Joseph Chen, M.D.
NPI 1558500603 · Gastroenterology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chen, M.D. is a Gastroenterology Physician provider in San Francisco, CA (NPI 1558500603).
Provider details
- NPI number
- 1558500603
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A88094 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
17 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 18 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 316 | 301 |
| Pantoprazole Sodium | 203 | 88 |
| Famotidine | 86 | 43 |
| Mesalamine | 43 | 16 |
| Budesonidebrand: Budesonide Dr | 37 | — |
| Rifaximinbrand: Xifaxan | 37 | 24 |
| Cholestyraminebrand: Cholestyramine Light | 32 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,019 across 4 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
- 2009-02-12
- Last updated
- 2022-02-11
Frequently asked questions
- What is Joseph Chen's NPI number?
- Joseph Chen's National Provider Identifier (NPI) is 1558500603, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chen's specialty?
- Joseph Chen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chen located?
- Joseph Chen's practice location on file with NPPES is Department of Gastroenterology 513 Parnassus Ave, San Francisco, CA 94143-0001.
- What is Joseph Chen's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chen is (415) 443-4692.
- Does Joseph Chen accept Medicare?
- Joseph Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chen's NPI active?
- Yes — Joseph Chen's NPI (1558500603) is active in the NPPES registry as of the last update on 2022-02-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.