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

Mark Matthew Sieg I, CAP, LCSW

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1548831522

Mark Matthew Sieg I, CAP, LCSW is an Addiction (Substance Use Disorder) Counselor in Gulfport, Florida. Licensed in Florida. Registered with an NPI since 2021.

Licensed in
FL
In the registry since
2021
Specialties on file
2
What do these letters mean?
LCSW — Licensed Clinical Social Worker
A social worker licensed to diagnose and treat mental health conditions independently.

See every abbreviation used in this directory →

Practice location Address checks out

5826 27th Ave S
Gulfport, FL 33707-5221
Phone: (727) 301-0016
Show map & directions

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

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence SW16209 (FL)
Addiction (Substance Use Disorder) Counselor Taxonomy 101YA0400X · Licence 2544 (FL)

Record details

NPI number1548831522
Entity typeIndividual (Type 1)
GenderMale
Credentials CAP , LCSW
Sole proprietorNo
NPI enumeratedJuly 9, 2021
Last updated in NPPESJuly 9, 2021
Certification dateJuly 9, 2021

Other providers in Gulfport