Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Mary Josephine Hendrickson, PHD
Psychologist in Issaquah, WA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699755561
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Registry record
Entity type Individual (Type 1)
Name Dr. Mary Josephine Hendrickson
Credential PHD
Sex Female
Practice address 22500 Se 64th Pl Ste 230, Issaquah, WA, 98027
Phone (425) 409-6414
Fax (425) 409-6618
Enumeration date Jan 18, 2006
Last updated in NPPES Oct 3, 2025
Taxonomy & licenses
103T00000X Psychologist Behavioral Health & Social Service Providers · License PY00002719 (WA) Primary
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Mary Hendrickson practice?
The practice location on file with NPPES is in Issaquah, WA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Mary Hendrickson?
The National Provider Identifier (NPI) for Mary Hendrickson is 1699755561, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Shelley Howell Clinical Psychologist · Issaquah, WA NPI 1194035725 Rita Simeone Clinical Social Worker · Issaquah, WA NPI 1851642870 Sarah Campbell Mental Health Counselor · Issaquah, WA NPI 1770928491 Catherine Lindberg Mental Health Counselor · Issaquah, WA NPI 1780010298 Aaron Abrams Marriage & Family Therapist · Issaquah, WA NPI 1710462452
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-03.