Bruce Gardner Karlin, MD
Internal Medicine Physician · Worcester, MA
Bruce Gardner Karlin, MD is an internal medicine physician with a practice address in Worcester, Massachusetts, and NPI 1245311166, issued on Oct 18, 2006. Check the license (Massachusetts 43792, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Bruce Gardner Karlin
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 43792 MA
Self-reported in NPPES; status is on the state search - Practice location
- 108 Grove St, Worcester, MA 01605
- Phone
- (508) 453-1005
- Enumerated
- Oct 18, 2006
- Record last updated
- Apr 16, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (508) 749-0295
- Medicaid ID
- 3085317 MA
- Medicare enrollment
- Enrolled (PECOS I20081208000074); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 1976
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 108 Grove St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Kirsten AveryCase Manager/Care Coordinator1194481564
- Colleen Callahan, M.ED., BCBA, LABABehavior Analyst1447053301
- Gina Cole, LICSWClinical Social Worker1629092556
- Stephanie Collins-RankinMental Health Counselor1609674985
- Judyth ColonClinical Social Worker1801629092
- Christina CostaSocial Worker1407626146
Verify Bruce Gardner Karlin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 43792Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% more Medicare Part D claims than the average internal medicine physician in 2024
4,219 Medicare Part D claims for 380 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 328 claims were for opioids.
Most prescribed
- Atorvastatin Calcium304 claims
- Lisinopril247 claims
- Amlodipine Besylate222 claims
- Oxycodone Hcl184 claims
- Albuterol Sulfate Hfa131 claims
- Omeprazole126 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
- Saint Vincent Physician Services IncWorcester, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Bruce Gardner Karlin among 6,825 internal medicine physician records in Massachusetts
Bruce Gardner Karlin, 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
- Graduated1976 · median 2004 among the 4,103 with a school on file
- Record last updated2018 · 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).
448 internal medicine physician records list a practice address in Worcester
They are 448 of the 13,166 NPPES records with a practice address in Worcester, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Worcester → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Maria Casal, M.D.Worcester, MA 016051609859503
- Paula Cullinane, M.D.Worcester, MA 016051952384950
- Michael Galica, M.D.Worcester, MA 016051972586733
- Maria Garcia, M.D.Worcester, MA 016051396726220
- Mary Hawthorne, M.D.Worcester, MA 016051013990787
- Gayatridevi Ika, M.D.Worcester, MA 016051124001102
- Jayanthi Kumar, M.D.Worcester, MA 016051528041423
- Christine Macginnis, D.O.Worcester, MA 016051952382772
Common questions
What is Bruce Gardner Karlin, MD's NPI number?
Bruce Gardner Karlin, MD's National Provider Identifier (NPI) is 1245311166, issued on Oct 18, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Bruce Gardner Karlin, MD located?
The NPPES record lists a practice address at 108 Grove St, Worcester, MA, 01605. Phone: (508) 453-1005. Providers update this record themselves, so call before visiting.
How can I verify Bruce Gardner Karlin, MD's license?
NPPES lists Massachusetts license number 43792, 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 Bruce Gardner Karlin, MD prescribe under Medicare Part D?
In 2024, Bruce Gardner Karlin, MD had 4,219 Medicare Part D claims for 380 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.