Dermatologists · Cedar Rapids, IA · October 2026
Best Dermatologists in Cedar Rapids, IA (October 2026)
Dr. John Wollner ranks first with a score of 78.9: 4.8 stars from 75 Google reviews; 48 years since medical school; accepts Medicare assignment. Dr. Ashlynne Clark ranks second with a score of 74.1: 5.0 stars from 486 Google reviews; 16 years since medical school; accepts Medicare assignment. Dr. Thomas Pietras ranks third with a score of 72.9: 4.9 stars from 980 Google reviews; 17 years since medical school; accepts Medicare assignment.
- 1
John Wollner, MD
4.8 out of 5 · 75 Google reviews
Score 78.9 · 48 years since medical school; accepts Medicare assignment
- 2
Ashlynne Clark, MD
5.0 out of 5 · 486 Google reviews
Score 74.1 · 16 years since medical school; accepts Medicare assignment
- 3
Thomas Pietras, MD
4.9 out of 5 · 980 Google reviews
Score 72.9 · 17 years since medical school; accepts Medicare assignment
- 4
David Knutson, MD
4.2 out of 5 · 19 Google reviews
Score 70.5 · 31 years since medical school; accepts Medicare assignment
- 5
Matthew Landherr, MD
5.0 out of 5 · 339 Google reviews
Score 70.2 · 13 years since medical school; accepts Medicare assignment
- 6
Paul Fenton, MD
4.9 out of 5 · 513 Google reviews
Score 64.9 · 10 years since medical school; accepts Medicare assignment
The same list as a table
| Rank | Doctor | City | Score | Rating | Reviews | Years |
|---|---|---|---|---|---|---|
| 1 | John Wollner, MD | Cedar Rapids | 78.9 | 4.8 | 75 | 48 |
| 2 | Ashlynne Clark, MD | Cedar Rapids | 74.1 | 5.0 | 486 | 16 |
| 3 | Thomas Pietras, MD | Cedar Rapids | 72.9 | 4.9 | 980 | 17 |
| 4 | David Knutson, MD | Cedar Rapids | 70.5 | 4.2 | 19 | 31 |
| 5 | Matthew Landherr, MD | Cedar Rapids | 70.2 | 5.0 | 339 | 13 |
| 6 | Paul Fenton, MD | Cedar Rapids | 64.9 | 4.9 | 513 | 10 |
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 dermatologist in Cedar Rapids, IA?
John Wollner, MD in Cedar Rapids, with a BestDocs score of 78.9 (4.8 stars from 75 Google reviews; 48 years since medical school; accepts Medicare assignment).
How many dermatologists in Cedar Rapids, IA have online booking?
4 of the 6 ranked dermatologists in Cedar Rapids, IA offer online booking on their practice website.
How are these dermatologists 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.