Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Cassandra Jannsen
Psychologist in Worcester, MA · enumerated 2023.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508642711
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Registry record
Entity type Individual (Type 1)
Name Cassandra Jannsen
Sex Female
Practice address 335 Chandler St, Worcester, MA, 01602
Phone (508) 791-3261
Enumeration date Sep 4, 2023
Last updated in NPPES Sep 4, 2023
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
Where does Cassandra Jannsen practice?
The practice location on file with NPPES is in Worcester, MA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Cassandra Jannsen?
The National Provider Identifier (NPI) for Cassandra Jannsen is 1508642711, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-04.