Mary Sean O'Halloran, LP
Psychologist · Longmont, CO
Mary Sean O'Halloran, LP is a psychologist with a practice address in Longmont, Colorado, and NPI 1477123511, issued on Jun 30, 2021. Check the license (Colorado 2218, as entered in NPPES) with the Colorado board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mary Sean O'Halloran
- Credential
- LP
- Primary taxonomy
- Psychologist 103T00000X
- License number
- 2218 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1751 Hover St, Longmont, CO 80501
- Phone
- (720) 635-0755
- Enumerated
- Jun 30, 2021
- Record last updated
- Sep 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (303) 223-3306
- Medicare enrollment
- Enrolled (PECOS I20210923002733); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychologist records → All 991 in Colorado → Look up another NPI →
Also registered at 1751 Hover St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Kathleen Winterhalter, PT, DPTPhysical Therapist1740633486
Verify Mary Sean O'Halloran in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 2218Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mary Sean O'Halloran among 991 psychologist records in Colorado
Mary Sean O'Halloran, LP is one of 991 psychologist records with a practice address in Colorado. 9% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2021, is newer than 82% of them.
- NPI issued2021 · 82% of these records are older, 14% newer
- In a Medicare fileNo · 9% of these records are
- In the CMS Doctors and Clinicians fileYes · 17% of these records are
- Graduated1989 · median 2006 among the 164 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103T00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychologist providers in Colorado
There are 991 psychologist records in Colorado. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 991 in Colorado → Every provider in Longmont → Psychologist nationwide →
The 8 psychologist records with the nearest ZIP codes
- Gerry Doran, PH.D.Longmont, CO 805011902128671
- James Evans, PH.D.Longmont, CO 805011306908686
- Tracie GiargiariLongmont, CO 805011275968497
- Kathrine Hak, PH.D.Longmont, CO 805011750624862
- Louis Krupnick, ED.D.Longmont, CO 805011932290525
- Julie Mack, PH.D.Longmont, CO 805011417000902
- Patricia O'Connor, PH.D.Longmont, CO 805011487899340
- Johannah PeayLongmont, CO 805011780241968
Common questions
What is Mary Sean O'Halloran, LP's NPI number?
Mary Sean O'Halloran, LP's National Provider Identifier (NPI) is 1477123511, issued on Jun 30, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mary Sean O'Halloran, LP located?
The NPPES record lists a practice address at 1751 Hover St, Longmont, CO, 80501. Phone: (720) 635-0755. Providers update this record themselves, so call before visiting.
How can I verify Mary Sean O'Halloran, LP's license?
NPPES lists Colorado license number 2218, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.