DR. KATHLEEN MARY OBRIEN MD
NPI 1427236975
Emergency Medicine in Reno, NV
About Dr. Kathleen Mary Obrien Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. KATHLEEN MARY OBRIEN MD (NPI 1427236975) is an individual emergency medicine provider in Reno, Nevada, licensed in California (A134513) and active in the NPI registry since February 2008. She is enrolled in Medicare PECOS, is affiliated with Carson Tahoe Regional Medical Center, and maintains a secondary practice location in Boston.
NPPES Registry Identity
Specialties & Licenses
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
Dr. Kathleen Mary Obrien 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
4Medicare enrollment records show Kathleen Obrien reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Carson City, NV 89703
- Reassigned Medicare billing, Nevada enrollment
- 24 clinicians in this Medicare group
Truckee, CA 96161
- Reassigned Medicare billing, California enrollment
- 131 clinicians in this Medicare group
Truckee, CA 96161
- Reassigned Medicare billing, California enrollment
- 2,323 clinicians in this Medicare group
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 20,078 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 4
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Carson Tahoe Regional Medical Center
Acute Care Hospitals · Carson City, NVPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 89509 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Kathleen Obrien's NPI number?
The NPI number for Kathleen Obrien is 1427236975. It was assigned to this individual provider in the NPPES registry on February 7, 2008.
Where is Kathleen Obrien located?
Kathleen Obrien practices at 550 W Plumb Ln # B245, Reno, NV 89509. The listed phone number is (508) 769-3310.
What is Kathleen Obrien's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Kathleen Obrien enrolled in Medicare?
Yes. Kathleen Obrien 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 Kathleen Obrien's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Kathleen Obrien reassigns Medicare benefits to 4 organizations: Carson Tahoe Emergency Physicians (Carson City, NV), California Emergency Physicians Medical Group, A Professional Corp (Truckee, CA), Cep America - California (Truckee, CA) and Permanente Medical Group Inc (Stockton, 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 Kathleen Obrien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Kathleen Obrien affiliated with any hospitals?
According to CMS data, Kathleen Obrien is affiliated with Carson Tahoe Regional Medical Center.
When was this NPI record last updated?
The NPPES record for Kathleen Obrien was last updated on February 25, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.
# Dr. Kathleen Mary Obrien, MD · NPI 1427236975
Emergency Medicine physician in Reno, Nevada. Individual provider, active in the CMS NPPES registry since February 7, 2008.
## Identity
- **NPI:** 1427236975 (Entity type: Individual)
- **Enumerated:** February 7, 2008
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A134513 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 550 W PLUMB LN # B245, Reno, NV 89509-3468
- **Phone:** (508) 769-3310
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Carson Tahoe Emergency Physicians (NPI 1396822821, Carson City, NV); California Emergency Physicians Medical Group, A Professional Corp (NPI 1215365218, Truckee, CA); Cep America - California (NPI 1336492446, Truckee, CA); Permanente Medical Group Inc (NPI 1548343510, Stockton, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Massachusetts Medical School, class of 2006
## Record status
- **NPPES last updated:** February 25, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1427236975) · Data from the CMS NPPES public registry.