NPPES file of Aug 9, 2026

Erin J. Leahy, M.D.

Geriatric Medicine (Internal Medicine) Physician · Springfield, MA

Erin J. Leahy, M.D. is a geriatric medicine (internal medicine) physician with a practice address in Springfield, Massachusetts, and NPI 1235339607, issued on Jul 23, 2007. Check the license (Massachusetts 243564, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1235339607
Name
Erin J. Leahy
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License numbers
243564 MA
52576 WI
Self-reported in NPPES; status is on the state search
Practice location
759 Chestnut St, Springfield, MA 01107
Phone
(413) 794-8121
Enumerated
Jul 23, 2007
Record last updated
Jun 8, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20210401001729); accepts Medicare assignment
Medical or professional school
Medical College Of Wisconsin, 2007
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (internal medicine) physician records → All 225 in Massachusetts → Look up another NPI →

Also registered at 759 Chestnut St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Omar Abduljabar, M.D.Family Medicine Physician1770978843
  2. Alfred Adegboyegun, MDThoracic Surgery (Cardiothoracic Vascular Surgery) Physician1205953957
  3. Alueshima Akough-Weir, M.DInternal Medicine Physician1306154109
  4. Vanna Albert, MDEmergency Medicine Physician1548680952
  5. Mehak Ali, MDInternal Medicine Physician1003222431
  6. Shaheen Alvi, MDInternal Medicine Physician1972953107

Verify Erin J. Leahy in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 243564    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Massachusetts license search

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87% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

557 Medicare Part D claims for 96 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D.

  1. Erin Leahy557
  2. Specialty average4,246

Most prescribed

  1. Donepezil Hcl199 claims
  2. Memantine Hcl195 claims
  3. Sertraline Hcl69 claims
  4. Aripiprazole28 claims
  5. Mirtazapine19 claims
  6. Escitalopram Oxalate11 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 4 group practices

  1. Care Neurodegenerative Medical OF New York PCMilwaukee, WI
  2. Carend Provider Group OF Kansas PAMilwaukee, WI
  3. Carend Provider Group OF New Jersey PCMilwaukee, WI
  4. Carend Provider Group PAMilwaukee, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Erin J. Leahy among 225 geriatric medicine (internal medicine) physician records in Massachusetts

Erin J. Leahy, M.D. is one of 225 geriatric medicine (internal medicine) physician records with a practice address in Massachusetts. 71% 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 56% of them.

  • NPI issued2007 · 56% of these records are older, 36% newer
  • In a Medicare fileYes · 71% of these records are
  • In the CMS Doctors and Clinicians fileYes · 53% of these records are
  • Graduated2007 · median 2000 among the 119 with a school on file
  • Record last updated2021 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Geriatric Medicine (Internal Medicine) Physician providers in Massachusetts

There are 225 geriatric medicine (internal medicine) physician records in Massachusetts.

All 225 in Massachusetts → Every provider in Springfield → Geriatric Medicine (Internal Medicine) Physician nationwide →

The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes

  1. Ujjwala Seetha Bhagavatula, M.D.Springfield, MA 011071336592369
  2. Maura Brennan, MDSpringfield, MA 011071962595421
  3. Alison Grover, MD, MPHSpringfield, MA 011071326174574
  4. Victoria Nguyen, DOSpringfield, MA 011071518533785
  5. Yael Tarshish, MDSpringfield, MA 011071285163923
  6. Deepu Thomas, MDSpringfield, MA 011071932376803
  7. Lubna Attal, MDLongmeadow, MA 011061073132346
  8. Stephen Bonasera, MDLongmeadow, MA 011061780632729

Common questions

What is Erin J. Leahy, M.D.'s NPI number?

Erin J. Leahy, M.D.'s National Provider Identifier (NPI) is 1235339607, issued on Jul 23, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Erin J. Leahy, M.D. located?

The NPPES record lists a practice address at 759 Chestnut St, Springfield, MA, 01107. Phone: (413) 794-8121. Providers update this record themselves, so call before visiting.

How can I verify Erin J. Leahy, M.D.'s license?

NPPES lists Massachusetts license number 243564, 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 Erin J. Leahy, M.D. prescribe under Medicare Part D?

In 2024, Erin J. Leahy, M.D. had 557 Medicare Part D claims for 96 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.