CASSIDY SIEGEL MELLIN
NPI 1093211757
Pediatrics in San Francisco, CA
About Cassidy Siegel Mellin NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
CASSIDY SIEGEL MELLIN (NPI 1093211757) is an individual pediatrics provider in San Francisco, California, licensed in California (A164601) and active in the NPI registry since April 2018. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses 2
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Cassidy Siegel Mellin is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Cassidy Mellin reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 clinicians in this Medicare group
Los Angeles, CA 90022
- Reassigned Medicare billing, California enrollment
- 45 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94143 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
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 Cassidy Mellin's NPI number?
The NPI number for Cassidy Mellin is 1093211757. It was assigned to this individual provider in the NPPES registry on April 2, 2018.
Where is Cassidy Mellin located?
Cassidy Mellin practices at 1975 4th St, San Francisco, CA 94143. The listed phone number is (415) 476-9000.
What is Cassidy Mellin's specialty?
The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.
Is Cassidy Mellin enrolled in Medicare?
Yes. Cassidy Mellin is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Cassidy Mellin's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Cassidy Mellin reassigns Medicare benefits to 2 organizations: Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA) and Via Care Community Health Center (Los Angeles, 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 Cassidy Mellin'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 Cassidy Mellin was last updated on July 18, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Cassidy Siegel Mellin · NPI 1093211757
Pediatrics physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since April 2, 2018.
## Identity
- **NPI:** 1093211757 (Entity type: Individual)
- **Enumerated:** April 2, 2018
- **Primary specialty:** Pediatrics · taxonomy 208000000X
- **State license:** A164601 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1975 4TH ST, San Francisco, CA 94143-2351
- **Phone:** (415) 476-9000
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **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): Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA); Via Care Community Health Center (NPI 1730630997, Los Angeles, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 18, 2022
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Source: [NPI Profile](https://npiprofile.com/npi/1093211757) · Data from the CMS NPPES public registry.