Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary-Ellen Ostherr, MA LADC CCS

Addiction (Substance Use Disorder) Counselor in Rockland, ME · enumerated 2006.

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

National Provider Identifier

1407936669

Verified

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Registry record

Entity type Individual (Type 1)

Name Mary-Ellen Ostherr

Credential MA LADC CCS

Sex Female

Practice address 17 Masonic Street, Rockland, ME, 04841

Phone (207) 841-6775

Fax (207) 236-8073

Enumeration date Oct 16, 2006

Last updated in NPPES Jun 11, 2008

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License LC3421 (ME) Primary

Other identifiers

Identifier	Type	State	Issuer
104000000	Medicaid	ME	-

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

Where does Mary-Ellen Ostherr practice?

The practice location on file with NPPES is in Rockland, ME. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mary-Ellen Ostherr?

The National Provider Identifier (NPI) for Mary-Ellen Ostherr is 1407936669, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-06-11.