Daniel Alexander Leffler, MD
Gastroenterology Physician · Boston, MA
Daniel Alexander Leffler, MD is a gastroenterology physician with a practice address in Boston, Massachusetts, and NPI 1144368697, issued on Feb 4, 2007. Check the license (Massachusetts 223242, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Daniel Alexander Leffler
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 223242 MA
Self-reported in NPPES; status is on the state search - Practice location
- 330 Brookline Ave, Boston, MA 02215
- Phone
- (617) 667-2136
- Enumerated
- Feb 4, 2007
- Record last updated
- Apr 13, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20050503000823); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 686 in Massachusetts → Look up another NPI →
Also registered at 330 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Daniel Alexander Leffler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 223242Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average gastroenterology physician in 2024
57 Medicare Part D claims for 15 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.
Most prescribed
- Pantoprazole Sodium18 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
- Harvard Medical Faculty Phys AT Beth Israel Deaconess Med Ctr IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel Alexander Leffler among 686 gastroenterology physician records in Massachusetts
Daniel Alexander Leffler, MD is one of 686 gastroenterology physician records with a practice address in Massachusetts. 80% 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 51% of them.
- NPI issued2007 · 51% of these records are older, 40% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2002 · median 2004 among the 491 with a school on file
- Record last updated2011 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Massachusetts
There are 686 gastroenterology physician records in Massachusetts.
All 686 in Massachusetts → Every provider in Boston → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Michael Apstein, MDBoston, MA 022151609854603
- Alphonso Brown, MDBoston, MA 022151871579987
- Valerie Byrnes, M.D.Boston, MA 022151467410332
- Catherine Cheney, M.D.Boston, MA 022151710962030
- Zalman Falchuk, MDBoston, MA 022151912996000
- Kenneth Falchuk, M.D.Boston, MA 022151639154305
- Douglas Horst, MDBoston, MA 022151518957224
- John Lamont, MDBoston, MA 022151316903735
Common questions
What is Daniel Alexander Leffler, MD's NPI number?
Daniel Alexander Leffler, MD's National Provider Identifier (NPI) is 1144368697, issued on Feb 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Daniel Alexander Leffler, MD located?
The NPPES record lists a practice address at 330 Brookline Ave, Boston, MA, 02215. Phone: (617) 667-2136. Providers update this record themselves, so call before visiting.
How can I verify Daniel Alexander Leffler, MD's license?
NPPES lists Massachusetts license number 223242, 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 Daniel Alexander Leffler, MD prescribe under Medicare Part D?
In 2024, Daniel Alexander Leffler, MD had 57 Medicare Part D claims for 15 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.