Maureen Mcmahon, MD
NPI 1285655852 · Rheumatology Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Maureen Mcmahon, MD is a Rheumatology Physician provider in Los Angeles, CA (NPI 1285655852).
Provider details
- NPI number
- 1285655852
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A75412 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
91 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 38 | $68 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 29 | $99 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 24 | $98 |
Typical Medicare-allowed amounts for these services range $68–$99 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 102 | 20 |
| Hydroxychloroquine Sulfate | 80 | 22 |
| Methotrexate Sodiumbrand: Methotrexate | 41 | 11 |
| Etanerceptbrand: Enbrel Sureclick | 40 | — |
| Hydrocodone/Acetaminophenbrand: Hydrocodone-Acetaminophen | 30 | — |
| Gabapentin | 28 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$46,882 across 33 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-21
- Last updated
- 2010-07-13
Frequently asked questions
- What is Maureen Mcmahon's NPI number?
- Maureen Mcmahon's National Provider Identifier (NPI) is 1285655852, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Maureen Mcmahon's specialty?
- Maureen Mcmahon is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Maureen Mcmahon located?
- Maureen Mcmahon's practice location on file with NPPES is 200 Medical Plaza, Los Angeles, CA 90095.
- What is Maureen Mcmahon's phone number?
- The practice phone number listed in the NPPES registry for Maureen Mcmahon is (310) 825-6301.
- Does Maureen Mcmahon accept Medicare?
- Maureen Mcmahon is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Maureen Mcmahon's NPI active?
- Yes — Maureen Mcmahon's NPI (1285655852) is active in the NPPES registry as of the last update on 2010-07-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.