KEN ZAFREN MD
NPI 1366466120
Emergency Medicine in Stanford, CA
About Ken Zafren Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KEN ZAFREN MD (NPI 1366466120) is an individual emergency medicine provider in Stanford, California, licensed in California (G70948) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Anchorage, and is a graduate of University Of Washington School Of Medicine (1984).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
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
Ken Zafren 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
3Medicare enrollment records show Ken Zafren reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Stanford, CA 94305
- Reassigned Medicare billing, California enrollment
- 4,258 clinicians in this Medicare group
Palo Alto, CA 94304
- Reassigned Medicare billing, California enrollment
- 3,617 clinicians in this Medicare group
Anchorage, AK 99508
- Reassigned Medicare billing, Texas enrollment
- 1,373 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 3
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 94305 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.
STANFORD, CA 94305
STANFORD, CA 94305
STANFORD, CA 94305
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 Ken Zafren's NPI number?
The NPI number for Ken Zafren is 1366466120. It was assigned to this individual provider in the NPPES registry on July 26, 2006.
Where is Ken Zafren located?
Ken Zafren practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-0000.
What is Ken Zafren's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Ken Zafren enrolled in Medicare?
Yes. Ken Zafren 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 Ken Zafren's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ken Zafren reassigns Medicare benefits to 3 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA) and Alaska Native Tribal Health Consortium (Anchorage, AK). 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 Ken Zafren's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Ken Zafren accept?
Health plans from Moda Health Plan, Inc. list Ken Zafren as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Ken Zafren was last updated on March 21, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Ken Zafren, MD · NPI 1366466120
Emergency Medicine physician in Stanford, California. Individual provider, active in the CMS NPPES registry since July 26, 2006.
## Identity
- **NPI:** 1366466120 (Entity type: Individual)
- **Enumerated:** July 26, 2006
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** G70948 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-0000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Stanford Health Care (NPI 1437292927, Stanford, CA); Lpch Medical Group Div Of Lucile (NPI 1417907940, Palo Alto, CA); Alaska Native Tribal Health Consortium (NPI 1437189339, Anchorage, AK) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Washington School Of Medicine, class of 1984
## Record status
- **NPPES last updated:** March 21, 2024
- **Other identifiers:** Medicaid MD21813 (AK)
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Source: [NPI Profile](https://npiprofile.com/npi/1366466120) · Data from the CMS NPPES public registry.