Are you searching for a new HIV provider?

Are you are suffering from non-healing wounds?

Are experiencing frequent urinary tract infections?

Are you taking medications that lower your immune system?

Are you having chronic shortness of breath with productive cough?

Our experienced team is committed to providing you with the highest level of care, supporting you through every step of your treatment journey.

Our Services

  • Generalized Infectious Disease Care

    We diagnose and treat various infections, including:

    Skin & Soft Tissue Infections

    Pneumonia

    Sinusitis

    Gastrointestinal Infections

    Urinary Tract Infections

    Sexually Transmitted Diseases

    Wound Infections

  • Wound Infections

    For optimal outcomes, patients with chronic wound infections require a multidisciplinary team approach to medical services. Your comprehensive team should include an Infectious Disease specialist, Wound Care services, and evaluations from Vascular Surgery or Podiatry.

  • Fungal and Mycobacterial Infections

    Emerging fungal infections, including those caused by yeasts and molds, as well as slower-growing bacteria like Non-MTB Mycobacterial infections, are increasingly diagnosed and present specific treatment challenges. Our providers specialize in these serious and potentially debilitating infectious diseases.

  • Hepatitis and HIV Care

    Hepatitis C is a curable disease, and the experience of our healthcare providers in managing treatment and monitoring responses can greatly enhance your care and experience during and after treatment.

    New treatments for HIV are emerging that offer fewer side effects and improved tolerance.

  • Transplant and Immunocompromised Host

    Immunocompromised individuals, such as those undergoing chemotherapy or monoclonal antibody treatment, are at risk for specific infections and may require preventive measures. Services are provided for solid organ transplant recipients, including those of the kidney, liver, SPK, heart, and lung, as well as for stem cell transplant patients.

  • Long Term Antibiotic Care

    At our clinic, we specialize in providing comprehensive long-term antibiotic care for patients with severe infections. Our services include:

    Antibiotic Management: We tailor antibiotic regimens to each patient's specific needs, ensuring optimal effectiveness and minimizing side effects.

    Lab Draws: Regular lab tests are conducted to monitor your progress and adjust treatment as necessary.

    Medication Adjustments: We carefully adjust your medication dosages throughout the treatment process to ensure the best possible outcomes.

Locations We Serve

  • Inpatient Services

    Sunrise Hospital

    Mountain View Hosptial

    Southern Hills Hospital

    Summerlin Hospital

    Valley Hospital

    Spring Valley Hospital

  • Rehabilitation

    Encompass Rehabilitation

    Sunrise Rehabilitation

    Mountain View Rehabilitation

    PAM Rehabilitation

    Valley Specialty Hospital

  • Long Term Acute Care

    Kindred Sahara

    Kindred Flamingo

    PAM Long Term Acute Care

  • Outpatient Clinic

    APEX Infectious Disease Clinic

    4472 S. Eastern Ave.

    Las Vegas, NV

    89919

Plans, Payment, & Billing

  • Health Plan of Nevada

    Anthem BlueCross BlueShield

    SilverSummit Health Plan

    Medicare/Medicaid

    Aetna

    Cigna

    Sierra Health & Life

    United HealthCare Services Inc.

    Culinary

    CareMoreHealth

    Teachers Health Trust

    and many more....

  • Medical services are provided and billed by our clinic. Our providers participate in most of the major health insurance plans in the region. The health plans we currently accept are listed below.

    If your plan is not listed, we will not be able to file a claim through your insurance on your behalf. However, we can provide you with a form to submit to your insurance company, which will instruct them on how to send reimbursements directly to you.

    Please be aware that with any health plan, there may be deductibles and copayments for which you could be responsible.

  • What billing or insurance information will I receive?

    ​You will receive a copy of your bill. After your insurance has paid, we'll provide you with a monthly statement of your account.

    ​How long will it take to get things settled with the insurance company?

    Generally, it takes from 45 to 60 days to obtain payment from an insurance carrier.​

    ​​Why am I getting bills from physicians?

    ​Each physician who provides professional services will send you a separate bill from his or her office. These physicians will include:

    - your own physician
    - other physicians who conducted tests and procedures
    - consulting physicians chosen by your primary physician to read and interpret test results.

    These physicians may include specialists in anesthesiology, cardiology, emergency medicine, nuclear medicine, pathology, radiology, or urodynamics. You will be responsible for paying these bills as well.

    ​​I received a notice that my insurance company has paid on my bill -- but I can't understand how they calculated their payment amount. Do you know?

    ​If we have received any such information from your insurance company, we'll be glad to share it with you. However, for answers to any questions about insurance payments, deductibles, or co-payments, you generally need to check with your insurance company.

Meet the Team

  • Babak Hooshmand, MD

    Dr. Hooshmand received his medical degree from Shahid Beheshti University of Medicine in Tehran, Iran. He completed both his internal medicine residency and infectious disease fellowship at Ascension St. John Hospital and Medical Center in Detroit, Michigan.

    Before specializing in infectious disease, Dr. Hooshmand worked as a hospitalist. He is board-certified by the American Board of Internal Medicine and in Infectious Disease.

    Dr. Hooshmand has a passion for teaching and enjoys traveling and exploring nature in his free time.

