Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. John I. Loewenstein, MD

Individual provider Ophthalmology Physician · NPI 1912997099

Dr. John I. Loewenstein, MD is an Ophthalmology Physician in Boston, Massachusetts. Licensed in Massachusetts. Registered with an NPI since 2005.

Licensed in
MA
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

243 Charles St
Boston, MA 02114-3002
Phone: (617) 573-4458
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Ophthalmology Physician (primary) Taxonomy 207W00000X · Licence 37447 (MA)

Record details

NPI number1912997099
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 28, 2005
Last updated in NPPESAugust 22, 2013

Other providers in Boston