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

Dr. Fred William Marcus, DO

Individual provider Addiction Medicine (Family Medicine) Physician · NPI 1710123963

Dr. Fred William Marcus, DO is an Addiction Medicine (Family Medicine) Physician in Syosset, New York. Practices as a sole proprietor. Licensed in New York.

Licensed in
NY
In the registry since
2008
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

770 Jericho Tpke
Syosset, NY 11791-4516
Phone: (516) 496-2049
Fax: (516) 496-2049
Show map & directions

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

Specialties & licences

Addiction Medicine (Family Medicine) Physician (primary) Taxonomy 207QA0401X · Licence 132700 (NY)

Record details

NPI number1710123963
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedDecember 17, 2008
Last updated in NPPESDecember 17, 2008