Justin Fong, M.D.
NPI 1841346608 · Internal Medicine Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Fong, M.D. is a Internal Medicine Physician provider in San Francisco, CA (NPI 1841346608).
Provider details
- NPI number
- 1841346608
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G57883 (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
19 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
1,189 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 644 | $85 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 229 | $145 |
| Residence Visit for Established Patient With High Level of Medical Decision Making, Per Day, If Using Time, at Least 60 Minutes99350 | 154 | $208 |
| Physician Or Allowed Practitioner Supervision of a Patient Receiving Medicare-Covered Services Provided By a Participating Home Health Agency (patient Not Present) Requiring Complex and Multidisciplinary Care Modalities Involving Regular Physician Or AllowG0181 | 62 | $123 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 40 | $211 |
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 |
|---|---|---|
| Amlodipine Besylate | 224 | 66 |
| Atorvastatin Calcium | 125 | 42 |
| Levothyroxine Sodium | 79 | 21 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 69 | 40 |
| Losartan Potassium | 65 | 24 |
| Metformin Hcl | 61 | 18 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-01-26
- Last updated
- 2009-09-01
Frequently asked questions
- What is Justin Fong's NPI number?
- Justin Fong's National Provider Identifier (NPI) is 1841346608, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Fong's specialty?
- Justin Fong is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Fong located?
- Justin Fong's practice location on file with NPPES is 3060 19th Ave, San Francisco, CA 94132-1627.
- What is Justin Fong's phone number?
- The practice phone number listed in the NPPES registry for Justin Fong is (415) 452-3155.
- Does Justin Fong accept Medicare?
- Justin Fong is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Fong's NPI active?
- Yes — Justin Fong's NPI (1841346608) is active in the NPPES registry as of the last update on 2009-09-01.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.