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.