Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Donna Lynn Hacker
Counselor in Napa, CA · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1720204563
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Registry record
Entity type Individual (Type 1)
Name Ms. Donna Lynn Hacker
Sex Female
Practice address 829 Jefferson St, Napa, CA, 94559
Phone (707) 253-8470
Fax (707) 253-1182
Enumeration date Apr 18, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Donna Hacker?
Donna Hacker is registered in NPPES with the primary taxonomy of Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
Browse all → Genevieve Henry Counselor · Napa, CA NPI 1790834729 Behavioral Solutions for Children, Inc Community/Behavioral Health Agency · Napa, CA NPI 1558410654 Noelle Fuimaono Counselor · Napa, CA NPI 1447309315 Tracey Weigand Counselor · Napa, CA NPI 1730238882 Vicki Caul-Posey Counselor · Napa, CA NPI 1497971196 Napa Valley Caring Companions LLC In Home Supportive Care Agency · Napa, CA NPI 1326569435 Cathie Gordon Psychotherapy Marriage & Family Therapist · Napa, CA NPI 1356980866
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.