Quick answers
- Where does Jonathan D. Claassen see patients?
- Medicare's clinician data lists 1 practice location in Thornton, CO. Call before your visit to confirm the address.
- What is Jonathan D. Claassen's specialty?
- Medicare lists Preventive Medicine as the primary specialty.
- Does Jonathan D. Claassen accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan D. Claassen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Jonathan D. Claassen?
- (303) 287-7070, as listed in official Medicare / NPI Registry data.
- What is Jonathan D. Claassen's NPI number?
- 1679709398. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Jonathan D. Claassen is enrolled with Medicare (CMS data updated 2026-10-02).
- 500 E 84th Ave, Suite B14Thornton, CO 80229 (303) 287‑7070
Group practices
Medicare enrollment lists Jonathan D. Claassen as a member of this group (CMS data updated 2026-10-02).
- American Current Care PA550 clinicians in the group
Specialties
- Preventive Medicineprimary
Other preventive medicine doctors in Colorado
Clinicians with the same Medicare primary specialty in Colorado — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Kansas City University Of Med & Biosciences, College Of Osteo Med |
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1679709398 |
| Corrections | Report an error or suggest an update → |
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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians