Lydia Chan, M.D.
NPI 1578900452 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lydia Chan, M.D. is a Internal Medicine Physician provider in San Francisco, CA (NPI 1578900452).
Provider details
- NPI number
- 1578900452
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 137928 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
13 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,384 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 239 | $6 |
| Hemoglobin A1c Level83036 | 157 | $10 |
| Creatinine Level to Test for Kidney Function Or Muscle Injury82570 | 155 | $5 |
| Urine Microalbumin (protein) Level82043 | 139 | $6 |
| Blood Test, Lipids (cholesterol and Triglycerides)80061 | 113 | $13 |
| Blood Test, Comprehensive Group of Blood Chemicals80053 | 108 | $10 |
| Blood Test, Thyroid Stimulating Hormone (tsh) |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 62 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 475 | 159 |
| Losartan Potassium | 240 | 75 |
| Amlodipine Besylate | 220 | 71 |
| Alendronate Sodium | 123 | 38 |
| Gabapentin | 120 | 50 |
| Triamcinolone Acetonide | 108 | 42 |
| Fluticasone Propionate | 103 | 37 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2013-05-31
- Last updated
- 2019-06-27
Frequently asked questions
- What is Lydia Chan's NPI number?
- Lydia Chan's National Provider Identifier (NPI) is 1578900452, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lydia Chan's specialty?
- Lydia Chan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Lydia Chan located?
- Lydia Chan's practice location on file with NPPES is 2674 San Bruno Avenue, San Francisco, CA 94134.
- What is Lydia Chan's phone number?
- The practice phone number listed in the NPPES registry for Lydia Chan is (415) 750-5909.
- Does Lydia Chan accept Medicare?
- Lydia Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lydia Chan's NPI active?
- Yes — Lydia Chan's NPI (1578900452) is active in the NPPES registry as of the last update on 2019-06-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.