Quick answers
- Does Mary S. O'Halloran accept Medicare assignment?
- Yes. Medicare's clinician data says Mary S. O'Halloran accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- What is Mary S. O'Halloran's NPI number?
- 1477123511. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mary S. O'Halloran is enrolled with Medicare (CMS data updated October 2, 2026).
- 1751 Hover St, Suite B4Longmont, CO 80501 (720) 635‑0755
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in Longmont
Clinicians with the same Medicare primary specialty in Longmont, CO — not a recommendation.
Clinician information
| Credential | CP |
|---|---|
| Graduation year | 1989 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1477123511 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians