Quick answers
- Does Katherine L. Possin accept Medicare assignment?
- Yes. Medicare's clinician data says Katherine L. Possin 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.
- How many Medicare patients does Katherine L. Possin see?
- In 2024, CMS data shows 57 Original Medicare patients and 235 services for Katherine L. Possin. This counts Original Medicare only and measures volume, not quality.
- What is Katherine L. Possin's NPI number?
- 1275848251. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Katherine L. Possin, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 57 |
|---|---|
| Services billed to Medicare | 235 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 78 |
Most frequent services
- Evaluation of neuropsychological test, first hour (96132)57 services
- Evaluation of neuropsychological test, each additional hour (96133)57 services
- Administration of psychological or neuropsychological test by technician, each additional 30 minutes (96139)36 services
- Administration of psychological or neuropsychological test, first 30 minutes (96136)25 services
- Exam of neurobehavioral status, first hour (96116)23 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure65%
- Arthritis46%
- Alzheimer's disease or dementia37%
- Depression30%
- Anxiety23%
Practice locations
Addresses where Katherine L. Possin is enrolled with Medicare (CMS data updated October 2, 2026).
- 1500 Owen StSan Francisco, CA 94143 (415) 476‑1000
Group practices
Medicare enrollment lists Katherine L. Possin as a member of this group (CMS data updated October 2, 2026).
- University of California San Francisco1,839 clinicians in the group
Specialties
- Clinical Psychologistprimary
Other clinical psychologists in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, CA — not a recommendation.
Other clinicians in University of California San Francisco
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Graduation year | 2007 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1275848251 |
| 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
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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