DR. UYEN-CHI N HUYNH M.D.
NPI 1205271335
Internal Medicine in Walnut Creek, CA
About Dr. Uyen-chi N Huynh M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. UYEN-CHI N HUYNH M.D. (NPI 1205271335) is an individual internal medicine provider in Walnut Creek, California, licensed in California (A138368) and active in the NPI registry since May 2013. She is enrolled in Medicare PECOS, maintains a secondary practice location in San Francisco, and is a graduate of Other (2013).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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
Dr. Uyen-chi N Huynh 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
7Medicare enrollment records show Uyen-chi Huynh reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Walnut Creek, CA 94598
- Reassigned Medicare billing, California enrollment
- 810 clinicians in this Medicare group
Walnut Creek, CA 94597
- Reassigned Medicare billing, California enrollment
- 650 clinicians in this Medicare group
Berkely, CA 94710
- Reassigned Medicare billing, California enrollment
- 35 clinicians in this Medicare group
Hayward, CA 94541
- Reassigned Medicare billing, California enrollment
San Francisco, CA 94109
- Reassigned Medicare billing, California enrollment
- 213 clinicians in this Medicare group
San Jose, CA 95128
- Reassigned Medicare billing, California enrollment
- 32 clinicians in this Medicare group
Colton, CA 92324
- Reassigned Medicare billing, California enrollment
- 338 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 14
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 94595 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.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 7
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Uyen-chi Huynh's NPI number?
The NPI number for Uyen-chi Huynh is 1205271335. It was assigned to this individual provider in the NPPES registry on May 2, 2013.
Where is Uyen-chi Huynh located?
Uyen-chi Huynh practices at 1220 Rossmoor Parkway, Walnut Creek, CA 94595. The listed phone number is (925) 947-3312.
What is Uyen-chi Huynh's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Uyen-chi Huynh enrolled in Medicare?
Yes. Uyen-chi Huynh 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 Uyen-chi Huynh's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Uyen-chi Huynh reassigns Medicare benefits to 7 organizations: John Muir Trauma Physicians Billing Service (Walnut Creek, CA), John Muir Physician Network (Walnut Creek, CA), Inpatient Consultants Of California, Inc. (Berkely, CA), Huynh Elevate Health Care PC (Hayward, CA), Pacific Inpatient Medical Group (San Francisco, CA) and 2 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 Uyen-chi Huynh'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 Uyen-chi Huynh was last updated on December 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months 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.
# Dr. Uyen-Chi N Huynh, M.D. · NPI 1205271335
Internal Medicine physician in Walnut Creek, California. Individual provider, active in the CMS NPPES registry since May 2, 2013.
## Identity
- **NPI:** 1205271335 (Entity type: Individual)
- **Enumerated:** May 2, 2013
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A138368 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1220 ROSSMOOR PARKWAY, Walnut Creek, CA 94595-2501
- **Phone:** (925) 947-3312 · **Fax:** (925) 947-3396
## 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:** 7 organizations under Medicare reassignment (form CMS-855R): John Muir Trauma Physicians Billing Service (NPI 1093864837, Walnut Creek, CA); John Muir Physician Network (NPI 1841407665, Walnut Creek, CA); Inpatient Consultants Of California, Inc. (NPI 1831134253, Berkely, CA); Huynh Elevate Health Care PC (NPI 1013615392, Hayward, CA); Pacific Inpatient Medical Group (NPI 1447447248, San Francisco, CA); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2013
## Record status
- **NPPES last updated:** December 19, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1205271335) · Data from the CMS NPPES public registry.