Justin Chan, M.D.
NPI 1003818501 · Family Medicine Physician · Alhambra, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Chan, M.D. is a Family Medicine Physician provider in Alhambra, CA (NPI 1003818501).
Provider details
- NPI number
- 1003818501
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G79829 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
877 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 560 | $99 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 119 | $139 |
| Annual Depression Screening, 5 to 15 MinutesG0444 | 43 | $21 |
| Annual Wellness Visit; Includes a Personalized Prevention Plan of Service (pps), Initial VisitG0438 | 38 | $178 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 37 | $141 |
| Administration of Influenza Virus VaccineG0008 | 22 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 152 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 950 | 219 |
| Amlodipine Besylate | 555 | 107 |
| Metformin Hcl | 453 | 95 |
| Losartan Potassium | 361 | 71 |
| Alendronate Sodium | 352 | 79 |
| Levothyroxine Sodium | 255 | 52 |
| Triamcinolone Acetonide | 243 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,670 across 44 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-08-15
- Last updated
- 2007-07-09
Frequently asked questions
- What is Justin Chan's NPI number?
- Justin Chan's National Provider Identifier (NPI) is 1003818501, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Chan's specialty?
- Justin Chan is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Chan located?
- Justin Chan's practice location on file with NPPES is 925 S Garfield Ave, Alhambra, CA 91801-4442.
- What is Justin Chan's phone number?
- The practice phone number listed in the NPPES registry for Justin Chan is (626) 282-0282.
- Does Justin Chan accept Medicare?
- Justin Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Chan's NPI active?
- Yes — Justin Chan's NPI (1003818501) is active in the NPPES registry as of the last update on 2007-07-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.