Nirosuthan Rajasingam, MD
Internal Medicine Physician · Chicago, IL
Nirosuthan Rajasingam, MD is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1790125474, issued on Jun 26, 2013. Check the license (Illinois 125.064095, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Nirosuthan Rajasingam
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 125.064095 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1500 S Fairfield Ave, Chicago, IL 60608
- Phone
- (773) 542-2000
- Enumerated
- Jun 26, 2013
- Record last updated
- Jul 30, 2026
- Entity
- Type 1 · individual
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Verify Nirosuthan Rajasingam 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 125.064095Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
48 Medicare Part D claims for 23 beneficiaries, against an average of 3,176 among the 108,855 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $669.63
22 payments; by number, the most common kind was food and beverage; the largest payer was Abiomed. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Nirosuthan Rajasingam among 7,238 internal medicine physician records in Illinois
Nirosuthan Rajasingam, 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 2013, is newer than 57% of them.
- NPI issued2013 · 57% of these records are older, 41% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- 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).
2,867 internal medicine physician records list a practice address in Chicago
They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →
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Common questions
What is Nirosuthan Rajasingam, MD's NPI number?
Nirosuthan Rajasingam, MD's National Provider Identifier (NPI) is 1790125474, issued on Jun 26, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Nirosuthan Rajasingam, MD located?
The NPPES record lists a practice address at 1500 S Fairfield Ave, Chicago, IL, 60608. Phone: (773) 542-2000. Providers update this record themselves, so call before visiting.
How can I verify Nirosuthan Rajasingam, MD's license?
NPPES lists Illinois license number 125.064095, 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 Nirosuthan Rajasingam, MD prescribe under Medicare Part D?
In 2024, Nirosuthan Rajasingam, MD had 48 Medicare Part D claims for 23 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Nirosuthan Rajasingam, MD's MIPS final score?
The 2023 MIPS final score is 80.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.