ELLEN HADDOCK MD
NPI 1851823454
Dermatology in Fremont, CA
About Ellen Haddock Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN HADDOCK MD (NPI 1851823454) is an individual dermatology provider in Fremont, California, licensed in California (A157683) and active in the NPI registry since April 2017. She is enrolled in Medicare PECOS, maintains a secondary practice location in San Rafael, and is a graduate of University Of California, San Diego School Of Medicine (2017).
NPPES Registry Identity
Specialties & Licenses 2
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
Ellen Haddock 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
2Medicare enrollment records show Ellen Haddock reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
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
- 339 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 94538 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.
FREMONT, CA 94538
FREMONT, CA 94538
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 Ellen Haddock's NPI number?
The NPI number for Ellen Haddock is 1851823454. It was assigned to this individual provider in the NPPES registry on April 1, 2017.
Where is Ellen Haddock located?
Ellen Haddock practices at 3200 Kearney St, Fremont, CA 94538. The listed phone number is (510) 498-2374.
What is Ellen Haddock's specialty?
The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.
Is Ellen Haddock enrolled in Medicare?
Yes. Ellen Haddock 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 Ellen Haddock's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Haddock reassigns Medicare benefits to 2 organizations: Sutter Bay Medical Foundation (Palo Alto, CA) and Regents Univ Of California Ucsf (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 Ellen Haddock'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 Ellen Haddock was last updated on November 18, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 23 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.
# Ellen Haddock, MD · NPI 1851823454
Dermatology physician in Fremont, California. Individual provider, active in the CMS NPPES registry since April 1, 2017.
## Identity
- **NPI:** 1851823454 (Entity type: Individual)
- **Enumerated:** April 1, 2017
- **Primary specialty:** Dermatology · taxonomy 207N00000X
- **State license:** A157683 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3200 KEARNEY ST, Fremont, CA 94538-2299
- **Phone:** (510) 498-2374
## 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): Sutter Bay Medical Foundation (NPI 1013950807, Palo Alto, CA); Regents Univ Of California Ucsf (NPI 1124439807, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Diego School Of Medicine, class of 2017
## Record status
- **NPPES last updated:** November 18, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1851823454) · Data from the CMS NPPES public registry.