Simon Maltais, MD
Cardiac Surgery · Thoracic Surgery (CMS) · Thousand Oaks, CA
At a glance
227 W Janss Rd Ste 340, Thousand Oaks, CA 91360-1879
Published activity: Coronary artery bypass graft (CABG) · Removal of tissue. View counts and coverage
NPPES record updated May 20, 2025. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
227 W Janss Rd Ste 340Thousand Oaks, CA 91360-1879
Additional reported practice locations
1000 N Oak AveMarshfield, WI 544495703
Phone: 7153875511
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2003
- CMS specialties
- Cardiac Surgery · Thoracic Surgery
CMS reports telehealth services for this clinician. Confirm current services and availability with the practice.
Practice groups
Reported hospital affiliations
- Benefis Hospitals Inc Great Falls, MT
- Great Falls Clinic Hospital Great Falls, MT
- Marshfield Medical Center - Weston Weston, WI
- Northern Montana Hospital Havre, MT
- St James Hospital Butte, MT
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Coronary artery bypass graft (CABG) | 39 |
| Removal of tissue | 1-10 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $2,411.08 |
Reporting companies
| Company | Amount |
|---|---|
| ABIOMED | $1,273.99 |
| LEMAITRE VASCULAR, INC. | $338.32 |
| KLS-MARTIN L.P. | $223.17 |
| ABBOTT LABORATORIES | $177.29 |
| W. L. GORE & ASSOCIATES, INC. | $146.40 |
| SHOCKWAVE MEDICAL, INC | $133.82 |
| BAXTER HEALTHCARE | $77.90 |
| E.R. SQUIBB & SONS, L.L.C. | $25.38 |
| Other reporting companies | $14.81 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Cardiac Surgery · Thoracic Surgery (CMS)
- Taxonomy code
- 208G00000X
- Enumeration date
- Jul 27, 2010
- Record updated
- May 20, 2025
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
2086S0129X
License reported: MD47528 TN
208G00000X
License reported: 65433 WI
208G00000X
License reported: MD47528 TN
208G00000X · Primary
License reported: 53401 MN
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
227 W Janss Rd Ste 340Thousand Oaks, CA 91360-1879
- Phone
- (805) 852-9100
- Fax
- (805) 852-9101
Mailing address
227 W JANSS RD STE 340THOUSAND OAKS, CA 913601879
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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