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

Mr. Gary Allen Williams, CACII

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1235829292

Mr. Gary Allen Williams, CACII is an Addiction (Substance Use Disorder) Counselor in Washington, District of Columbia. Practices as a sole proprietor. Licensed in District of Columbia.

Licensed in
DC
In the registry since
2023

Practice location Address checks out

124 15th St SE
Washington, DC 20003-1519
Phone: (202) 543-4558
Fax: (202) 543-4579
Show map & directions

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

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence 1291 (DC)

Record details

NPI number1235829292
Entity typeIndividual (Type 1)
GenderMale
Credentials CACII
Sole proprietorYes
NPI enumeratedMay 11, 2023
Last updated in NPPESMay 11, 2023
Certification dateMay 11, 2023

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