Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Christyn Sieve, PSY, D.

Psychologist in Portsmouth, NH · enumerated 2007.

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

National Provider Identifier

1578607743

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Registry record

Entity type Individual (Type 1)

Name Christyn Sieve

Credential PSY, D.

Sex Female

Practice address 1 Cate St, Portsmouth, NH, 03801

Phone (603) 433-2626

Fax (603) 433-2736

Enumeration date Feb 19, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License NH964 (NH) Primary

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

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 Christyn Sieve?

Christyn Sieve is registered in NPPES with the primary taxonomy of Psychologist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.