Quick answers
- Which hospitals does Karl E. Terwilliger work at?
- Medicare's official clinician data lists Karl E. Terwilliger at 1 hospital: Allen Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Karl E. Terwilliger see patients?
- Medicare's clinician data lists 4 practice locations, including Waterloo, IA, Sioux City, IA and Bettendorf, IA. Call before your visit to confirm the address.
- What is Karl E. Terwilliger's specialty?
- Medicare lists Anesthesiology as the primary specialty, and also Critical Care (Intensivists).
- Does Karl E. Terwilliger accept Medicare assignment?
- Yes. Medicare's clinician data says Karl E. Terwilliger 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 Karl E. Terwilliger?
- (712) 279-2303, as listed in official Medicare / NPI Registry data.
- What is Karl E. Terwilliger's NPI number?
- 1669426060. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Karl E. Terwilliger works
Medicare's Facility Affiliation Data lists Karl E. Terwilliger at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Allen HospitalWaterloo, IA · Acute Care Hospital · CCN 160110
Practice locations
Addresses where Karl E. Terwilliger is enrolled with Medicare (CMS data updated 2026-10-02).
- 1825 Logan AveWaterloo, IA 50703
- 2720 Stone Park BlvdSioux City, IA 51104 (712) 279‑2303
- 4480 Utica Ridge RdBettendorf, IA 52722
- 4480 Utica Ridge Rd, Suite 160Bettendorf, IA 52722 (563) 742‑5950
Group practices
Medicare enrollment lists Karl E. Terwilliger as a member of this group (CMS data updated 2026-10-02).
- Iowa Physicians Clinic Medical Foundation1,246 clinicians in the group
Specialties
- Anesthesiologyprimary
- Critical Care (Intensivists)also
Other anesthesiologists in Waterloo
Clinicians with the same Medicare primary specialty in Waterloo, IA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | R Franklin University Of Med & Sci/chicago Medical School |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1669426060 |
| 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