Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

MAJONEL ONTANILLAS MD
NPI 1235105313
Internal Medicine in Las Vegas, NV

Q: What is Majonel Ontanillas's NPI number?

The NPI number for Majonel Ontanillas is 1235105313. It was assigned to this individual provider in the NPPES registry on February 27, 2006.

Q: What is Majonel Ontanillas's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since February 27, 2006PECOS EnrolledAccepts Medicare Assignment

2875 S NELLIS BLVD STE 3, LAS VEGAS, NV 89121(702) 843-2420(833) 749-0351 Get Directions Write a Review

NPPES record last updated: September 30, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 30, 2026, Nov 18, 2024, Jan 17, 2017 (3 updates tracked since 2017).

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About Majonel Ontanillas Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MAJONEL ONTANILLAS MD (NPI 1235105313) is an individual internal medicine provider in Las Vegas, Nevada, licensed in Nevada (12413) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Las Vegas, and is a graduate of Other (1992).

NPPES Registry Identity

NPI1235105313

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameMAJONEL ONTANILLASCredential: MD

Location Address2875 S NELLIS BLVD STE 3Las Vegas, NV 89121-2087

Mailing Address6101 Blue Lagoon Dr Ste 200Miami, FL 33126-3168

Phone(702) 843-2420

Fax(833) 749-0351

Sole ProprietorNo

Medical School CMSOtherGraduated 1992

Enumeration DateFebruary 27, 2006

Last NPPES UpdateSeptember 30, 20263 updates tracked since enumeration

NPPES CertifiedSeptember 30, 2026

✔ NPI 1235105313 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Licenses✔ Licensed in NV · 12413✔ Licensed in MA · 223130

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

2875 S NELLIS BLVD STE 3, Las Vegas, NV 89121

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Secondary Practice Location 1

Location 12704 N Tenaya WayLas Vegas, NV 89128-0424 · Phone (702) 243-8500 · Fax (702) 242-4194

Other Identifiers 18

OtherA38033Medicare B

OtherJ28398Blue Shield Indemnity

Other4714498Cigna Health Plan

Other91262Fallon Community Health

Other042472266One Health Plan

Medicaid1235105313NV

OtherAA22681Harvard Pilgrim

Other042472266Private Healthcare System

Other419302Tufts Health Plan

Other2091283Medicaid Welfare

Medicaid2091283MA

Other784170Mvp Health Care

OtherJ28398Blue Care Elect

Other042472266Three Rivers

OtherJ28398Blue Shield Hmo Blue

Other042472266United Healthcare

Other1919739First Health

Other7398225Aetna Us Healthcare

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Majonel Ontanillas Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID6406832674

PECOS Enrollment IDI20071018000583

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Majonel Ontanillas reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Centerwell Senior Primary Care (nv) PC

Same address

Internal Medicine

2875 S NELLIS BLVD STE 3
Las Vegas, NV 89121

Reassigned Medicare billing, Nevada enrollment
Medicare enrollment name: Centerwell Senior Primary Care Nv P C
84 clinicians in this Medicare group

NPI 1306469788 (702) 843-2420

Southwest Medical Associates, Inc

6.2 mi

Internal Medicine

888 S RANCHO DR
Las Vegas, NV 89106

Reassigned Medicare billing, Nevada enrollment
406 clinicians in this Medicare group

NPI 1659346005 (702) 877-8600

Optum Medical Group II Rhodes P C

11 mi

Internal Medicine

2704 N TENAYA WAY
Las Vegas, NV 89128

Reassigned Medicare billing, Nevada enrollment
608 clinicians in this Medicare group

NPI 1790329407 (702) 877-5199

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

94 services55 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

34 services26 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 89121 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$131.25 typical visit price

range $57.07 – $173.24

Typical copayment $32.81 (range $14.26 – $43.31)

Most-billed visit code 99204

Established Patient

$100.60 typical visit price

range $18.27 – $140.96

Typical copayment $25.15 (range $4.56 – $35.24)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 11

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

TRACY J WAKEFIELD MD

Internal Medicine