KAREN YI MUELLER NP
NPI 1124321260
Nurse Practitioner in Stanford, CA
About Karen Yi Mueller Np NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
KAREN YI MUELLER NP (NPI 1124321260) is an individual nurse practitioner in Stanford, California, licensed in California (20081) and active in the NPI registry since December 2010. She is enrolled in Medicare PECOS and is a graduate of Other (2000).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 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
Karen Yi Mueller Np 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 Karen Mueller 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
Davis, CA 95616
- Reassigned Medicare billing, California enrollment
- 2,570 clinicians in this Medicare group
Salt Lake City, UT 84132
- Reassigned Medicare billing, Utah enrollment
- 338 clinicians in this Medicare group
Salt Lake City, UT 84132
- Reassigned Medicare billing, Utah enrollment
- 2,620 clinicians in this Medicare group
Salt Lake City, UT 84108
- Reassigned Medicare billing, Utah enrollment
- 65 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 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 Karen Mueller's NPI number?
The NPI number for Karen Mueller is 1124321260. It was assigned to this individual provider in the NPPES registry on December 13, 2010. The provider is also known as Ms. Karen Juan.
Where is Karen Mueller located?
Karen Mueller practices at 300 Pasteur Dr, Stanford, CA 94305. The listed phone number is (650) 723-4000.
What is Karen Mueller's specialty?
The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.
Is Karen Mueller enrolled in Medicare?
Yes. Karen Mueller 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 Karen Mueller's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Mueller reassigns Medicare benefits to 6 organizations: Stanford Health Care (Stanford, CA), Lpch Medical Group Div Of Lucile (Palo Alto, CA), Regents Of The Univ Of Ca (Davis, CA), University Of Utah Acuity Care Services (Salt Lake City, UT), University Of Utah Adult Services (Salt Lake City, UT) 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 Karen Mueller'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 Karen Mueller was last updated on April 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Karen Yi Mueller, NP · NPI 1124321260
Nurse Practitioner physician in Stanford, California. Individual provider, active in the CMS NPPES registry since December 13, 2010.
## Identity
- **NPI:** 1124321260 (Entity type: Individual)
- **Enumerated:** December 13, 2010
- **Primary specialty:** Nurse Practitioner · taxonomy 363L00000X
- **State license:** 20081 (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); Regents Of The Univ Of Ca (NPI 1053304071, Davis, CA); University Of Utah Acuity Care Services (NPI 1316341456, Salt Lake City, UT); University Of Utah Adult Services (NPI 1578967345, Salt Lake City, UT); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2000
## Record status
- **NPPES last updated:** April 7, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1124321260) · Data from the CMS NPPES public registry.