Quick answers
- Which hospitals does Lars E. Peterson work at?
- Medicare's official clinician data lists Lars E. Peterson at 2 hospitals: Ivinson Memorial Hospital and Medical Center of the Rockies. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Lars E. Peterson see patients?
- Medicare's clinician data lists 1 practice location in Laramie, WY. Call before your visit to confirm the address.
- What is Lars E. Peterson's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Lars E. Peterson accept Medicare assignment?
- Yes. Medicare's clinician data says Lars E. Peterson 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 Lars E. Peterson?
- (307) 742-2142, as listed in official Medicare / NPI Registry data.
- What is Lars E. Peterson's NPI number?
- 1023110640. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Lars E. Peterson works
Medicare's Facility Affiliation Data lists Lars E. Peterson at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ivinson Memorial HospitalLaramie, WY · Acute Care Hospital · CCN 530025
- Medical Center of the RockiesLoveland, CO · Acute Care Hospital · CCN 060119
Practice locations
Addresses where Lars E. Peterson is enrolled with Medicare (CMS data updated 2026-10-02).
- 255 N 30th StLaramie, WY 82072 (307) 742‑2142
Group practices
Medicare enrollment lists Lars E. Peterson as a member of this group (CMS data updated 2026-10-02).
- Ivinson Memorial Hospital63 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Laramie
Clinicians with the same Medicare primary specialty in Laramie, WY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023110640 |
| 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