MS. RACHEL S KRELLENSTEIN
NPI 1245465236
Counselor - Mental Health in San Mateo, CA
About Ms. Rachel S Krellenstein NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. RACHEL S KRELLENSTEIN (NPI 1245465236) is an individual mental health provider in San Mateo, California and active in the NPI registry since May 2009. She is enrolled in Medicare PECOS and is a graduate of Other (2010).
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 and accepts Medicare assignment
Ms. Rachel S Krellenstein 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 Reassignment
Medicare enrollment records show Rachel Krellenstein reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94102
- Reassigned Medicare billing, California enrollment
- 6 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
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.
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.
SAN MATEO, CA 94402
SAN MATEO, CA 94402
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 Rachel Krellenstein's NPI number?
The NPI number for Rachel Krellenstein is 1245465236. It was assigned to this individual provider in the NPPES registry on May 20, 2009.
Where is Rachel Krellenstein located?
Rachel Krellenstein practices at 1108 S El Camino Real, San Mateo, CA 94402. The listed phone number is (650) 458-0026.
What is Rachel Krellenstein's specialty?
The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.
Is Rachel Krellenstein enrolled in Medicare?
Yes. Rachel Krellenstein 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 organization bills Medicare for Rachel Krellenstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Rachel Krellenstein reassigns Medicare benefits to Access Institute For Psychological Services (San Francisco, CA). The 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 Rachel Krellenstein'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 Rachel Krellenstein was last updated on December 22, 2014. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.
# Ms. Rachel S Krellenstein · NPI 1245465236
Mental Health provider in San Mateo, California. Individual provider, active in the CMS NPPES registry since May 20, 2009.
## Identity
- **NPI:** 1245465236 (Entity type: Individual)
- **Enumerated:** May 20, 2009
- **Primary specialty:** Counselor - Mental Health · taxonomy 101YM0800X
- **Sole proprietor:** No
## Practice location
- **Address:** 1108 S EL CAMINO REAL, San Mateo, CA 94402-2804
- **Phone:** (650) 458-0026 · **Fax:** (650) 458-0027
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Access Institute For Psychological Services (NPI 1609919109, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2010
## Record status
- **NPPES last updated:** December 22, 2014
---
Source: [NPI Profile](https://npiprofile.com/npi/1245465236) · Data from the CMS NPPES public registry.