Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Allison Siden

School Counselor in Plymouth, MA · enumerated 2021.

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

National Provider Identifier

1033700851

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Allison Siden

Sex Female

Practice address 6 Bradford Ter, Plymouth, MA, 02360

Phone (631) 901-6624

Enumeration date Feb 3, 2021

Last updated in NPPES Feb 3, 2021

Taxonomy & licenses

101YS0200X School Counselor Behavioral Health & Social Service Providers 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.

Read the full guide → Validate an NPI →

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 Allison Siden?

Allison Siden is registered in NPPES with the primary taxonomy of School Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-03.