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

Dr. Marvin Den, MD

Individual provider Allergy & Immunology Physician · NPI 1659363356

Dr. Marvin Den, MD is an Allergy & Immunology Physician in Norwalk, Connecticut. Licensed in Connecticut. Registered with an NPI since 2005.

Licensed in
CT
In the registry since
2005
Specialties on file
2
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

40 Cross St 4th Fl
Norwalk, CT 06851-4647
Phone: (203) 845-4800
Fax: (203) 845-4873
Show map & directions

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

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 022759 (CT)
Allergy & Immunology Physician Taxonomy 207K00000X · Licence 022759 (CT)

Record details

NPI number1659363356
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 18, 2005
Last updated in NPPESMarch 26, 2018
Mailing address2700 Westchester Ave, Purchase, NY 10577-2547

Other providers in Norwalk