Marissa A. Lewis, MD

Medicare activity in 2024

Official CMS public-use data for Marissa A. Lewis, 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. Measurement of brain wave activity (eeg), awake and drowsy (95816)1,126 services
2. Exam of neurobehavioral status, first hour (96116)1,122 services
3. Biofeedback training (90901)1,120 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)1,108 services
5. Emergency department visit with high level of medical decision making (99285)243 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%
• Arthritis55%
• Anxiety50%
• Chronic kidney disease49%
• Depression48%

Hospitals where Marissa A. Lewis works

Medicare's Facility Affiliation Data lists Marissa A. Lewis 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.

• Mercy Hospital SouthSaint Louis, MO · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 260077
• SSM Health Depaul Hospital St LouisBridgeton, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260104

Practice locations

Addresses where Marissa A. Lewis is enrolled with Medicare (CMS data updated October 2, 2026).

• 10010 Kennerly RdSaint Louis, MO 63128 (314) 525‑1906
• 12303 De Paul DrBridgeton, MO 63044 (314) 344‑6000

Group practices

Medicare enrollment lists Marissa A. Lewis as a member of these groups (CMS data updated October 2, 2026).

• Cep America LLC1,023 clinicians in the group
• Mercy Hospital South49 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in Missouri →

Other emergency medicine doctors in Saint Louis

Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.

• Opeolu Adeoye, MD
• Peter D. Panagos, MD
• Edward L. Fieg, DO
• Randall S. Jotte, MD
• Genevieve S. Pentecost, MD
• Scott J. Kilian, MD
• Laurie E. Byrne, MD
• Frank T. Dicker, MD

All emergency medicine doctors in Saint Louis →

Other clinicians in Cep America LLC

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

• Payal S. Patel, MD
• Michael Vickery, DO
• Neil Sreshta, MD
• Anna Harned, MD
• Matthew Macias, MD
• Scott M. Russo, DO

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