DR. CATHERINE ALEXANDER MAHLER
NPI 1184770240
Psychologist - Clinical in Sonoma, CA
About Dr. Catherine Alexander Mahler NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CATHERINE ALEXANDER MAHLER (NPI 1184770240) is an individual clinical provider in Sonoma, California, licensed in California (PSY 24349) and active in the NPI registry since January 2007. She is enrolled in Medicare PECOS and maintains a secondary practice location in Sonoma.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Catherine Alexander Mahler is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Catherine Mahler reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Napa, CA 94558
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: County Of Napa
- 39 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 95476 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 2
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 Catherine Mahler's NPI number?
The NPI number for Catherine Mahler is 1184770240. It was assigned to this individual provider in the NPPES registry on January 25, 2007.
Where is Catherine Mahler located?
Catherine Mahler practices at 620 Broadway, Sonoma, CA 95476. The listed phone number is (707) 815-3622.
What is Catherine Mahler's specialty?
The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.
Is Catherine Mahler enrolled in Medicare?
Yes. Catherine Mahler is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Catherine Mahler's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Mahler reassigns Medicare benefits to Napa County (Napa, 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 Catherine Mahler'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 Catherine Mahler was last updated on March 17, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Dr. Catherine Alexander Mahler · NPI 1184770240
Clinical provider in Sonoma, California. Individual provider, active in the CMS NPPES registry since January 25, 2007.
## Identity
- **NPI:** 1184770240 (Entity type: Individual)
- **Enumerated:** January 25, 2007
- **Primary specialty:** Psychologist - Clinical · taxonomy 103TC0700X
- **State license:** PSY 24349 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 620 BROADWAY, Sonoma, CA 95476-7002
- **Phone:** (707) 815-3622
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Napa County (NPI 1467507699, Napa, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 17, 2018
- **Other identifiers:** Medicaid 4605 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1184770240) · Data from the CMS NPPES public registry.