Timothy Chen, M.D.
NPI 1699017707 · Gastroenterology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Chen, M.D. is a Gastroenterology Physician provider in San Francisco, CA (NPI 1699017707).
Provider details
- NPI number
- 1699017707
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A136216 (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
13 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
1,148 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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 299 | $83 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 188 | $183 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 152 | $104 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 139 | $121 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 128 | $105 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 279 | 152 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 174 | 173 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 121 | 121 |
| Famotidine | 67 | 40 |
| Omeprazole | 37 | 12 |
| Metronidazole | 24 | 21 |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$1,870 across 73 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
Additional practice locations (2)
- 3801 Sacramento St Ste 300San Francisco, CA 94118-1625Phone: (415) 600-2402Fax: (415) 379-9870
- 2100 Webster St Ste 516San Francisco, CA 94115-2381Phone: (415) 600-2470Fax: (415) 369-1292
Registry dates
- Enumerated
- 2013-03-27
- Last updated
- 2022-02-14
- Certified
- 2022-02-14
Frequently asked questions
- What is Timothy Chen's NPI number?
- Timothy Chen's National Provider Identifier (NPI) is 1699017707, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Chen's specialty?
- Timothy Chen is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Chen located?
- Timothy Chen's practice location on file with NPPES is 2100 Webster St Ste 115, San Francisco, CA 94115-2374.
- What is Timothy Chen's phone number?
- The practice phone number listed in the NPPES registry for Timothy Chen is (415) 387-8800.
- Does Timothy Chen accept Medicare?
- Timothy Chen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Chen's NPI active?
- Yes — Timothy Chen's NPI (1699017707) is active in the NPPES registry as of the last update on 2022-02-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.