John B. Constantine, M.D.
Ophthalmology Physician · Chelmsford, MA
John B. Constantine, M.D. is an ophthalmology physician with a practice address in Chelmsford, Massachusetts, and NPI 1437157765, issued on Jul 11, 2005. Check the license (Massachusetts 71751, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John B. Constantine
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 71751 MA
Self-reported in NPPES; status is on the state search - Practice location
- 19 Village SQ, Chelmsford, MA 01824
- Phone
- (978) 256-5600
- Enumerated
- Jul 11, 2005
- Record last updated
- Sep 29, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (978) 703-0250
- Medicaid ID
- 2024535 MA
- Entity
- Type 1 · individual
Also registered at 19 Village SQ
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Glen Bolliger, MDOphthalmology Physician1568455897
- Bruce Bunker, O.D.Optometrist1750386835
- Jennifer Calnan, ODPediatric Optometrist1508076027
- Melissa Donald, O.D.Optometrist1750674958
- Hannah Donovan, ODOptometrist1750066320
- Cecily Hamill, MD, PHDOphthalmology Physician1265676928
Verify John B. Constantine in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 71751Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10 ophthalmology physician records list a practice address in Chelmsford
They are 10 of the 937 NPPES records with a practice address in Chelmsford, and 791 ophthalmology physician records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 10 in Chelmsford → All 791 in Massachusetts → Every provider in Chelmsford →
Other ophthalmology physician records in Massachusetts
- Mark Abelson, M.D.Andover, MA1811990682
- Inas Aboobakar, M.D.Boston, MA1760846265
- Omar Abuqamar, M.D., M.M.S.C.,Burlington, MA1437640414
- Alessandro Adad Jammal, MD, PHDBoston, MA1518725480
- David Agahigian, M.D.Springfield, MA1205822293
- Kanika Agarwal, MDBoston, MA1245692433
- Muna Ahmad, M.D.Leominster, MA1588830145
- Lloyd Aiello, M.D., PH.D.Boston, MA1588622104
- Motasem Al-Latayfeh, M.D.Boston, MA1184855710
- Pierre Alfred, MDAthol, MA1912998501
Common questions
What is John B. Constantine, M.D.'s NPI number?
John B. Constantine, M.D.'s National Provider Identifier (NPI) is 1437157765, issued on Jul 11, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John B. Constantine, M.D. located?
The NPPES record lists a practice address at 19 Village SQ, Chelmsford, MA, 01824. Phone: (978) 256-5600. Providers update this record themselves, so call before visiting.
How can I verify John B. Constantine, M.D.'s license?
NPPES lists Massachusetts license number 71751, 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. 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.