Quick answers
- Does Abraham G. Hsieh accept Medicare assignment?
- Yes. Medicare's clinician data says Abraham G. Hsieh accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Abraham G. Hsieh see?
- In 2024, CMS data shows 811 Original Medicare patients and 2,216 services for Abraham G. Hsieh. This counts Original Medicare only and measures volume, not quality.
- What is Abraham G. Hsieh's NPI number?
- 1679520076. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Abraham G. Hsieh, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 811 |
|---|---|
| Services billed to Medicare | 2,216 |
| Different services or procedures | 54 |
| Participating Medicare provider | Yes |
| Average age of these patients | 77 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)465 services
- Removal of impacted ear wax (69210)377 services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)331 services
- New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)217 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)194 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol75%
- High blood pressure71%
- Arthritis47%
- Osteoporosis27%
- Ischemic heart disease24%
- Chronic kidney disease24%
Hospitals where Abraham G. Hsieh works
Medicare's Facility Affiliation Data lists Abraham G. Hsieh at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- John Muir Medical Center - Concord CampusConcord, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050496
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050180
- San Ramon Regional Medical CenterSan Ramon, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050689
- Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
- Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283
Practice locations
Addresses where Abraham G. Hsieh is enrolled with Medicare (CMS data updated October 2, 2026).
- 2305 Camino Ramon, Suite 200San Ramon, CA 94583 (925) 242‑0647
- 2623 Shadelands Dr, Suite 1Walnut Creek, CA 94598 (925) 933‑8462
- 4725 1st St, Suite 100Pleasanton, CA 94566 (925) 462‑7060
- 5568 Gibraltar DrPleasanton, CA 94588 (888) 924‑1036
Group practices
Medicare enrollment lists Abraham G. Hsieh as a member of this group (CMS data updated October 2, 2026).
- University Healthcare Alliance327 clinicians in the group
Specialties
- Otolaryngologyprimary
Other ENT doctors in San Ramon
Clinicians with the same Medicare primary specialty in San Ramon, CA — not a recommendation.
Other clinicians in University Healthcare Alliance
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 1986 (40 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1679520076 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians