Quick answers
- Does Teresa S. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says Teresa S. Chang 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 Teresa S. Chang see?
- In 2024, CMS data shows 28 Original Medicare patients and 148 services for Teresa S. Chang. This counts Original Medicare only and measures volume, not quality.
- What is Teresa S. Chang's NPI number?
- 1447368295. 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 Teresa S. Chang, 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 | 28 |
|---|---|
| Services billed to Medicare | 148 |
| Different services or procedures | 17 |
| Participating Medicare provider | Yes |
| Average age of these patients | 73 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)33 services
- Blood test, comprehensive group of blood chemicals (80053)22 services
- Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count (85025)14 services
- Blood test, lipids (cholesterol and triglycerides) (80061)12 services
- Hemoglobin a1c level (83036)12 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 cholesterol68%
- High blood pressure50%
Hospitals where Teresa S. Chang works
Medicare's Facility Affiliation Data lists Teresa S. Chang at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Santa Ynez Valley Cottage HospitalSolvang, CA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 051331
Practice locations
Addresses where Teresa S. Chang is enrolled with Medicare (CMS data updated October 2, 2026).
- 1870 Lundy AveSan Jose, CA 95131 (408) 573‑9686
Group practices
Medicare enrollment lists Teresa S. Chang as a member of this group (CMS data updated October 2, 2026).
- North East Medical Services143 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Jose
Clinicians with the same Medicare primary specialty in San Jose, CA — not a recommendation.
Other clinicians in North East Medical Services
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2005 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447368295 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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