Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Mark R. Olson, LCSW
Clinical Social Worker in Gray, ME · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1407884216
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Registry record
Entity type Individual (Type 1)
Name Mark R. Olson
Credential LCSW
Sex Male
Practice address 56 Charlonate Dr, Gray, ME, 04039
Phone (207) 657-2203
Fax (207) 657-2013
Enumeration date Jun 29, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License LC1018 (ME) Primary
LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy.
About the LCSW 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.
Frequently asked questions
What is the NPI number for Mark Olson?
The National Provider Identifier (NPI) for Mark Olson is 1407884216, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Olson practice?
The practice location on file with NPPES is in Gray, ME. Providers can have multiple locations; NPPES lists the primary practice address.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.