Quick answers
- Which hospitals does John A. Charlson work at?
- Medicare's official clinician data lists John A. Charlson at 3 hospitals: Community Memorial Hospital, Froedtert Memorial Lutheran Hospital and Holy Family Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Charlson see patients?
- Medicare's clinician data lists 2 practice locations, including Milwaukee, WI. Call before your visit to confirm the address.
- What is John A. Charlson's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Internal Medicine.
- Does John A. Charlson accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Charlson 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 John A. Charlson offer telehealth?
- Medicare's clinician data says John A. Charlson offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John A. Charlson?
- (414) 805-3666, as listed in official Medicare / NPI Registry data.
- What is John A. Charlson's NPI number?
- 1386668192. 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. Charlson works
Medicare's Facility Affiliation Data lists John A. Charlson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Community Memorial HospitalMenomonee Falls, WI · Acute Care Hospital · CCN 520103
- Froedtert Memorial Lutheran HospitalMilwaukee, WI · Acute Care Hospital · CCN 520177
- Holy Family MemorialManitowoc, WI · Acute Care Hospital · CCN 520107
Practice locations
Addresses where John A. Charlson is enrolled with Medicare (CMS data updated 2026-10-02).
- 8701 W Watertown PlankMilwaukee, WI 53226 (414) 805‑3666
- 8701 Watertown Plank Rd, Room 4041 MfrcMilwaukee, WI 53226 (414) 805‑3666
Group practices
Medicare enrollment lists John A. Charlson as a member of this group (CMS data updated 2026-10-02).
- The Medical College of Wisconsin Inc2,115 clinicians in the group
Specialties
- Medical Oncologyprimary
- Internal Medicinealso
Other oncologists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 1999 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1386668192 |
| 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