Quick answers
- Does Kathleen H. O'Sullivan accept Medicare assignment?
- Yes. Medicare's clinician data says Kathleen H. O'Sullivan 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 Kathleen H. O'Sullivan's NPI number?
- 1982409785. 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 Kathleen H. O'Sullivan is enrolled with Medicare (CMS data updated October 2, 2026).
- 135 S State College Blvd, Suite 200Brea, CA 92821
Group practices
Medicare enrollment lists Kathleen H. O'Sullivan as a member of these groups (CMS data updated October 2, 2026).
- Ming-Wei Wu Inc37 clinicians in the group
- Professional Wound Specialists PC8 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Brea
Clinicians with the same Medicare primary specialty in Brea, CA — not a recommendation.
Other clinicians in Ming-Wei Wu Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2024 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982409785 |
| 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