Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Christyn Sieve Psyd Psychological Services Pllc

Adult Mental Health Clinic/Center in Portsmouth, NH · enumerated 2021 · authorized official Christyn Sieve, Clinical Psychologist.

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

National Provider Identifier

1326636903

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Registry record

Entity type Organization (Type 2)

Legal business name Christyn Sieve Psyd Psychological Services Pllc

Practice address 439 Middle St, Portsmouth, NH, 03801

Phone (603) 498-1575

Enumeration date Jan 8, 2021

Last updated in NPPES Jan 8, 2021

Taxonomy & classification

261QM0850X Adult Mental Health Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Christyn Sieve

Title Clinical Psychologist

Phone (603) 498-1575

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.

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Frequently asked questions

Who is the authorized official for Christyn Sieve Psyd Psychological Services Pllc?

NPPES lists Christyn Sieve (Clinical Psychologist) as the authorized official for this organization.

What is the NPI number for Christyn Sieve Psyd Psychological Services Pllc?

The NPI for Christyn Sieve Psyd Psychological Services Pllc is 1326636903, a Type 2 (organization) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-08.