Charles A. Longo, M.D.
NPI 1841266608ActiveIndividual· Internal Medicine, Endocrinology, Diabetes & Metabolism· Sioux Falls, SD
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) in Sioux Falls, South Dakota, trained at University of Iowa, Rj & L Carver College of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,208,420 for 3,621 claims, against $53,512 paid for services in 2024. Amgen Inc. was the largest of 6 companies reporting payments in 2025, $232.67 in all, mostly food and beverage.
Overview
| NPI | 1841266608 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 23, 2006 |
| Last updated in NPPES | Dec 13, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | 5192 | SD |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Endocrinology (SD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 361 |
|---|---|
| Services billed | 875 across 17 procedure codes |
| Paid by Medicare | $53,512 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,621 · 6,068 30-day fills |
|---|---|
| Patients | 334 |
| Total drug cost | $1,208,420 |
| Generic share | 46% of claims |
Education and affiliations
| Medical school | University of Iowa, Rj & L Carver College of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Endocrinology |
| Telehealth | Offers telehealth |
Medical group
- Avera McKennanSioux Falls, SD · 959 clinicians
Hospital affiliations
- Avera McKennan Hospital & University Health CenterSioux Falls, SD
- Avera Queen of PeaceMitchell, SD
- Avera St LukesAberdeen, SD
- Lakes Regional HealthcareSpirit Lake, IA
- Spencer Municipal HospitalSpencer, IA
Industry payments (Open Payments)
- 2025$232.67 · 12 payments from 6 companies
- 2024$68.19 · 4 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $68.55 | 4 |
| Chiesi USA, Inc. | $54.40 | 2 |
| Pfizer Inc. | $54.14 | 3 |
| Novartis Pharmaceuticals Corporation | $21.83 | 1 |
| Medtronic, Inc. | $17.33 | 1 |
What the 2025 payments were for
- Food and Beverage$232.67 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 25 endocrinologists in Sioux Falls · All endocrinologists in South Dakota