visiting.
How can I verify Alexander Diaz Seger, MD's license?
NPPES lists Illinois license number 036.165127, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexander Diaz Seger, MD prescribe under Medicare Part D?
In 2024, Alexander Diaz Seger, MD had 261 Medicare Part D claims for 39 beneficiaries; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.