SANNA ELIZABETH HERWALD MD
NPI 1710449111
Radiology - Vascular & Interventional Radiology in Stanford, CA
About Sanna Elizabeth Herwald Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SANNA ELIZABETH HERWALD MD (NPI 1710449111) is an individual vascular & interventional radiology provider in Stanford, California, licensed in California (A181552) and active in the NPI registry since April 2019. She is enrolled in Medicare PECOS, is affiliated with Unitypoint Health - Meriter, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 2
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
Sanna Elizabeth Herwald 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
6Medicare enrollment records show Sanna Herwald reassigns Medicare billing to 6 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
Richland Center, WI 53581
- Reassigned Medicare billing, Wisconsin enrollment
- 109 clinicians in this Medicare group
Middleton, WI 53562
- Reassigned Medicare billing, Wisconsin enrollment
- 2,832 clinicians in this Medicare group
Wausau, WI 54401
- Reassigned Medicare billing, Wisconsin enrollment
- 206 clinicians in this Medicare group
Fort Atkinson, WI 53538
- Reassigned Medicare billing, Wisconsin enrollment
- 298 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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Unitypoint Health - Meriter
Acute Care Hospitals · Madison, WIUniversity Of Wi Hospitals & Clinics Authority
Acute Care Hospitals · Madison, WIPhysician 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.
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 Sanna Herwald's NPI number?
The NPI number for Sanna Herwald is 1710449111. It was assigned to this individual provider in the NPPES registry on April 3, 2019.
Where is Sanna Herwald located?
Sanna Herwald practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Sanna Herwald's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Vascular & Interventional Radiology, with taxonomy code 2085R0204X.
Is Sanna Herwald enrolled in Medicare?
Yes. Sanna Herwald 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 Sanna Herwald's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sanna Herwald reassigns Medicare benefits to 6 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA), Richland Hospital (Richland Center, WI), University Of Wisconsin Medical Foundation, Inc (Middleton, WI), University Of Wisconsin System Non Payroll (Wausau, WI) and 1 more organization, listed in the Medicare section above. 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 Sanna Herwald's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Sanna Herwald accept?
Health plans from Quartz list Sanna Herwald 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.
Is Sanna Herwald affiliated with any hospitals?
According to CMS data, Sanna Herwald is affiliated with Unitypoint Health - Meriter and University Of Wi Hospitals & Clinics Authority.
When was this NPI record last updated?
The NPPES record for Sanna Herwald was last updated on September 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.
# Sanna Elizabeth Herwald, MD · NPI 1710449111
Vascular & Interventional Radiology physician in Stanford, California. Individual provider, active in the CMS NPPES registry since April 3, 2019.
## Identity
- **NPI:** 1710449111 (Entity type: Individual)
- **Enumerated:** April 3, 2019
- **Primary specialty:** Radiology - Vascular & Interventional Radiology · taxonomy 2085R0204X
- **State license:** A181552 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 PASTEUR DR, Stanford, CA 94305-2200
- **Phone:** (650) 723-4000
## 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:** 6 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); Richland Hospital (NPI 1659301273, Richland Center, WI); University Of Wisconsin Medical Foundation, Inc (NPI 1598784555, Middleton, WI); University Of Wisconsin System Non Payroll (NPI 1487978839, Wausau, WI); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tufts University School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** September 29, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1710449111) · Data from the CMS NPPES public registry.