Alex J. Dejong, D.O.
Family Medicine Physician · Chicago, IL
Alex J. Dejong, D.O. is a family medicine physician with a practice address in Chicago, Illinois, and NPI 1235183476, issued on May 20, 2006. Check the license (Illinois 036051143, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Alex J. Dejong
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 036051143 IL
Self-reported in NPPES; status is on the state search - Practice location
- 5841 S Maryland Ave, Chicago, IL 60637
- Phone
- (773) 834-4925
- Enumerated
- May 20, 2006
- Record last updated
- Mar 6, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (773) 834-4917
- Medicaid ID
- 036051143 IL
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 6,215 in Illinois → Look up another NPI →
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Alex J. Dejong 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 036051143Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average family medicine physician in 2024
16 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
Alex J. Dejong among 6,215 family medicine physician records in Illinois
Alex J. Dejong, D.O. is one of 6,215 family medicine physician records with a practice address in Illinois. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2017 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,593 family medicine physician records list a practice address in Chicago
They are 1,593 of the 63,379 NPPES records with a practice address in Chicago, and 6,215 family medicine physician records in Illinois.
All 6,215 in Illinois → Every provider in Chicago → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Nasreen AnsariChicago, IL 606371992886717
- Stephen BennettChicago, IL 606371013978766
- Chao Chen, M.D.Chicago, IL 606371326067075
- Richard DejongChicago, IL 606371871531103
- Amit JoshiChicago, IL 606371033163241
- Mwia Mutua, M.D.Chicago, IL 606371326434648
- Zachary Nankee, D.O.Chicago, IL 606371538514229
- Amy PannarallaChicago, IL 606371861430118
Common questions
What is Alex J. Dejong, D.O.'s NPI number?
Alex J. Dejong, D.O.'s National Provider Identifier (NPI) is 1235183476, issued on May 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Alex J. Dejong, D.O. located?
The NPPES record lists a practice address at 5841 S Maryland Ave, Chicago, IL, 60637. Phone: (773) 834-4925. Providers update this record themselves, so call before visiting.
How can I verify Alex J. Dejong, D.O.'s license?
NPPES lists Illinois license number 036051143, 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 Alex J. Dejong, D.O. prescribe under Medicare Part D?
In 2024, Alex J. Dejong, D.O. had 16 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. 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.