Gerald I. Kassels, M.D.
Internal Medicine Physician · Boston, MA
Gerald I. Kassels, M.D. is an internal medicine physician with a practice address in Boston, Massachusetts, and NPI 1093797599, issued on Nov 18, 2005. Check the license (Massachusetts 36953, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Gerald I. Kassels
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 36953 MA
Self-reported in NPPES; status is on the state search - Practice location
- 125 Nashua St, Boston, MA 02114
- Phone
- (616) 573-7110
- Enumerated
- Nov 18, 2005
- Record last updated
- Jul 13, 2026
- Medicaid ID
- 2049732 MA
- Medicare enrollment
- Enrolled (PECOS I20041216000498); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1973
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 125 Nashua St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Randie Black-Schaffer, MDPhysical Medicine & Rehabilitation Physician1225010515
- Meghan Caldwell, LICSWClinical Social Worker1437527488
Verify Gerald I. Kassels in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 36953Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Massachusetts General Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gerald I. Kassels among 6,825 internal medicine physician records in Massachusetts
Gerald I. Kassels, 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 88% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1973 · median 2004 among the 4,103 with a school on file
- Record last updated2026 · 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).
2,320 internal medicine physician records list a practice address in Boston
They are 2,320 of the 41,865 NPPES records with a practice address in Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- James Evans, MDBoston, MA 021141215939533
- Nicolette Fontaine, MDBoston, MA 021141841287174
- Nancy Gagliano, MDBoston, MA 021141881680767
- Patricia Gibbons, MDBoston, MA 021141619967221
- Steven Hersch, MDBoston, MA 021141174512149
- Mira Kautzky, M.D.Boston, MA 021141972505402
Common questions
What is Gerald I. Kassels, M.D.'s NPI number?
Gerald I. Kassels, M.D.'s National Provider Identifier (NPI) is 1093797599, issued on Nov 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Gerald I. Kassels, M.D. located?
The NPPES record lists a practice address at 125 Nashua St, Boston, MA, 02114. Phone: (616) 573-7110. Providers update this record themselves, so call before visiting.
How can I verify Gerald I. Kassels, M.D.'s license?
NPPES lists Massachusetts license number 36953, 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.
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.