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

Dr. Mark Clay Williams, PHD

Individual provider Clinical Psychologist · NPI 1619998416

Dr. Mark Clay Williams, PHD is a Clinical Psychologist in Altamonte Springs, Florida. Licensed in Florida. Registered with an NPI since 2006.

Licensed in
FL
In the registry since
2006
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

See every abbreviation used in this directory →

Practice location Address checks out

989 Orienta Ave Life Care Center Of Altamonte
Altamonte Springs, FL 32701
Phone: (407) 831-3446
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence PY0003957 (FL)

Record details

NPI number1619998416
Entity typeIndividual (Type 1)
GenderMale
Credentials PHD
Sole proprietorNo
NPI enumeratedJuly 21, 2006
Last updated in NPPESJuly 8, 2007
Mailing address3851 Ethan Lane, Orlando, FL 32814-6567

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