Majonel Ontanillas, MD
Internal Medicine Physician · Las Vegas, NV
Majonel Ontanillas, MD is an internal medicine physician with a practice address in Las Vegas, Nevada, and NPI 1235105313, issued on Feb 27, 2006. Check the license (Nevada 12413, as entered in NPPES) on the Nevada State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- Majonel Ontanillas
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 12413 NV
223130 MA
Self-reported in NPPES; status is on the state search - Practice location
- 2704 N Tenaya Way, Las Vegas, NV 89128
- Phone
- (702) 243-8500
- Enumerated
- Feb 27, 2006
- Record last updated
- Nov 18, 2024
- Fax
- (702) 242-4194
- Medicaid IDs
- 2091283 MA
1235105313 NV - Medicare enrollment
- Enrolled (PECOS I20071018000583); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,229 in Nevada → Look up another NPI →
Also registered at 2704 N Tenaya Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Abesamis, APRN-RXNurse Practitioner1164902185
- Elena Andrews, M.D.Family Medicine Physician1588751556
- Anthony Arslan, D.O.Geriatric Medicine (Family Medicine) Physician1619132800
- Stephanie Ashman, M.D.Internal Medicine Physician1417279423
- Elizabeth Brewer, CNM, WNHPWomen's Health Nurse Practitioner1851399109
- Roslyn Collins, APNFamily Nurse Practitioner1891762712
Verify Majonel Ontanillas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNevada State Board of Medical Examiners
Search for license 12413Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.1 times the Medicare Part D claims of the average internal medicine physician in 2024
9,985 Medicare Part D claims for 860 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 29 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,007 claims
- Amlodipine Besylate539 claims
- Levothyroxine Sodium452 claims
- Losartan Potassium426 claims
- Lisinopril419 claims
- Omeprazole296 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
- Optum Medical Group II Rhodes P CLas Vegas, NV
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Majonel Ontanillas among 1,229 internal medicine physician records in Nevada
Majonel Ontanillas, MD is one of 1,229 internal medicine physician records with a practice address in Nevada. 82% 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 7% of them.
- NPI issued2006 · 7% of these records are older, 59% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1992 · median 2006 among the 772 with a school on file
- Record last updated2024 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Nevada practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
716 internal medicine physician records list a practice address in Las Vegas
They are 716 of the 65,269 NPPES records with a practice address in Las Vegas, and 1,229 internal medicine physician records in Nevada.
All 1,229 in Nevada → Every provider in Las Vegas → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Anne Kristensen, M.D.Las Vegas, NV 891281861499733
- Mohammed Najmi, M.D.Las Vegas, NV 891281699775163
Common questions
What is Majonel Ontanillas, MD's NPI number?
Majonel Ontanillas, MD's National Provider Identifier (NPI) is 1235105313, issued on Feb 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Majonel Ontanillas, MD located?
The NPPES record lists a practice address at 2704 N Tenaya Way, Las Vegas, NV, 89128. Phone: (702) 243-8500. Providers update this record themselves, so call before visiting.
How can I verify Majonel Ontanillas, MD's license?
NPPES lists Nevada license number 12413, as entered by the provider. Search the Nevada State Board of Medical Examiners at https://medboard.nv.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Majonel Ontanillas, MD prescribe under Medicare Part D?
In 2024, Majonel Ontanillas, MD had 9,985 Medicare Part D claims for 860 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.