Gary R. Fleisher, MD
Emergency Medicine Physician · Boston, MA
Gary R. Fleisher, MD is an emergency medicine physician with a practice address in Boston, Massachusetts, and NPI 1952369696, issued on May 3, 2006. Check the license (Massachusetts 55922, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Gary R. Fleisher
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 55922 MA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Longwood Ave, Boston, MA 02115
- Phone
- (617) 355-5022
- Enumerated
- May 3, 2006
- Record last updated
- Aug 17, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (617) 730-0469
- Medicaid ID
- 3005980 MA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,829 in Massachusetts → Look up another NPI →
Also registered at 300 Longwood Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gary R. Fleisher in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 55922Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $33.03
1 payment: food and beverage; the largest payer was Boston Scientific Corporation. The 12,335 providers of this specialty with any payment received $953.79 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Gary R. Fleisher among 1,829 emergency medicine physician records in Massachusetts
Gary R. Fleisher, MD is one of 1,829 emergency medicine physician records with a practice address in Massachusetts. 82% 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 9% of them.
- NPI issued2006 · 9% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2007 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
543 emergency medicine physician records list a practice address in Boston
They are 543 of the 41,865 NPPES records with a practice address in Boston, and 1,829 emergency medicine physician records in Massachusetts.
All 1,829 in Massachusetts → Every provider in Boston → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- J Stephen Bohan, MD MSBoston, MA 021151376509034
- Calvin Brown, MDBoston, MA 021151235129461
- Jennifer Chan, MD, MPHBoston, MA 021151750372785
- John Collins, MDBoston, MA 021151912976242
- Susan Farrell, MDBoston, MA 021151922064146
- Tania Fatovich, MDBoston, MA 021151407812688
- Paul Greenough, M.D.Boston, MA 021151902861180
- Stephanie Kayden, MD, MPHBoston, MA 021151629034954
Common questions
What is Gary R. Fleisher, MD's NPI number?
Gary R. Fleisher, MD's National Provider Identifier (NPI) is 1952369696, issued on May 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary R. Fleisher, MD located?
The NPPES record lists a practice address at 300 Longwood Ave, Boston, MA, 02115. Phone: (617) 355-5022. Providers update this record themselves, so call before visiting.
How can I verify Gary R. Fleisher, MD's license?
NPPES lists Massachusetts license number 55922, 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.