Zainulabuddin Syed, M.D.
Internal Medicine Physician · Downers Grove, IL
Zainulabuddin Syed, M.D. is an internal medicine physician with a practice address in Downers Grove, Illinois, and NPI 1609876424, issued on Jul 22, 2005. Check the license (Illinois 036091132, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Zainulabuddin Syed
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036091132 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4121 Fairview Ave Ste L1, Downers Grove, IL 60515
- Phone
- (630) 968-4790
- Enumerated
- Jul 22, 2005
- Record last updated
- Mar 2, 2026
- Fax
- (630) 968-8755
- Medicare enrollment
- Enrolled (PECOS I20101129000142); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 4121 Fairview Ave Ste L1
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ataullah Arain, MDFamily Medicine Physician1891873048
- Sarah Syed, RDMSSonography Radiologic Technologist1205649977
Verify Zainulabuddin Syed 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 036091132Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,055 Medicare Part D claims for 230 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 45 claims were for opioids.
Most prescribed
- Atorvastatin Calcium219 claims
- Levothyroxine Sodium171 claims
- Metformin Hcl153 claims
- Amlodipine Besylate119 claims
- Simvastatin105 claims
- Lisinopril89 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.
Zainulabuddin Syed among 7,238 internal medicine physician records in Illinois
Zainulabuddin Syed, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 93% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1973 · median 2003 among the 3,580 with a school on file
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
33 internal medicine physician records list a practice address in Downers Grove
They are 33 of the 1,899 NPPES records with a practice address in Downers Grove, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Downers Grove → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Susan Badri, M.D.Downers Grove, IL 605151912985722
- Gigi Ip, MDDowners Grove, IL 605151376519777
- Robert King, MDDowners Grove, IL 605151104892041
- David Labotka, MDDowners Grove, IL 605151205803178
- Barbara Loeb, MDDowners Grove, IL 605151619976396
- Monica Martin, MDDowners Grove, IL 605151881693315
- Richard McPartlin, MDDowners Grove, IL 605151700853140
- Maziyar Mirhosseini, M.D.Downers Grove, IL 605151508870809
Common questions
What is Zainulabuddin Syed, M.D.'s NPI number?
Zainulabuddin Syed, M.D.'s National Provider Identifier (NPI) is 1609876424, issued on Jul 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Zainulabuddin Syed, M.D. located?
The NPPES record lists a practice address at 4121 Fairview Ave Ste L1, Downers Grove, IL, 60515. Phone: (630) 968-4790. Providers update this record themselves, so call before visiting.
How can I verify Zainulabuddin Syed, M.D.'s license?
NPPES lists Illinois license number 036091132, 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 Zainulabuddin Syed, M.D. prescribe under Medicare Part D?
In 2024, Zainulabuddin Syed, M.D. had 3,055 Medicare Part D claims for 230 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.