Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Cassie A Kosarek, MD

Psychiatry Physician in Hanover, NH · enumerated 2021 · practices at Upper Valley Psychiatry P.L.L.C..

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

National Provider Identifier

1114504099

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Registry record

Entity type Individual (Type 1)

Name Dr. Cassie A Kosarek

Credential MD

Sex Female

Practice address 3 Lebanon St Ste 39, Hanover, NH, 03755

Phone (802) 526-4810

Enumeration date Mar 26, 2021

Last updated in NPPES Mar 4, 2026

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 042.0018707 (VT) Secondary

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License 35234 (NH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Cassie Kosarek practice?

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

What is the NPI number for Cassie Kosarek?

The National Provider Identifier (NPI) for Cassie Kosarek is 1114504099, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Upper Valley Psychiatry P.L.L.C. Health Service Clinic/Center · Hanover, NH NPI 1417833435

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-03-04.