Simon Maltais, MD
NPI 1457665911 · Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Thousand Oaks, CA
Enrolled with Medicare as Practitioner - Cardiac Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Simon Maltais, MD is a Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician provider in Thousand Oaks, CA (NPI 1457665911).
Provider details
- NPI number
- 1457665911
- Entity type
- Individual
- Primary specialty
- Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- MD47528 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
15 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
29 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) |
|---|---|---|
| Coronary Artery Bypass Using Artery Graft, 1 Graft33533 | 18 | $1,470 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 11 | $167 |
Typical Medicare-allowed amounts for these services range $167–$1,470 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$6,997 across 21 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
Additional practice locations (1)
- 1000 N Oak AveMarshfield, WI 54449-5703Phone: (715) 387-5511
Registry dates
- Enumerated
- 2010-07-27
- Last updated
- 2025-05-20
- Certified
- 2025-05-20
Frequently asked questions
- What is Simon Maltais's NPI number?
- Simon Maltais's National Provider Identifier (NPI) is 1457665911, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Simon Maltais's specialty?
- Simon Maltais is listed in the NPPES registry with a primary specialty of Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (Allopathic & Osteopathic Physicians).
- Where is Simon Maltais located?
- Simon Maltais's practice location on file with NPPES is 227 W Janss Rd Ste 340, Thousand Oaks, CA 91360-1879.
- What is Simon Maltais's phone number?
- The practice phone number listed in the NPPES registry for Simon Maltais is (805) 852-9100.
- Does Simon Maltais accept Medicare?
- Simon Maltais is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Simon Maltais's NPI active?
- Yes — Simon Maltais's NPI (1457665911) is active in the NPPES registry as of the last update on 2025-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.