Thomas Isaac, MD
Internal Medicine Physician · Braintree, MA
Thomas Isaac, MD is an internal medicine physician with a practice address in Braintree, Massachusetts, and NPI 1811939374, issued on Jun 11, 2006. Check the license (Massachusetts 223676, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Thomas Isaac
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 223676 MA
Self-reported in NPPES; status is on the state search - Practice location
- 111 Grossman Dr, Braintree, MA 02184
- Phone
- (781) 849-2405
- Enumerated
- Jun 11, 2006
- Record last updated
- Mar 7, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (781) 849-2238
- Medicare enrollment
- Enrolled (PECOS I20080925000398); 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 111 Grossman Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Deborah Antos, PAMedical Physician Assistant1295798437
- Peter Barrant, M.D.Pediatrics Physician1215913835
- Caitlin Bast, DNPAdult Health Nurse Practitioner1558945071
- Gail Bean, NPNurse Practitioner1992774137
- Vicki Beggs, PHDPsychologist1104877539
- Elvira Belenky, PAMedical Physician Assistant1316901507
Verify Thomas Isaac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 223676Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,046 Medicare Part D claims for 148 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 23 claims were for opioids.
Most prescribed
- Atorvastatin Calcium101 claims
- Rosuvastatin Calcium90 claims
- Amlodipine Besylate88 claims
- Metformin Hcl Er53 claims
- Hydrochlorothiazide51 claims
- Lisinopril44 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 one group practice
- Atrius Health IncNeedham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas Isaac among 6,825 internal medicine physician records in Massachusetts
Thomas Isaac, MD 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2001 · median 2004 among the 4,103 with a school on file
- Record last updated2021 · 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).
32 internal medicine physician records list a practice address in Braintree
They are 32 of the 991 NPPES records with a practice address in Braintree, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Braintree → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Renee Aversano, MDBraintree, MA 021841962402255
- Richard Black, MDBraintree, MA 021841669473955
- Arthur Bregoli, M.D.Braintree, MA 021841801863196
- Mohamed Elgeziry, MDBraintree, MA 021841477512929
- George Holmes, M.D.Braintree, MA 021841518935642
- Hikaru Isihara, M.D., PH.D.Braintree, MA 021841598750598
- Sara Kelly, M.D.Braintree, MA 021841164491957
- Louis Maggio, M.DBraintree, MA 021841518929637
Common questions
What is Thomas Isaac, MD's NPI number?
Thomas Isaac, MD's National Provider Identifier (NPI) is 1811939374, issued on Jun 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas Isaac, MD located?
The NPPES record lists a practice address at 111 Grossman Dr, Braintree, MA, 02184. Phone: (781) 849-2405. Providers update this record themselves, so call before visiting.
How can I verify Thomas Isaac, MD's license?
NPPES lists Massachusetts license number 223676, 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 Thomas Isaac, MD prescribe under Medicare Part D?
In 2024, Thomas Isaac, MD had 1,046 Medicare Part D claims for 148 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.