Quick answers
- Where does Gregory J. Shirk see patients?
- Medicare's clinician data lists 1 practice location in Mason City, IA. Call before your visit to confirm the address.
- What is Gregory J. Shirk's specialty?
- Medicare lists Chiropractic as the primary specialty.
- Does Gregory J. Shirk accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory J. Shirk 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 Gregory J. Shirk?
- (641) 423-4455, as listed in official Medicare / NPI Registry data.
- What is Gregory J. Shirk's NPI number?
- 1629064464. 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 Gregory J. Shirk is enrolled with Medicare (CMS data updated 2026-10-02).
- 630 1st St NWMason City, IA 50401 (641) 423‑4455
Specialties
- Chiropracticprimary
Other chiropractors in Mason City
Clinicians with the same Medicare primary specialty in Mason City, IA — not a recommendation.
Clinician information
| Credential | DC |
|---|---|
| Medical school | Palmer College Chiropractic - Davenport |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1629064464 |
| 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