Ashok Natarajan
Internal Medicine Physician · Oak Lawn, IL
Ashok Natarajan is an internal medicine physician with a practice address in Oak Lawn, Illinois, and NPI 1194279281, issued on Aug 7, 2016. Check the license (Illinois 036178868, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ashok Natarajan
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036178868 IL
Self-reported in NPPES; status is on the state search - Practice location
- 4440 W 95TH St Ste 1128M, Oak Lawn, IL 60453
- Phone
- (312) 609-0300
- Enumerated
- Aug 7, 2016
- Record last updated
- Jun 26, 2026
- Medicare enrollment
- Enrolled (PECOS I20200915000344); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 4440 W 95TH St Ste 1128M
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Anas Albrejawi AlhomsiHospitalist Physician1033590690
- Annu Eranki, MDInternal Medicine Physician1497107338
- Mirela Galatanu, MDAdult Medicine Physician1568497691
- Sohaib Hameed, DOHospitalist Physician1023698644
- Lucy Ho, MDInternal Medicine Physician1700807401
- Andrew Incandela, MDHospitalist Physician1053051938
Verify Ashok Natarajan 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 036178868Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
79% fewer Medicare Part D claims than the average internal medicine physician in 2024
664 Medicare Part D claims for 157 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 22 claims were for opioids.
Most prescribed
- Atorvastatin Calcium59 claims
- Metoprolol Succinate40 claims
- Pantoprazole Sodium35 claims
- Amlodipine Besylate33 claims
- Eliquis29 claims
- Clopidogrel27 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
- Eastern Maine Medical CenterBangor, ME
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ashok Natarajan among 7,238 internal medicine physician records in Illinois
Ashok Natarajan 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 2016, is newer than 63% of them.
- NPI issued2016 · 63% of these records are older, 36% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated2016 · 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).
173 internal medicine physician records list a practice address in Oak Lawn
They are 173 of the 2,993 NPPES records with a practice address in Oak Lawn, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Oak Lawn → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Robert Chalupczak, M.D.Oak Lawn, IL 604531679505051
- Anupam Goel, MDOak Lawn, IL 604531013957570
- Joseph Kowalczyk, MDOak Lawn, IL 604531831166255
- Vinay Kumar, MDOak Lawn, IL 604531639138217
- Eugene Muzykansky, MDOak Lawn, IL 604531457328874
- Win Myint, MDOak Lawn, IL 604531063412062
- Robert Raines, MDOak Lawn, IL 604531164499596
- Mark Reiter, M.D.Oak Lawn, IL 604531902864408
Common questions
What is Ashok Natarajan's NPI number?
Ashok Natarajan's National Provider Identifier (NPI) is 1194279281, issued on Aug 7, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Ashok Natarajan located?
The NPPES record lists a practice address at 4440 W 95TH St Ste 1128M, Oak Lawn, IL, 60453. Phone: (312) 609-0300. Providers update this record themselves, so call before visiting.
How can I verify Ashok Natarajan's license?
NPPES lists Illinois license number 036178868, 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 Ashok Natarajan prescribe under Medicare Part D?
In 2024, Ashok Natarajan had 664 Medicare Part D claims for 157 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.