Quick answers
- Which hospitals does Christopher M. Tanner work at?
- Medicare's official clinician data lists Christopher M. Tanner at 3 hospitals: Lafayette Hospital and Clinics, Mercy Health System Corp and Mercy Walworth Hospital & Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Christopher M. Tanner see patients?
- Medicare's clinician data lists 3 practice locations, including Crystal Lake, IL, Harvard, IL and Lake Geneva, WI. Call before your visit to confirm the address.
- What is Christopher M. Tanner's specialty?
- Medicare lists Emergency Medicine as the primary specialty.
- Does Christopher M. Tanner accept Medicare assignment?
- Yes. Medicare's clinician data says Christopher M. Tanner 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 Christopher M. Tanner?
- (779) 220-5500, as listed in official Medicare / NPI Registry data.
- What is Christopher M. Tanner's NPI number?
- 1619394723. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Christopher M. Tanner works
Medicare's Facility Affiliation Data lists Christopher M. Tanner at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Lafayette Hospital and ClinicsDarlington, WI · Critical Access Hospital · CCN 521312
- Mercy Health System CorpJanesville, WI · Acute Care Hospital · CCN 520066
- Mercy Walworth Hospital & Medical CenterLake Geneva, WI · Critical Access Hospital · CCN 521357
Practice locations
Addresses where Christopher M. Tanner is enrolled with Medicare (CMS data updated 2026-10-02).
- 875 S Route 31Crystal Lake, IL 60014 (779) 220‑5500
- 901 Grant StHarvard, IL 60033 (815) 943‑5431
- N2950 State Rd, Suite 67Lake Geneva, WI 53147 (262) 245‑0535
Group practices
Medicare enrollment lists Christopher M. Tanner as a member of this group (CMS data updated 2026-10-02).
- Mercy Health System Corporation753 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Crystal Lake
Clinicians with the same Medicare primary specialty in Crystal Lake, IL — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Rush Medical College Of Rush University |
| Graduation year | 2014 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1619394723 |
| 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