MAUREEN ANNE MCMAHON MD
NPI 1285655852
Internal Medicine - Rheumatology in Los Angeles, CA
About Maureen Anne Mcmahon Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAUREEN ANNE MCMAHON MD (NPI 1285655852) is an individual rheumatology provider in Los Angeles, California, licensed in California (A75412) and active in the NPI registry since July 2006. She is enrolled in Medicare PECOS and is a graduate of University Of Chicago, Pritzker School Of Medicine (1997).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 3
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
Maureen Anne Mcmahon 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 Reassignment
Medicare enrollment records show Maureen Mcmahon reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90095
- Reassigned Medicare billing, California enrollment
- 1,766 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 3
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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90095 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.
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.
LOS ANGELES, CA 90095
LOS ANGELES, CA 90095
LOS ANGELES, CA 90095
LOS ANGELES, CA 90095
LOS ANGELES, CA 90095
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 Maureen Mcmahon's NPI number?
The NPI number for Maureen Mcmahon is 1285655852. It was assigned to this individual provider in the NPPES registry on July 21, 2006.
Where is Maureen Mcmahon located?
Maureen Mcmahon practices at 200 Medical Plaza #365,530,420,120, Los Angeles, CA 90095. The listed phone number is (310) 825-6301.
What is Maureen Mcmahon's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.
Is Maureen Mcmahon enrolled in Medicare?
Yes. Maureen Mcmahon 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 Maureen Mcmahon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maureen Mcmahon reassigns Medicare benefits to The Regents Of The University Of California (Los Angeles, 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 Maureen Mcmahon'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 Maureen Mcmahon was last updated on July 13, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.
# Maureen Anne Mcmahon, MD · NPI 1285655852
Rheumatology physician in Los Angeles, California. Individual provider, active in the CMS NPPES registry since July 21, 2006.
## Identity
- **NPI:** 1285655852 (Entity type: Individual)
- **Enumerated:** July 21, 2006
- **Primary specialty:** Internal Medicine - Rheumatology · taxonomy 207RR0500X
- **State license:** A75412 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 200 MEDICAL PLAZA, #365,530,420,120, Los Angeles, CA 90095
- **Phone:** (310) 825-6301
## 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:** The Regents Of The University Of California (NPI 1235107566, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Chicago, Pritzker School Of Medicine, class of 1997
## Record status
- **NPPES last updated:** July 13, 2010
- **Other identifiers:** Medicare UPIN H23747 (CA); Medicaid 00A754120 (CA); Medicare PIN WA75412A (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1285655852) · Data from the CMS NPPES public registry.