Quick answers
- Where does Alyssa L. O'Brien see patients?
- Medicare's clinician data lists 2 practice locations, including Portage, WI and Madison, WI. Call before your visit to confirm the address.
- What is Alyssa L. O'Brien's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Alyssa L. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Alyssa L. O'Brien accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Alyssa L. O'Brien?
- (608) 287-2770, as listed in official Medicare / NPI Registry data.
- What is Alyssa L. O'Brien's NPI number?
- 1922591742. 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 Alyssa L. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 2977 County Hwy CxPortage, WI 53901 (608) 287‑2770
- 600 Highland AveMadison, WI 53792 (608) 263‑6400
Group practices
Medicare enrollment lists Alyssa L. O'Brien as a member of this group (CMS data updated 2026-10-02).
- University of Wisconsin Medical Foundation Inc2,553 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Portage
Clinicians with the same Medicare primary specialty in Portage, WI — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Medical school | University Of Wisconsin School Of Medicine |
| Graduation year | 2018 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922591742 |
| 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 2026-10-02, retrieved 2026-10-29
- 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