DR. PATTY PENG-JUNG CHI MD
NPI 1407898323
Allergy & Immunology in Mountain View, CA
About Dr. Patty Peng-jung Chi Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. PATTY PENG-JUNG CHI MD (NPI 1407898323) is an individual allergy & immunology provider in Mountain View, California, licensed in California (A82242) and active in the NPI registry since June 2006. She is enrolled in Medicare PECOS and is a graduate of University Of California, San Francisco School Of Medicine (1999).
NPPES Registry Identity
Specialties & Licenses 3
Other Identifiers 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. Patty Peng-jung Chi Md 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
4Medicare enrollment records show Patty Chi reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Santa Clara, CA 95051
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Palo Alto, CA 94301
- Reassigned Medicare billing, California enrollment
- 4,479 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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 8
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.
Referred Medical Equipment & Supplies CMS DME claims 2
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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MOUNTAIN VIEW, CA 94040
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 Patty Chi's NPI number?
The NPI number for Patty Chi is 1407898323. It was assigned to this individual provider in the NPPES registry on June 12, 2006.
Where is Patty Chi located?
Patty Chi practices at 701 E El Camino Real, Mountain View, CA 94040. The listed phone number is (650) 934-7888.
What is Patty Chi's specialty?
The primary specialty registered for this NPI is Allergy & Immunology with taxonomy code 207K00000X.
Is Patty Chi enrolled in Medicare?
Yes. Patty Chi 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 Patty Chi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Patty Chi reassigns Medicare benefits to 4 organizations: Permanente Medical Group Inc (Santa Clara, CA), Sutter Bay Medical Foundation (Palo Alto, CA), Regents Of The University Of California (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, CA). 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 Patty Chi'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 Patty Chi was last updated on December 21, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Patty Peng-Jung Chi, MD · NPI 1407898323
Allergy & Immunology physician in Mountain View, California. Individual provider, active in the CMS NPPES registry since June 12, 2006.
## Identity
- **NPI:** 1407898323 (Entity type: Individual)
- **Enumerated:** June 12, 2006
- **Primary specialty:** Allergy & Immunology · taxonomy 207K00000X
- **State license:** A82242 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 701 E EL CAMINO REAL, Mountain View, CA 94040-2833
- **Phone:** (650) 934-7888
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Permanente Medical Group Inc (NPI 1073606299, Santa Clara, CA); Sutter Bay Medical Foundation (NPI 1013950807, Palo Alto, CA); Regents Of The University Of California (NPI 1376613943, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 1999
## Record status
- **NPPES last updated:** December 21, 2022
- **Other identifiers:** Medicaid 00A822420 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1407898323) · Data from the CMS NPPES public registry.