Quick answers
- Does Lydia H. Chan accept Medicare assignment?
- Yes. Medicare's clinician data says Lydia H. Chan 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 Lydia H. Chan see?
- In 2024, CMS data shows 144 Original Medicare patients and 1,458 services for Lydia H. Chan. This counts Original Medicare only and measures volume, not quality.
- What is Lydia H. Chan's NPI number?
- 1578900452. 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 Lydia H. Chan, 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 | 144 |
|---|---|
| Services billed to Medicare | 1,458 |
| Different services or procedures | 33 |
| Participating Medicare provider | Yes |
| Average age of these patients | 71 |
Most frequent services
- Insertion of needle into vein for collection of blood sample (36415)239 services
- Hemoglobin a1c level (83036)157 services
- Creatinine level to test for kidney function or muscle injury (82570)155 services
- Urine microalbumin (protein) level (82043)139 services
- Blood test, lipids (cholesterol and triglycerides) (80061)113 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%
- Diabetes46%
- Osteoporosis26%
- Chronic kidney disease17%
- Arthritis12%
Hospitals where Lydia H. Chan works
Medicare's Facility Affiliation Data lists Lydia H. Chan 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.
- California Pacific Medical Center - Mission BernalSan Francisco, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050055
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050047
- California Pacific Medical Center-Davies Campus HospitalSan Francisco, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050008
- Zuckerberg San Francisco General Hospital & Trauma CenterSan Francisco, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050228
Practice locations
Addresses where Lydia H. Chan is enrolled with Medicare (CMS data updated October 2, 2026).
- 1520 Stockton StSan Francisco, CA 94133 (415) 391‑9686
- 211 Eastmoor AveDaly City, CA 94015 (415) 391‑9686
- 2574 San Bruno AveSan Francisco, CA 94134 (415) 391‑9686
- 82 Leland AveSan Francisco, CA 94134 (415) 391‑9688
Group practices
Medicare enrollment lists Lydia H. Chan as a member of this group (CMS data updated October 2, 2026).
- North East Medical Services143 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in San Francisco
Clinicians with the same Medicare primary specialty in San Francisco, 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 | MD |
|---|---|
| Graduation year | 2012 (14 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578900452 |
| 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