Stephen Chan, MD
NPI 1982109138 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephen Chan, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1982109138).
Provider details
- NPI number
- 1982109138
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- Yes
- License
- 1261389 (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
8 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
1,027 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 547 | $152 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 132 | $19 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 114 | $156 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 69 | $110 |
| Admn Sarscov2 Vacc 1 Dose90480 | 68 | $52 |
| Administration of Influenza Virus Vaccine |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 66 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 357 | 115 |
| Amlodipine Besylate | 182 | 71 |
| Losartan Potassium | 132 | 44 |
| Levothyroxine Sodium | 117 | 30 |
| Tamsulosin Hcl | 93 | 29 |
| Lisinopril | 86 | 30 |
| Albuterol Sulfate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2018-03-29
- Last updated
- 2022-07-15
- Certified
- 2022-07-15
Frequently asked questions
- What is Stephen Chan's NPI number?
- Stephen Chan's National Provider Identifier (NPI) is 1982109138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephen Chan's specialty?
- Stephen Chan is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephen Chan located?
- Stephen Chan's practice location on file with NPPES is 2100 Webster St, San Francisco, CA 94115-2373.
- What is Stephen Chan's phone number?
- The practice phone number listed in the NPPES registry for Stephen Chan is (415) 600-2402.
- Does Stephen Chan accept Medicare?
- Stephen Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephen Chan's NPI active?
- Yes — Stephen Chan's NPI (1982109138) is active in the NPPES registry as of the last update on 2022-07-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.