DR. KAREN YUE-SHANG FANN D.O.
NPI 1265635023
Otolaryngology in Mountain View, CA
About Dr. Karen Yue-shang Fann D.o. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KAREN YUE-SHANG FANN D.O. (NPI 1265635023) is an individual otolaryngology provider in Mountain View, California, licensed in California (20A9852) and active in the NPI registry since June 2007. She is enrolled in Medicare PECOS and is a graduate of Other (2002).
NPPES Registry Identity
Specialties & Licenses
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. Karen Yue-shang Fann D.o. 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
2Medicare enrollment records show Karen Fann reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Jose, CA 95128
- Reassigned Medicare billing, California enrollment
- 314 clinicians in this Medicare group
Los Gatos, CA 95032
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: El Camino Medical Associates PC
- 19 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 11
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 94040 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 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
MOUNTAIN VIEW, CA 94040
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 Karen Fann's NPI number?
The NPI number for Karen Fann is 1265635023. It was assigned to this individual provider in the NPPES registry on June 8, 2007.
Where is Karen Fann located?
Karen Fann practices at 2495 Hospital Dr Ste 450, Mountain View, CA 94040. The listed phone number is (650) 988-4161.
What is Karen Fann's specialty?
The primary specialty registered for this NPI is Otolaryngology with taxonomy code 207Y00000X.
Is Karen Fann enrolled in Medicare?
Yes. Karen Fann 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 Karen Fann's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Fann reassigns Medicare benefits to 2 organizations: El Camino Health Medical Network, LLC (San Jose, CA) and El Camino Health Medical Group (Los Gatos, 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 Karen Fann'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 Karen Fann was last updated on November 11, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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. Karen Yue-Shang Fann, D.O. · NPI 1265635023
Otolaryngology physician in Mountain View, California. Individual provider, active in the CMS NPPES registry since June 8, 2007.
## Identity
- **NPI:** 1265635023 (Entity type: Individual)
- **Enumerated:** June 8, 2007
- **Primary specialty:** Otolaryngology · taxonomy 207Y00000X
- **State license:** 20A9852 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 2495 HOSPITAL DR STE 450, Mountain View, CA 94040-4171
- **Phone:** (650) 988-4161 · **Fax:** (650) 988-4162
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): El Camino Health Medical Network, LLC (NPI 1164880761, San Jose, CA); El Camino Health Medical Group (NPI 1578831764, Los Gatos, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2002
## Record status
- **NPPES last updated:** November 11, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1265635023) · Data from the CMS NPPES public registry.