Gastroenterologists · Missouri · October 2026
Best Gastroenterologists in Missouri (October 2026)
Dr. Ruben Aymerich ranks first with a score of 88.6: 5.0 stars from 646 Google reviews; 30 years since medical school; accepts Medicare assignment. Dr. Jeffrey Mathews ranks second with a score of 87.9: 5.0 stars from 448 Google reviews; 38 years since medical school; accepts Medicare assignment. Dr. Richard Riegel ranks third with a score of 87.8: 5.0 stars from 440 Google reviews; 35 years since medical school; accepts Medicare assignment.
- 1
Ruben Aymerich, MD
5.0 out of 5 · 646 Google reviews
Score 88.6 · 30 years since medical school; accepts Medicare assignment
- 2
Jeffrey Mathews, MD
5.0 out of 5 · 448 Google reviews
Score 87.9 · 38 years since medical school; accepts Medicare assignment
- 3
Richard Riegel, MD
5.0 out of 5 · 440 Google reviews
Score 87.8 · 35 years since medical school; accepts Medicare assignment
- 4
Brian McMorrow, MD
5.0 out of 5 · 296 Google reviews
Score 86.7 · 34 years since medical school; accepts Medicare assignment
- 5
Joel Riley, MD
4.9 out of 5 · 1,266 Google reviews
Score 86.4 · 40 years since medical school; accepts Medicare assignment
- 6
Leonard Weinstock, MD
4.9 out of 5 · 624 Google reviews
Score 85.5 · 45 years since medical school; accepts Medicare assignment
- 7
Marc Taormina, MD
4.9 out of 5 · 547 Google reviews
Score 85.3 · 50 years since medical school; accepts Medicare assignment
- 8
Erik Thyssen, MD
4.9 out of 5 · 534 Google reviews
Score 85.3 · 42 years since medical school; accepts Medicare assignment
- 9
Thomas Jones, MD
4.9 out of 5 · 330 Google reviews
Score 84.2 · 38 years since medical school; accepts Medicare assignment
- 10
Fred Williams, MD
5.0 out of 5 · 148 Google reviews
Score 83.9 · 40 years since medical school; accepts Medicare assignment
The same list as a table
| Rank | Doctor | City | Score | Rating | Reviews | Years |
|---|---|---|---|---|---|---|
| 1 | Ruben Aymerich, MD | St. Louis | 88.6 | 5.0 | 646 | 30 |
| 2 | Jeffrey Mathews, MD | Chesterfield | 87.9 | 5.0 | 448 | 38 |
| 3 | Richard Riegel, MD | Chesterfield | 87.8 | 5.0 | 440 | 35 |
| 4 | Brian McMorrow, MD | Chesterfield | 86.7 | 5.0 | 296 | 34 |
| 5 | Joel Riley, MD | St. Louis | 86.4 | 4.9 | 1,266 | 40 |
| 6 | Leonard Weinstock, MD | Creve Coeur | 85.5 | 4.9 | 624 | 45 |
| 7 | Marc Taormina, MD | Lees Summit | 85.3 | 4.9 | 547 | 50 |
| 8 | Erik Thyssen, MD | Creve Coeur | 85.3 | 4.9 | 534 | 42 |
| 9 | Thomas Jones, MD | Liberty | 84.2 | 4.9 | 330 | 38 |
| 10 | Fred Williams, MD | Chesterfield | 83.9 | 5.0 | 148 | 40 |
How we ranked
Ratings are weighted toward independent, third-party verified patient reviews. When a physician has them, 60% of the rating comes from patients surveyed by an independent third party (not chosen by the practice) and 40% from public, anonymous reviews such as Google. Anonymous reviews alone count for less, so a few posts can't carry a physician to the top. The score also weighs years since medical school and accepting Medicare assignment. Every physician here has a verified practice website and at least five patient reviews. No one can pay to change a rank. Read the full method.
Questions
Who is the highest-ranked gastroenterologist in Missouri?
Ruben Aymerich, MD in St. Louis, with a BestDocs score of 88.6 (5.0 stars from 646 Google reviews; 30 years since medical school; accepts Medicare assignment).
How many gastroenterologists in Missouri have online booking?
41 of the 83 ranked gastroenterologists in Missouri offer online booking on their practice website.
How are these gastroenterologists ranked?
By the BestDocs score, which is weighted toward independent third-party verified patient reviews: patient rating (50 points; 60% independent verified reviews and 40% anonymous public reviews when both exist), years in practice (31.25) and verified credentials (18.75). Sponsored placements never change rank. The full method is on the methodology page.
Data as of October 2026. Sources: CMS NPPES, CMS Doctors and Clinicians file, Google business listings, practice websites. Ratings are Google ratings, shown as text and not marked up as reviews.