Mark A. St. Cyr, MD
Internal Medicine (CMS) · Lafayette, LA
At a glance
2100 Jefferson St, Lafayette, LA 70501-8556
NPPES record updated Apr 15, 2008. 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
2100 Jefferson StLafayette, LA 70501-8556
Education & affiliations
- Medical / professional school
- Louisiana State University School Of Medicine In Shreveport
- Graduation year
- 1986
- CMS specialties
- Internal Medicine
Practice groups
Reported hospital affiliations
- Acadia St Landry Church Point, LA
- Avoyelles Hospital Marksville, LA
- Christus Coushatta Health Care Center Coushatta, LA
- Claiborne Memorial Medical Center Homer, LA
- East Carroll Parish Hospital Lake Providence, LA
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.
No displayed procedure-category record in this release. This does not mean the clinician performs no procedures.
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
No matching general-payment summary in the imported release. This is not a verified zero and does not rule out other payment types or years.
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
- Internal Medicine (CMS)
- Taxonomy code
- 207PE0004X
- Enumeration date
- May 19, 2006
- Record updated
- Apr 15, 2008
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- MD
Reported taxonomies and licenses
207PE0004X · Primary
License reported: 018991 LA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
2100 Jefferson StLafayette, LA 70501-8556
- Phone
- (337) 261-0734
Mailing address
2100 JEFFERSON STLAFAYETTE, LA 705018556
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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