Alexandra G. St. Louis, MD

Medicare activity in 2024

Official CMS public-use data for Alexandra G. St. Louis, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)176 services
2. Insertion of needle into vein for collection of blood sample (36415)63 services
3. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)53 services
4. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (93000)32 services
5. Administration of influenza virus vaccine (G0008)29 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure75%
• High cholesterol75%
• Arthritis49%
• Anxiety27%
• Ischemic heart disease26%
• Diabetes24%

Hospitals where Alexandra G. St. Louis works

Medicare's Facility Affiliation Data lists Alexandra G. St. Louis at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Good Samaritan Hospital Medical CenterWest Islip, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330286
• Mercy Medical CenterRockville Centre, NY · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 330259

Practice locations

Addresses where Alexandra G. St. Louis is enrolled with Medicare (CMS data updated October 2, 2026).

• 100 Port Washington BlvdRoslyn, NY 11576
• 1000 N Village AveRockville Center, NY 11570

Group practices

Medicare enrollment lists Alexandra G. St. Louis as a member of this group (CMS data updated October 2, 2026).

• CHS Physician Partners PC743 clinicians in the group

Specialties

• Family Practiceprimary

Find other Family Practice doctors in New York →

Other family doctors in Roslyn

Clinicians with the same Medicare primary specialty in Roslyn, NY — not a recommendation.

• Mary Korpacz Fink, DO
• John D. Bedell Iii, DO
• Kevin Reiter, MD
• Louis F. Loiodice, MD
• Stephen M. Burke, MD
• Joy H. Curran, DO
• Sean J. Keller, MD
• Andrea B. Kaplan, MD

All family doctors in Roslyn →

Other clinicians in CHS Physician Partners PC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Kristen Lorch, NP
• Jillian M. Oswald, NP
• Michele L. Becker-Hamou, MD
• Shannon M. Munday, NP
• Jeffrey W. Moses, MD
• Loretta George, NP

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians