Arun Amirthalingam Kumar, MD
Internal Medicine Physician · Naperville, IL
Arun Amirthalingam Kumar, MD is an internal medicine physician with a practice address in Naperville, Illinois, and NPI 1740249259, issued on Mar 22, 2006. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Arun Amirthalingam Kumar
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 931 W 75TH St, Naperville, IL 60565
- Phone
- (630) 579-4668
- Enumerated
- Mar 22, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (630) 579-1107
- Medicare enrollment
- Enrolled (PECOS I20050909000858); 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 931 W 75TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Arun Amirthalingam Kumar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,969 Medicare Part D claims for 236 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. 20 claims were for opioids.
Most prescribed
- Atorvastatin Calcium268 claims
- Amlodipine Besylate198 claims
- Losartan Potassium151 claims
- Levothyroxine Sodium131 claims
- Metformin Hcl130 claims
- Meloxicam95 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.
Arun Amirthalingam Kumar among 7,238 internal medicine physician records in Illinois
Arun Amirthalingam Kumar, MD 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1995 · 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).
75 internal medicine physician records list a practice address in Naperville
They are 75 of the 4,634 NPPES records with a practice address in Naperville, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Naperville → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Kaihua Lai, M.D.Naperville, IL 605651689649659
- Lata Nagpal, MDNaperville, IL 605651679512263
- Rajiv Vasavada, MDNaperville, IL 605651811951197
- Iffat Ahmed, D.O.Naperville, IL 605641063668192
- Hardeep Arora, M.D.Naperville, IL 605641922057926
- Nazish Ekram, M.D.Naperville, IL 605641346496965
- Aristidis Hatzidimitriadis, MDNaperville, IL 605641508027855
- Brian O'Leary, MDNaperville, IL 605641295702439
Common questions
What is Arun Amirthalingam Kumar, MD's NPI number?
Arun Amirthalingam Kumar, MD's National Provider Identifier (NPI) is 1740249259, issued on Mar 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Arun Amirthalingam Kumar, MD located?
The NPPES record lists a practice address at 931 W 75TH St, Naperville, IL, 60565. Phone: (630) 579-4668. Providers update this record themselves, so call before visiting.
How can I verify Arun Amirthalingam Kumar, MD's license?
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 Arun Amirthalingam Kumar, MD prescribe under Medicare Part D?
In 2024, Arun Amirthalingam Kumar, MD had 2,969 Medicare Part D claims for 236 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.