Mary Hu, M.D.
NPI 1659339059 · Gastroenterology Physician · Fremont, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Hu, M.D. is a Gastroenterology Physician provider in Fremont, CA (NPI 1659339059).
Provider details
- NPI number
- 1659339059
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- A84011 (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
20 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
312 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) |
|---|---|---|
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 89 | $163 |
| 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 | 71 | $6 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 63 | $215 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 40 | $101 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 33 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 129 | 46 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 106 | 104 |
| Famotidine | 74 | 21 |
| Pantoprazole Sodium | 60 | 20 |
| Mesalamine | 50 | — |
| Tenofovir Alafenamidebrand: Vemlidy | 32 | — |
| Tenofovir Disoproxil Fumarate | 28 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-03
- Last updated
- 2020-05-27
- Certified
- 2020-05-27
Frequently asked questions
- What is Mary Hu's NPI number?
- Mary Hu's National Provider Identifier (NPI) is 1659339059, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Hu's specialty?
- Mary Hu is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Hu located?
- Mary Hu's practice location on file with NPPES is 3200 Kearney St, Fremont, CA 94538-2299.
- What is Mary Hu's phone number?
- The practice phone number listed in the NPPES registry for Mary Hu is (510) 490-1222.
- Does Mary Hu accept Medicare?
- Mary Hu is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Hu's NPI active?
- Yes — Mary Hu's NPI (1659339059) is active in the NPPES registry as of the last update on 2020-05-27.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.