James Chan, M.D.
NPI 1033437231 · Hospitalist Physician · Antioch, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
James Chan, M.D. is a Hospitalist Physician provider in Antioch, CA (NPI 1033437231).
Provider details
- NPI number
- 1033437231
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A126160 (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
16 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
36 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 23 | $88 |
| Hospital Discharge Day Management, 30 Minutes Or Less99238 | 13 | $92 |
Typical Medicare-allowed amounts for these services range $88–$92 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 32 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 75 | 48 |
| Atorvastatin Calcium | 49 | 32 |
| Amlodipine Besylate | 45 | 30 |
| Metoprolol Tartrate | 39 | 25 |
| Furosemide | 39 | 34 |
| Tamsulosin Hcl | 36 | 20 |
| Metoprolol Succinate |
Practice location
Mailing address
Registry dates
- Enumerated
- 2010-05-12
- Last updated
- 2021-12-15
Frequently asked questions
- What is James Chan's NPI number?
- James Chan's National Provider Identifier (NPI) is 1033437231, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is James Chan's specialty?
- James Chan is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is James Chan located?
- James Chan's practice location on file with NPPES is 4501 Sand Creek Rd, Antioch, CA 94531-8687.
- What is James Chan's phone number?
- The practice phone number listed in the NPPES registry for James Chan is (925) 813-6500.
- Does James Chan accept Medicare?
- James Chan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is James Chan's NPI active?
- Yes — James Chan's NPI (1033437231) is active in the NPPES registry as of the last update on 2021-12-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.