Quick answers
- Does James L. Chen accept Medicare assignment?
- Yes. Medicare's clinician data says James L. Chen 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 James L. Chen's NPI number?
- 1891870119. 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 James L. Chen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1100 Veterans BlvdRedwood City, CA 94063 (650) 299‑2000
- 1150 Veterans BlvdRedwood City, CA 94063 (650) 299‑2000
- 1190 Veterans BlvdRedwood City, CA 94063 (650) 299‑2000
Group practices
Medicare enrollment lists James L. Chen as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Allergy/Immunologyprimary
Other allergist and immunologists in Redwood City
Clinicians with the same Medicare primary specialty in Redwood City, 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 | DO |
|---|---|
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891870119 |
| 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