Ryan T. Callahan, DPM
Podiatrists (Podiatrist)
At a glance
- In the NPI registry since
- 2021
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. What an NPI is
Education and training
- 2021Registered with an NPI (national billing number; not a license date)
Medicare’s Care Compare data doesn’t list this clinician’s medical school. Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Podiatrist primary
CA license E6042
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Payments from drug and device companies
In 2025, 2 companies reported 4 payments worth $1,412 in total to this clinician.
| Stryker Corporation | $1,396 |
|---|---|
| Bioventus LLC | $15.32 |
| Travel and Lodging | $1,353 |
|---|---|
| Food and Beverage | $58.99 |
What the payments were for
| Company | What it was for | Amount |
|---|---|---|
| Stryker Corporation Sep 25, 2025 | Travel and Lodging INFINITY ADAPTIS · TRAUMA & EXTREMITIES · travel to ATLANTA, GA | $1,353 |
Each payment as the company reported it, with the products it named. Meals are counted in the totals above but not listed one by one.
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.