Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Allison E. Shaffer

Nurse Practitioner in Portland, ME · enumerated 2020.

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

National Provider Identifier

1821684457

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Registry record

Entity type Individual (Type 1)

Name Allison E. Shaffer

Sex Female

Practice address 17 Bishop St, Portland, ME, 04103

Phone (207) 203-7933

Enumeration date Dec 17, 2020

Last updated in NPPES Sep 5, 2025

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License CNP251331 (ME) Primary

163W00000X Registered Nurse Nursing Service Providers · License RN72170 (ME) Secondary

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 NPI 1821684457 active?

Yes, as of the latest NPPES snapshot, NPI 1821684457 is active (record last updated 2025-09-05).

How do I verify Allison Shaffer's NPI record?

Cross-check NPI 1821684457 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-05.