Yen Quang, M.D.
NPI 1326228487 · Gastroenterology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Yen Quang, M.D. is a Gastroenterology Physician provider in San Francisco, CA (NPI 1326228487).
Provider details
- NPI number
- 1326228487
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- A101985 (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
18 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
366 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 104 | $146 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $104 |
| Moderate Sedation Services Provided By the Same Physician Or Other Qualified Health Care Professional Performing a Gastrointestinal Endoscopic Service That Sedation Supports, Requiring the Presence of an Independent Trained Observer to Assist in the MonitoG0500 | 63 | $6 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 44 | $125 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 32 | $84 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Famotidine | 133 | 80 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 129 | 126 |
| Omeprazole | 107 | 68 |
| Pantoprazole Sodium | 64 | 39 |
| Tenofovir Alafenamidebrand: Vemlidy | 54 | — |
| Linaclotidebrand: Linzess | 32 | 11 |
| Tenofovir Disoproxil Fumarate | 31 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$169 across 2 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
- 2007-11-06
- Last updated
- 2018-06-11
Frequently asked questions
- What is Yen Quang's NPI number?
- Yen Quang's National Provider Identifier (NPI) is 1326228487, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Yen Quang's specialty?
- Yen Quang is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Yen Quang located?
- Yen Quang's practice location on file with NPPES is 1199 Bush St Ste 560, San Francisco, CA 94109.
- What is Yen Quang's phone number?
- The practice phone number listed in the NPPES registry for Yen Quang is (415) 885-8080.
- Does Yen Quang accept Medicare?
- Yen Quang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Yen Quang's NPI active?
- Yes — Yen Quang's NPI (1326228487) is active in the NPPES registry as of the last update on 2018-06-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.