KRISTEN ELIZABETH MENGWASSER
NPI 1841828720
Internal Medicine - Rheumatology in San Francisco, CA
About Kristen Elizabeth Mengwasser NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KRISTEN ELIZABETH MENGWASSER (NPI 1841828720) is an individual rheumatology provider in San Francisco, California, licensed in California (A180354) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Harvard Medical School (2020).
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
Kristen Elizabeth Mengwasser 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
5Medicare enrollment records show Kristen Mengwasser reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 1,573 clinicians in this Medicare group
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 637 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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 94110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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 Kristen Mengwasser's NPI number?
The NPI number for Kristen Mengwasser is 1841828720. It was assigned to this individual provider in the NPPES registry on March 27, 2020.
Where is Kristen Mengwasser located?
Kristen Mengwasser practices at 1001 Potrero Avenue Bldg 90 Fl2, San Francisco, CA 94110. The listed phone number is (628) 206-4777.
What is Kristen Mengwasser's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Kristen Mengwasser enrolled in Medicare?
Yes. Kristen Mengwasser 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 Kristen Mengwasser's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kristen Mengwasser reassigns Medicare benefits to 5 organizations: City & County Of San Francisco (San Francisco, CA), University Of California Sfgh Medical Group (San Francisco, CA), Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (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 Kristen Mengwasser'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 Kristen Mengwasser was last updated on April 7, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Kristen Elizabeth Mengwasser · NPI 1841828720
Rheumatology physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1841828720 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** A180354 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1001 POTRERO AVENUE BLDG 90 FL2, San Francisco, CA 94110
- **Phone:** (628) 206-4777 · **Fax:** (628) 206-4257
## 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:** 5 organizations under Medicare reassignment (form CMS-855R): City & County Of San Francisco (NPI 1083648810, San Francisco, CA); University Of California Sfgh Medical Group (NPI 1073836060, San Francisco, CA); Regents Of The University Of California (NPI 1235322348, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Harvard Medical School, class of 2020
## Record status
- **NPPES last updated:** April 7, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1841828720) · Data from the CMS NPPES public registry.