DENNIS HSIEH M.D.
NPI 1649520701
Emergency Medicine in Oakland, CA
About Dennis Hsieh M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DENNIS HSIEH M.D. (NPI 1649520701) is an individual emergency medicine provider in Oakland, California, licensed in California (A129373) and active in the NPI registry since September 2012. He is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (2012).
NPPES Registry Identity
Specialties & Licenses 3
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dennis Hsieh M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
10Medicare enrollment records show Dennis Hsieh reassigns Medicare billing to 10 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Alameda, CA 94501
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1548216260 (California)
- 2,323 clinicians in this Medicare group
San Francisco, CA 94133
- Reassigned Medicare billing, California enrollment
- 27 clinicians in this Medicare group
San Ramon, CA 94583
- Reassigned Medicare billing, California enrollment
- 168 clinicians in this Medicare group
Palo Alto, CA 94306
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1043354020 (California), NPI 1629301346 (California)
- 2,460 clinicians in this Medicare group
Fairfield, CA 94533
- Reassigned Medicare billing, California enrollment
- 212 clinicians in this Medicare group
San Jose, CA 95128
- Reassigned Medicare billing, California enrollment
- 197 clinicians in this Medicare group
Delano, CA 93215
- Reassigned Medicare billing, California enrollment
- 301 clinicians in this Medicare group
Lancaster, CA 93535
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: County Of Los Angeles
- 1,939 clinicians in this Medicare group
Inglewood, CA 90301
- Reassigned Medicare billing, California enrollment
- 111 clinicians in this Medicare group
San Pedro, CA 90732
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Stephen R Shea MD Inc
- 50 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94602 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAKLAND, CA 94602
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Dennis Hsieh's NPI number?
The NPI number for Dennis Hsieh is 1649520701. It was assigned to this individual provider in the NPPES registry on September 17, 2012.
Where is Dennis Hsieh located?
Dennis Hsieh practices at 1411 E 31st St C/O Auanja Thompson, Department Of Emergency Medicine, Oakland, CA 94602. The listed phone number is (857) 998-0024.
What is Dennis Hsieh's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Dennis Hsieh enrolled in Medicare?
Yes. Dennis Hsieh is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Dennis Hsieh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Dennis Hsieh reassigns Medicare benefits to 10 organizations: Cep America - California (Alameda, CA), California Emergency Associates A California Medical Corporation (San Francisco, CA), San Francisco Physicians International Medical Group, Inc (San Ramon, CA), County Of Santa Clara (Palo Alto, CA), Solano Gateway Medical Group Inc (Fairfield, CA) and 5 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Dennis Hsieh's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Dennis Hsieh was last updated on June 4, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dennis Hsieh, M.D. · NPI 1649520701
Emergency Medicine physician in Oakland, California. Individual provider, active in the CMS NPPES registry since September 17, 2012.
## Identity
- **NPI:** 1649520701 (Entity type: Individual)
- **Enumerated:** September 17, 2012
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A129373 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1411 E 31ST ST, C/O AUANJA THOMPSON, DEPARTMENT OF EMERGENCY MEDICINE, Oakland, CA 94602-1018
- **Phone:** (857) 998-0024
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 10 organizations under Medicare reassignment (form CMS-855R): Cep America - California (NPI 1821017971, Alameda, CA); California Emergency Associates A California Medical Corporation (NPI 1437611936, San Francisco, CA); San Francisco Physicians International Medical Group, Inc (NPI 1841220720, San Ramon, CA); County Of Santa Clara (NPI 1285228080, Palo Alto, CA); Solano Gateway Medical Group Inc (NPI 1952344293, Fairfield, CA); and 5 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 2012
## Record status
- **NPPES last updated:** June 4, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1649520701) · Data from the CMS NPPES public registry.