NPPES file of Aug 9, 2026

Marshall Nathan Lassman, MD

Endocrinology, Diabetes & Metabolism Physician · Hartford, CT

Marshall Nathan Lassman, MD is an endocrinology, diabetes & metabolism physician with a practice address in Hartford, Connecticut, and NPI 1629040357, issued on Feb 6, 2006. Check the license (Connecticut 0015106, as entered in NPPES) on the Connecticut Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1629040357
Name
Marshall Nathan Lassman
Credential
MD
Primary taxonomy
Endocrinology, Diabetes & Metabolism Physician 207RE0101X
License numbers
0015106 CT
015106 CT
Self-reported in NPPES; status is on the state search
Practice location
1000 Asylum Ave, Hartford, CT 06105
Phone
(860) 247-2137
Enumerated
Feb 6, 2006
Record last updated
Mar 7, 2023
Fax
(860) 728-0480
Medicaid ID
001151067 CT
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest endocrinology, diabetes & metabolism physician records → All 214 in Connecticut → Look up another NPI →

Also registered at 1000 Asylum Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Syed Alam, M.D.Hospice and Palliative Medicine (Internal Medicine) Physician1174058028
  2. Rachel AltamiranoStudent in an Organized Health Care Education/Training Program1124962485
  3. Sharareh Amin Hanjani, APRNNurse Practitioner1831452523
  4. Swapnil Bagade, MDDiagnostic Radiology Physician1801100367
  5. Kristofer Bagdasarian, M.D.Surgery Physician1588848774
  6. Erik Bee, MDDiagnostic Radiology Physician1588807002

Verify Marshall Nathan Lassman in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersConnecticut Medical Examining Board
    Search for license 0015106    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Connecticut license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Marshall Nathan Lassman among 214 endocrinology, diabetes & metabolism physician records in Connecticut

Marshall Nathan Lassman, MD is one of 214 endocrinology, diabetes & metabolism physician records with a practice address in Connecticut. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 13% of them.

  • NPI issued2006 · 13% of these records are older, 55% newer
  • In a Medicare fileNo · 83% of these records are
  • In the CMS Doctors and Clinicians fileNo · 68% of these records are
  • Record last updated2023 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Endocrinology, Diabetes & Metabolism Physician providers in Connecticut

There are 214 endocrinology, diabetes & metabolism physician records in Connecticut. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 214 in Connecticut → Every provider in Hartford → Endocrinology, Diabetes & Metabolism Physician nationwide →

The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes

  1. Kareen Champagne, MDHartford, CT 061051255828372
  2. Emmanuel Javier, MDHartford, CT 061051740283779
  3. Ibitoro Osakwe, MDHartford, CT 061051245338474
  4. Kamal Shoukri, MDHartford, CT 061051649277013
  5. Paul Sullivan, MDWest Hartford, CT 061051952754400
  6. Socorro Vargas, MDHartford, CT 061051588774244
  7. Ipek Alpertunga, MDHartford, CT 061061386166452
  8. Racha Dermesropian, MDHartford, CT 061061043484264

Common questions

What is Marshall Nathan Lassman, MD's NPI number?

Marshall Nathan Lassman, MD's National Provider Identifier (NPI) is 1629040357, issued on Feb 6, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Marshall Nathan Lassman, MD located?

The NPPES record lists a practice address at 1000 Asylum Ave, Hartford, CT, 06105. Phone: (860) 247-2137. Providers update this record themselves, so call before visiting.

How can I verify Marshall Nathan Lassman, MD's license?

NPPES lists Connecticut license number 0015106, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.