Quick answers
- Which hospitals does John A. Hamilton work at?
- Medicare's official clinician data lists John A. Hamilton at 3 hospitals: Franklin General Hospital, Mary Greeley Medical Center and UnityPoint Health - Marshalltown. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Hamilton see patients?
- Medicare's clinician data lists 6 practice locations, including Ames, IA, Hampton, IA and Marshalltown, IA. Call before your visit to confirm the address.
- What is John A. Hamilton's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does John A. Hamilton accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Hamilton 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 A. Hamilton?
- (515) 239-4400, as listed in official Medicare / NPI Registry data.
- What is John A. Hamilton's NPI number?
- 1982720231. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John A. Hamilton works
Medicare's Facility Affiliation Data lists John A. Hamilton at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Franklin General HospitalHampton, IA · Critical Access Hospital · CCN 161308
- Mary Greeley Medical CenterAmes, IA · Acute Care Hospital · CCN 160030
- UnityPoint Health - MarshalltownMarshalltown, IA · Acute Care Hospital · CCN 160001
Practice locations
Addresses where John A. Hamilton is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1111 Duff AveAmes, IA 50010
- 1215 Duff AveAmes, IA 50010 (515) 239‑4400
- 1720 Central Ave EHampton, IA 50441
- 1720 Central Ave E, Franklin Medical CenterHampton, IA 50441 (641) 456‑5050
- 1720 Central E AveHampton, IA 50441
Group practices
Medicare enrollment lists John A. Hamilton as a member of these groups (CMS data updated 2026-10-02).
- McFarland Clinic PC363 clinicians in the group
- Franklin General Hospital27 clinicians in the group
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Ames
Clinicians with the same Medicare primary specialty in Ames, IA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 2006 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1982720231 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- 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