Sam T. Ontiveros, M.D.
Emergency Medicine Physician · Charleston, SC
Sam T. Ontiveros, M.D. is an emergency medicine physician with a practice address in Charleston, South Carolina, and NPI 1538522396, issued on Mar 30, 2016. Check the license (South Carolina 85834, as entered in NPPES) on the South Carolina Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Sam T. Ontiveros
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License numbers
- 85834 SC
A162448 CA
Self-reported in NPPES; status is on the state search - Practice location
- 171 Ashley Ave, Charleston, SC 29425
- Phone
- (843) 792-1414
- Enumerated
- Mar 30, 2016
- Record last updated
- Oct 27, 2023
- Medicare enrollment
- Enrolled (PECOS I20190801000320); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,244 in South Carolina → Look up another NPI →
Also registered at 171 Ashley Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Sam T. Ontiveros in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersSouth Carolina Board of Medical Examiners
Search for license 85834Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
30% more Medicare Part D claims than the average emergency medicine physician in 2024
294 Medicare Part D claims for 208 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 46 claims were for opioids.
Most prescribed
- Oxycodone Hcl44 claims
- Xarelto24 claims
- Amoxicillin-Clavulanate Potass23 claims
- Cefpodoxime Proxetil22 claims
- Cefadroxil21 claims
- Ibuprofen18 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSan Marcos, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sam T. Ontiveros among 1,244 emergency medicine physician records in South Carolina
Sam T. Ontiveros, M.D. is one of 1,244 emergency medicine physician records with a practice address in South Carolina. 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 2016, is newer than 64% of them.
- NPI issued2016 · 64% of these records are older, 34% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2016 · median 2012 among the 752 with a school on file
- Record last updated2023 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a South Carolina practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
223 emergency medicine physician records list a practice address in Charleston
They are 223 of the 10,840 NPPES records with a practice address in Charleston, and 1,244 emergency medicine physician records in South Carolina.
All 1,244 in South Carolina → Every provider in Charleston → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Christina Bourne, MDCharleston, SC 294251932183373
- Jeffrey Caporossi, MDCharleston, SC 294251932150166
- Christine Carr, MDCharleston, SC 294251649388695
- Heather Farley, MDCharleston, SC 294251952389769
- Charles Gilman, MDCharleston, SC 294251831207877
- Robert Greaves, MDCharleston, SC 294251629003546
- Gregory Hall, M.D.Charleston, SC 294251174574297
- Terry Kowalenko, M.D.Charleston, SC 294251023045085
Common questions
What is Sam T. Ontiveros, M.D.'s NPI number?
Sam T. Ontiveros, M.D.'s National Provider Identifier (NPI) is 1538522396, issued on Mar 30, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Sam T. Ontiveros, M.D. located?
The NPPES record lists a practice address at 171 Ashley Ave, Charleston, SC, 29425. Phone: (843) 792-1414. Providers update this record themselves, so call before visiting.
How can I verify Sam T. Ontiveros, M.D.'s license?
NPPES lists South Carolina license number 85834, as entered by the provider. Search the South Carolina Board of Medical Examiners at https://verify.llronline.com/LicLookup/Med/Med.aspx?div=22. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sam T. Ontiveros, M.D. prescribe under Medicare Part D?
In 2024, Sam T. Ontiveros, M.D. had 294 Medicare Part D claims for 208 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.