Quick answers
- Does Judy Chang-Witt accept Medicare assignment?
- Yes. Medicare's clinician data says Judy Chang-Witt 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 Judy Chang-Witt see?
- In 2024, CMS data shows 16 Original Medicare patients and 29 services for Judy Chang-Witt. This counts Original Medicare only and measures volume, not quality.
- What is Judy Chang-Witt's NPI number?
- 1225326564. 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 Judy Chang-Witt, 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 | 16 |
|---|---|
| Services billed to Medicare | 29 |
| Different services or procedures | 8 |
| Participating Medicare provider | Yes |
| Average age of these patients | 61 |
Practice locations
Addresses where Judy Chang-Witt is enrolled with Medicare (CMS data updated October 2, 2026).
- 2500 Merced StSan Leandro, CA 94577 (510) 454‑1000
Group practices
Medicare enrollment lists Judy Chang-Witt as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Leandro
Clinicians with the same Medicare primary specialty in San Leandro, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 2011 (15 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1225326564 |
| 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