Charles A. Longo, M.D.
Endocrinology, Diabetes & Metabolism Physician · Sioux Falls, SD
Charles A. Longo, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Sioux Falls, South Dakota, and NPI 1841266608, issued on Feb 23, 2006. Check the license (South Dakota 5192, as entered in NPPES) on the South Dakota Board of Medical and Osteopathic Examiners; the Medicare figures below come from public CMS files.
- Name
- Charles A. Longo
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 5192 SD
Self-reported in NPPES; status is on the state search - Practice location
- 1315 S. Cliff Ave, Sioux Falls, SD 57105
- Phone
- (605) 322-7600
- Enumerated
- Feb 23, 2006
- Record last updated
- Dec 13, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (605) 322-7601
- Medicaid IDs
- 46022474351 NE
0574087 IA
028917500 MN
6004720 SD - Medicare enrollment
- Enrolled (PECOS I20031230000655); accepts Medicare assignment
- Medical or professional school
- University Of Iowa, Rj & L Carver College Of Medicine, 1998
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 25 in South Dakota → Look up another NPI →
Verify Charles A. Longo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Dakota Board of Medical and Osteopathic Examiners
Search for license 5192Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
3,621 Medicare Part D claims for 334 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 46% of claims.
Most prescribed
- Levothyroxine Sodium567 claims
- Ozempic270 claims
- Metformin Hcl185 claims
- Synthroid160 claims
- Novolog Flexpen111 claims
- Metformin Hcl Er110 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $68.19
4 payments; by number, the most common kind was food and beverage; the largest payer was Medtronic, Inc. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Avera MckennanSioux Falls, SD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Charles A. Longo among 25 endocrinology, diabetes & metabolism physician records in South Dakota
Charles A. Longo, M.D. is one of 25 endocrinology, diabetes & metabolism physician records with a practice address in South Dakota. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 60% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1998 · median 2008 among the 17 with a school on file
- Record last updated2013 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a South Dakota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in South Dakota
There are 25 endocrinology, diabetes & metabolism physician records in South Dakota.
All 25 in South Dakota → Every provider in Sioux Falls → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Nour Aljariri Alhesan, MDSioux Falls, SD 571051346625415
- Brandon Allard, M.D.Sioux Falls, SD 571051124023882
- Raquel De Leon Anel-Tiangco, M.D.Sioux Falls, SD 571051740462803
- Richard Barth, M.D.Sioux Falls, SD 571051659375038
- Richard Crawford, MDSioux Falls, SD 571051164528261
- Marie Angelica Diaz, M.D.Sioux Falls, SD 571051588072532
- Randall Fenner, M.D.Sioux Falls, SD 571051073780375
- Marcio Griebeler, M.D.Sioux Falls, SD 571051902041197
Common questions
What is Charles A. Longo, M.D.'s NPI number?
Charles A. Longo, M.D.'s National Provider Identifier (NPI) is 1841266608, issued on Feb 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Charles A. Longo, M.D. located?
The NPPES record lists a practice address at 1315 S. Cliff Ave, Sioux Falls, SD, 57105. Phone: (605) 322-7600. Providers update this record themselves, so call before visiting.
How can I verify Charles A. Longo, M.D.'s license?
NPPES lists South Dakota license number 5192, as entered by the provider. Search the South Dakota Board of Medical and Osteopathic Examiners at https://www.sdbmoe.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Charles A. Longo, M.D. prescribe under Medicare Part D?
In 2024, Charles A. Longo, M.D. had 3,621 Medicare Part D claims for 334 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.