Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ms. Gail Robin Marcus, LCSW
Psychologist in Boulder, CO · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1033261888
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Registry record
Entity type Individual (Type 1)
Name Ms. Gail Robin Marcus
Credential LCSW
Sex Female
Practice address 1800 30th Street, Suite 217b, Boulder, CO, 80301
Phone (303) 641-6475
Enumeration date Jan 18, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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 Gail Marcus?
The National Provider Identifier (NPI) for Gail Marcus is 1033261888, a Type 1 (individual) record in the CMS NPPES registry.
Where does Gail Marcus practice?
The practice location on file with NPPES is in Boulder, CO. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.