NPPES file of Aug 9, 2026

Sarah C. Lassey, M.D.

Maternal & Fetal Medicine Physician · Boston, MA

Sarah C. Lassey, M.D. is a maternal & fetal medicine physician with a practice address in Boston, Massachusetts, and NPI 1265878623, issued on May 13, 2013. Check the license (Massachusetts 270637, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.

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

NPPES recordNPPES file of Aug 9, 2026
1265878623
Name
Sarah C. Lassey
Credential
M.D.
Primary taxonomy
Maternal & Fetal Medicine Physician 207VM0101X
License number
270637 MA
Self-reported in NPPES; status is on the state search
Practice location
75 Francis St, Boston, MA 02115
Phone
(617) 732-5500
Enumerated
May 13, 2013
Record last updated
Jul 21, 2022
Medicare enrollment
Enrolled (PECOS I20170814002496); accepts Medicare assignment
Medical or professional school
Tufts University School Of Medicine, 2013
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 75 Francis St

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

  1. Amin AalipourStudent in an Organized Health Care Education/Training Program1902483258
  2. Emily Aaronson, M.D.Emergency Medicine Physician1962791558
  3. Sarah Abbett, M.D.Anesthesiology Physician1902097736
  4. Christine Abbott, NPAdult Health Nurse Practitioner1851471940
  5. Muhammad Abd-El-Barr, M.D., PH.D.Neurological Surgery Physician1891922688
  6. Duaa AbdelhameidStudent in an Organized Health Care Education/Training Program1851852867

Verify Sarah C. Lassey in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
    Search for license 270637    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 Massachusetts 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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Bills Medicare through one group practice

  1. Diagnostic Ultrasound Associates, PCBrookline, MA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Maternal & Fetal Medicine Physician providers in Massachusetts

There are 92 maternal & fetal medicine physician records in Massachusetts.

All 92 in Massachusetts → Every provider in Boston →

Other maternal & fetal medicine physician records in Massachusetts

  1. Jodi Abbott, MDBoston, MA1346222692
  2. Alison Asirwatham, MDWorcester, MA1447711916
  3. Achilles Athanassiou, M.D.Boston, MA1730159419
  4. Vanessa Barss, M.D.Lexington, MA1871681676
  5. William Barth, MDBoston, MA1144211715
  6. Lucy Bayer, M.D.Norwood, MA1376538355
  7. Dorothy Beazley, M.D.Boston, MA1811070279
  8. Petra Belady, M.D.Worcester, MA1467485482
  9. Carolina Bibbo, M.DBoston, MA1124253539
  10. Robert Blatman, M.D.Boston, MA1598834111

Common questions

What is Sarah C. Lassey, M.D.'s NPI number?

Sarah C. Lassey, M.D.'s National Provider Identifier (NPI) is 1265878623, issued on May 13, 2013. An NPI identifies a provider in billing; it is not a license.

Where is Sarah C. Lassey, M.D. located?

The NPPES record lists a practice address at 75 Francis St, Boston, MA, 02115. Phone: (617) 732-5500. Providers update this record themselves, so call before visiting.

How can I verify Sarah C. Lassey, M.D.'s license?

NPPES lists Massachusetts license number 270637, 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.

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.