Subramony Subramonia Iyer, M.D.
Internal Medicine Physician · Springfield, MA
Subramony Subramonia Iyer, M.D. is an internal medicine physician with a practice address in Springfield, Massachusetts, and NPI 1558551952, issued on Jul 31, 2007. Check the license (Massachusetts 253528, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Subramony Subramonia Iyer
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 253528 MA
Self-reported in NPPES; status is on the state search - Practice location
- 271 Carew Street, Springfield, MA 01104
- Phone
- (413) 794-8120
- Enumerated
- Jul 31, 2007
- Record last updated
- Apr 10, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (413) 794-1767
- Medicare enrollment
- Enrolled (PECOS I20130702000507); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 271 Carew Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Subramony Subramonia Iyer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 253528Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,126 Medicare Part D claims for 386 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 615 claims were for opioids.
Most prescribed
- Oxycodone Hcl244 claims
- Lorazepam126 claims
- Ondansetron Odt118 claims
- Morphine Sulfate Er105 claims
- Prednisone102 claims
- Oxycodone-Acetaminophen93 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.
Industry payments in 2024: $129.21
1 payment: food and beverage; the largest payer was Tempus AI, Inc. 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.
Bills Medicare through one group practice
- Mercy Medical Group IncSpringfield, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Subramony Subramonia Iyer among 6,825 internal medicine physician records in Massachusetts
Subramony Subramonia Iyer, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1994 · median 2004 among the 4,103 with a school on file
- Record last updated2014 · 64% 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 Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
282 internal medicine physician records list a practice address in Springfield
They are 282 of the 8,553 NPPES records with a practice address in Springfield, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Springfield → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Simon Ahtaridis, M.D.Springfield, MA 011041053383901
- Muhammad Awaisi, M.D.Springfield, MA 011041326012071
- William Belcastro, M.D.Springfield, MA 011041548269251
- James Haines, M.D.Springfield, MA 011041497754170
- Anand Kanjolia, MDSpringfield, MA 011041861465593
- Bruce Lockhart, M.D.Springfield, MA 011041255375630
- Bipinchandra Mistry, MDSpringfield, MA 011041083670541
- Mark Mullan, MDSpringfield, MA 011041700862638
Common questions
What is Subramony Subramonia Iyer, M.D.'s NPI number?
Subramony Subramonia Iyer, M.D.'s National Provider Identifier (NPI) is 1558551952, issued on Jul 31, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Subramony Subramonia Iyer, M.D. located?
The NPPES record lists a practice address at 271 Carew Street, Springfield, MA, 01104. Phone: (413) 794-8120. Providers update this record themselves, so call before visiting.
How can I verify Subramony Subramonia Iyer, M.D.'s license?
NPPES lists Massachusetts license number 253528, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Subramony Subramonia Iyer, M.D. prescribe under Medicare Part D?
In 2024, Subramony Subramonia Iyer, M.D. had 3,126 Medicare Part D claims for 386 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.