  • Dima Youssef, MD

    After graduating from medical school in Syria, Dr. Youssef moved to the United States to pursue advanced training. She completed her internal medicine residency at St. Joseph Hospital in Ann Arbor, Michigan, and an infectious disease fellowship at Ascension Saint John Hospital in Detroit, Michigan.

    In 2023, Dr. Youssef joined Comprehensive Infectious Disease of Nevada, bringing her extensive expertise to the community.

    Dr. Youssef is married and has three children. Outside of work, she enjoys outdoor activities, cooking, and spending quality time with her family.

  • Li-Chien Chen, DO

    Dr. Chen grew up on the island of Hawaii and graduated from Midwestern University Osteopathic Medicine in Arizona. He completed his internal medicine residency in Parkersburg, West Virginia, and his infectious disease training at the University of Missouri.

    After his training, Dr. Chen practiced infectious disease for three years in Reno, Nevada, before moving to Las Vegas in 2021. He has since established residency in Las Vegas and continues to provide high-quality patient care.

    In his spare time, Dr. Chen enjoys hiking, golfing, traveling, snowboarding, and participating in bar trivia.

  • John O'Reilly, MD, MPH, AAHIVS

    Dr. O'Reilly is a board-certified infectious disease specialist and internal medicine physician. His introduction to the medical field began as a combat medic for the US Army Reserve. He earned his undergraduate degree in microbiology from Cornell University, followed by a master's degree in medical science from Yale University, where he was awarded the prestigious Wilbur G. Downs Fellowship and conducted research on HIV and hepatitis C co-infection in Uganda.

    Dr. O'Reilly received his MD and MPH from Tulane University, completed his residency at Columbia University, and his Infectious Diseases fellowship at UCLA. Since 2021, he has been practicing in Las Vegas, where he serves on the board of the Southern Nevada Infectious Disease Society.

    He has a special interest in HIV care, NTM infections, transplant infectious diseases, and tropical medicine. Dr. O'Reilly is also passionate about medical education, teaching medical residents, lecturing at a nursing college, and hosting an infectious disease journal club.

  • Ricardo Asuncion, APRN

    Mr. Ricardo Asuncion is a nurse practitioner specializing in Infectious Disease. He graduated with his Bachelor of Science in Nursing from De La Salle University in the Philippines, achieving Dean's List honors in 2014. Ricardo worked as a registered nurse for over 5 years across various specialties including cardiology, neurology, psychiatry, wound care, rehab, and long-term care facilities.

    He earned his Master of Science in Nursing with honors from Chamberlain University, specializing in Family Medicine, in 2019. Ricardo furthered his education by completing his Doctor of Nursing Practice degree in 2023 with a focus on Antibiotic Stewardship, making significant contributions to the infectious disease community through his research. He received extensive training in Infectious Disease and antibiotic stewardship from physicians in Las Vegas, and has expertise in Cardiovascular and Thoracic Surgery, Internal Medicine, and Primary Care.

    Outside of his professional life, Ricardo enjoys morning hikes with his Silver Labrador and has a passion for music, playing instruments such as the piano, drums, and guitar. Fun fact: Ricardo was a lead singer in a band before pursuing his career in the medical field.

  • Mary Holstein, APRN

    Mary Holstein is an Acute Care Nurse Practitioner since 2021. She originally attended the Army Medical Education Department where she obtained her Licensed Practical Nursing Certification. Following 6 years of active-duty service in the United States Army, she pursued her desire for further nursing education, receiving follow on degrees from El Paso Community College (ADN), the University of Texas at El Paso (BSN), and Texas Tech University Health Sciences Center (MSN). Mary is a Board-Certified Adult Nurse Practitioner and licensed in Nevada and Texas. She has worked primarily in inpatient Endocrinology and Cardiovascular Intensive Care while returning to education one final time to receive her Doctorate in Nursing Practice and Leadership (DNP) degree in May 2024.

    Mary is an active member of several professional organizations including the American Association of Nurse Practitioners, the American Nurses Association, the American Association of Critical-Care Nurses, the Nevada Nurses Association, Sigma Theta Tau, the International Honor Society of Nursing, and Phi Kappa Phi.

    Outside of work, you will find Mary traveling, reading, spending time with her pets, and following the WNBA Aces basketball team.

  • Lea Diola, APRN

    Ms. Lea Diola is a nurse practitioner specializing in Infectious Disease. She graduated Magna Cum Laude with Honors from the University of Arizona's Bachelor of Science in Nursing program, where she actively participated in research and was a member of the Research and Clinical Scholarship committee at the College of Nursing. Lea worked as a registered nurse for over 5 years before advancing her career as a nurse practitioner.

    She earned her Doctor of Nursing Practice degree from the University of Arizona, focusing on Adult-Gerontology Acute Care. Lea is a member of both the American Association of Nurse Practitioners and the Infectious Disease Society of America. Outside of work, she enjoys traveling and is passionate about exploring different cuisines as an avid foodie.

  • Leilani Marcelino, APRN

    Leilani P. Marcelino is a family and adult nurse practitioner specializing in infectious disease at Comprehensive Infectious Disease of Nevada. She completed her Bachelor of Science in Nursing at Silliman University and went on to earn her Master of Science degree at Charles R. Drew University of Medicine and Science in Los Angeles, California. Leilani holds a national certification with the American Academy of Nurse Practitioners.

  • Todd Radivan, PA

  • Jessica Radivan, PA