Quick answers
- Which hospitals does Charles A. Longo work at?
- Medicare's official clinician data lists Charles A. Longo at 5 hospitals: Avera McKennan Hospital & University Health Center, Avera Queen of Peace, Avera St Lukes, Lakes Regional Healthcare and Spencer Municipal Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Charles A. Longo see patients?
- Medicare's clinician data lists 5 practice locations, including Sioux Falls, SD. Call before your visit to confirm the address.
- What is Charles A. Longo's specialty?
- Medicare lists Endocrinology as the primary specialty.
- Does Charles A. Longo accept Medicare assignment?
- Yes. Medicare's clinician data says Charles A. Longo 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 Charles A. Longo offer telehealth?
- Medicare's clinician data says Charles A. Longo offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Charles A. Longo?
- (605) 322-4878, as listed in official Medicare / NPI Registry data.
- What is Charles A. Longo's NPI number?
- 1841266608. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Charles A. Longo works
Medicare's Facility Affiliation Data lists Charles A. Longo at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Avera McKennan Hospital & University Health CenterSioux Falls, SD · Acute Care Hospital · CCN 430016
- Avera Queen of PeaceMitchell, SD · Critical Access Hospital · CCN 431340
- Avera St LukesAberdeen, SD · Acute Care Hospital · CCN 430014
- Lakes Regional HealthcareSpirit Lake, IA · Acute Care Hospital · CCN 160124
- Spencer Municipal HospitalSpencer, IA · Acute Care Hospital · CCN 160112
Practice locations
Addresses where Charles A. Longo is enrolled with Medicare (CMS data updated 2026-10-02).
- 1325 S Cliff AveSioux Falls, SD 57105
- 1325 S Cliff Ave, RadiologySioux Falls, SD 57105 (605) 322‑4878
- 1600 S Highline AveSioux Falls, SD 57110
- 1600 S Highline Ave, Suite 310Sioux Falls, SD 57110 (605) 322‑7600
- 911 E 20th St, Suite 300Sioux Falls, SD 57105 (605) 504‑1100
Group practices
Medicare enrollment lists Charles A. Longo as a member of this group (CMS data updated 2026-10-02).
- Avera McKennan959 clinicians in the group
Specialties
- Endocrinologyprimary
Other endocrinologists in Sioux Falls
Clinicians with the same Medicare primary specialty in Sioux Falls, SD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Iowa, Rj & L Carver College Of Medicine |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1841266608 |
| 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