Quick answers
- Which hospitals does Grant A. Wintheiser work at?
- Medicare's official clinician data lists Grant A. Wintheiser at 4 hospitals: Abbott Northwestern Hospital, Buffalo Hospital, Cambridge Medical Center and Mercy Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Grant A. Wintheiser see patients?
- Medicare's clinician data lists 2 practice locations, including Saint Paul, MN and Cambridge, MN. Call before your visit to confirm the address.
- What is Grant A. Wintheiser's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Internal Medicine.
- Does Grant A. Wintheiser accept Medicare assignment?
- Yes. Medicare's clinician data says Grant A. Wintheiser 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.
- Does Grant A. Wintheiser offer telehealth?
- Medicare's clinician data says Grant A. Wintheiser offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Grant A. Wintheiser?
- (651) 241-5111, as listed in official Medicare / NPI Registry data.
- What is Grant A. Wintheiser's NPI number?
- 1043770092. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Grant A. Wintheiser works
Medicare's Facility Affiliation Data lists Grant A. Wintheiser at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Abbott Northwestern HospitalMinneapolis, MN · Acute Care Hospital · CCN 240057
- Buffalo HospitalBuffalo, MN · Acute Care Hospital · CCN 240076
- Cambridge Medical CenterCambridge, MN · Acute Care Hospital · CCN 240020
- Mercy HospitalCoon Rapids, MN · Acute Care Hospital · CCN 240115
Practice locations
Addresses where Grant A. Wintheiser is enrolled with Medicare (CMS data updated 2026-10-02).
- 225 Smith Ave N, Suite 200Saint Paul, MN 55102 (651) 241‑5111
- 701 Dellwood St SCambridge, MN 55008 (763) 688‑8700
Group practices
Medicare enrollment lists Grant A. Wintheiser as a member of this group (CMS data updated 2026-10-02).
- Allina Health System3,842 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Internal Medicinealso
Other hematologist-oncologists in Saint Paul
Clinicians with the same Medicare primary specialty in Saint Paul, MN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 2019 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1043770092 |
| 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