Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Jessica Ellen Hammann, PH.D.

Clinical Psychologist in Weston, MA · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1013083021

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Registry record

Entity type Individual (Type 1)

Name Dr. Jessica Ellen Hammann

Credential PH.D.

Sex Female

Practice address Weston, MA, 02493

Phone (781) 899-6481

Enumeration date Nov 28, 2006

Last updated in NPPES Aug 9, 2010

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103TC0700X Clinical Psychologist Behavioral Health & Social Service Providers · License 916 PSY HEALTH SERVI (MA) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
051572000	Other	-	MAGELLAN BEHAVIORAL HEALT
411624	Other	MA	TUFTS
W01447	Other	MA	BLUE CROSS BLUE SHIELD

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Jessica Hammann practice?

The practice location on file with NPPES is in Weston, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Jessica Hammann?

The National Provider Identifier (NPI) for Jessica Hammann is 1013083021, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-08-09.