Quick answers
- Where does John E. Grootendorst see patients?
- Medicare's clinician data lists 1 practice location in Madera, CA. Call before your visit to confirm the address.
- What is John E. Grootendorst's specialty?
- Medicare lists Chiropractic as the primary specialty.
- Does John E. Grootendorst accept Medicare assignment?
- Yes. Medicare's clinician data says John E. Grootendorst 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 John E. Grootendorst?
- (559) 674-8892, as listed in official Medicare / NPI Registry data.
- What is John E. Grootendorst's NPI number?
- 1780765073. 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 John E. Grootendorst is enrolled with Medicare (CMS data updated 2026-10-02).
- 900 W Yosemite AveMadera, CA 93637 (559) 674‑8892
Group practices
Medicare enrollment lists John E. Grootendorst as a member of this group (CMS data updated 2026-10-02).
- Grootendorst Chiropractic Professional Corporation2 clinicians in the group
Specialties
- Chiropracticprimary
Other chiropractors in Madera
Clinicians with the same Medicare primary specialty in Madera, CA — not a recommendation.
Clinician information
| Credential | CH |
|---|---|
| Medical school | Life Chiropractic College |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1780765073 |
| 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