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
Mailing address770 Jericho Tpke, Syosset, NY 11791-4516