Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Tammy Estabrook Acker, RN

Case Management Registered Nurse in Auburn, ME · enumerated 2019.

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

National Provider Identifier

1639739139

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Registry record

Entity type Individual (Type 1)

Name Tammy Estabrook Acker

Credential RN

Sex Female

Practice address 30 Belgrade Ave Ste A, Auburn, ME, 04210

Phone (207) 783-0018

Enumeration date Jun 17, 2019

Last updated in NPPES Jun 17, 2019

Taxonomy & licenses

163WC0400X Case Management Registered Nurse Nursing Service Providers · License RN26644 (ME) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

Is NPI 1639739139 active?

Yes, as of the latest NPPES snapshot, NPI 1639739139 is active (record last updated 2019-06-17).

How do I verify Tammy Acker's NPI record?

Cross-check NPI 1639739139 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 2019-06-17.