Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Mary Sean O'Halloran, LP

Individual provider Psychologist · NPI 1477123511

Dr. Mary Sean O'Halloran, LP is a Clinical Psychologist in Longmont, Colorado. Qualified in 1989, 37 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in Colorado.

Years since qualifying
37
Licensed in
CO
In the registry since
2021
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Practice location Address checks out

1751 Hover St Ste B4
Longmont, CO 80501-7181
Phone: (720) 635-0755
Fax: (303) 223-3306
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Psychologist (primary) Taxonomy 103T00000X · Licence 2218 (CO)

Record details

NPI number1477123511
Entity typeIndividual (Type 1)
GenderFemale
Credentials LP
Sole proprietorYes
NPI enumeratedJune 30, 2021
Last updated in NPPESSeptember 20, 2021
Certification dateSeptember 20, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1989 (37 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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