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

Johna Kathleen Hammaker

Individual provider Addiction (Substance Use Disorder) Counselor · NPI 1821628256

Johna Kathleen Hammaker is an Addiction (Substance Use Disorder) Counselor in Fullerton, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2020

Practice location Address checks out

771 W Orangethorpe Ave
Fullerton, CA 92832-2806
Phone: (714) 879-0929
Fax: (714) 578-2960
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction (Substance Use Disorder) Counselor (primary) Taxonomy 101YA0400X · Licence CI40501023 (CA)

Record details

NPI number1821628256
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedJanuary 24, 2020
Last updated in NPPESOctober 23, 2023
Certification dateOctober 23, 2023
Mailing address771 W Orangethorpe Ave, Fullerton, CA 92832-2806

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