Photo of Josef Machac

Josef Machac

  • ASSOCIATE PROFESSOR Medicine, Cardiology
Print ProfilePrint Profile


  • Cardiovascular Disease

  • Nuclear Medicine

  • American Board of Internal Medicine

Clinical Focus

  • Bleeding Scan
  • Brain Scan
  • Gastrointestinal Function Scan
  • Hyperthyroidism
  • Hypothyroidism
  • Liver-Spleen Scan
  • Lung Scan
  • Lymphoscintigraphy
  • MIBG Scan
  • MUGA Scan
  • Octreotide Scan
  • PET/CT Scan
  • Parathyroid Scan


  • MD, Brown University

  • Residency, Internal Medicine
    Mount Sinai Hospital

  • Residency, Nuclear Medicine
    Mount Sinai Hospital

  • Fellowship, Nuclear Cardiology
    Mount Sinai Hospital

  • Fellowship, Cardiology
    Mount Sinai Hospital


    Dr. Josef Machac received his undergraduate degree of Bachelor in Science, Magna Cum Laude, in 1975 from Brown University, where he received an M.D. in 1978. He did his internship and residency in internal medicine at The Mount Sinai Hospital between 1978 and 1981, and between 1981 and 1983, a residency in nuclear medicine. This was followed be a fellowship in nuclear cardiology from 1983 to 1984, and a fellowship in clinical cardiology from 1985 to 1986. Dr. Machac is board certified in internal medicine, nuclear medicine, and cardiology.

    Dr. Machac has been an attending in nuclear cardiology from 1984 to the present time. He became Director of Nuclear Cardiology in 1988 and held that position until 1996. In 1993, he became Director of Nuclear Medicine. In 1985, he because Assistant Professor in Medicine, and in 1993, Associate Professor in Radiology. In 2003, he became Professor in Radiology.

    Throughout his career in nuclear cardiology, Dr. Machac has been responsible for many innovations in diagnostic cardiology at Mount Sinai. This includes the introduction of SPECT (single photon emission tomography) cardiac imaging, pharmacological stress imaging, imaging with Tc-99m labeled perfusion agents, myocardial viability imaging, and more recently, cardiac PET imaging.

    Dr. Machac has delivered many invited lectures at Mount Sinai, at regional, national, and international meetings and symposia, has organized numerous educational symposia at regional and national meetings, and recently was president of the Cardiovascular Council of the Society of Nuclear Medicine. He has authored or coauthored many papers and numerous chapters.

    At the present time, Dr. Machac is director of the Clinical PET Center and Nuclear Medicine at Mount Sinai, which offer high quality state-of-the art cardiac imaging for diagnosis and evaluation of coronary artery disease, and myocardial viability in patients with poor cardiac function. He also sees patients in the cardiac clinic and Faculty Practice Associates' suite.

Industry Relationships

Physicians and scientists on the faculty of the Icahn School of Medicine at Mount Sinai often interact with pharmaceutical, device and biotechnology companies to improve patient care, develop new therapies and achieve scientific breakthroughs. In order to promote an ethical and transparent environment for conducting research, providing clinical care and teaching, Mount Sinai requires that salaried faculty inform the School of their relationships with such companies.

Dr. Machac did not report having any of the following types of financial relationships with industry during 2015 and/or 2016: consulting, scientific advisory board, industry-sponsored lectures, service on Board of Directors, participation on industry-sponsored committees, equity ownership valued at greater than 5% of a publicly traded company or any value in a privately held company. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.

Mount Sinai's faculty policies relating to faculty collaboration with industry are posted on our website. Patients may wish to ask their physician about the activities they perform for companies.

Insurance Information

Physicians who provide services at hospitals and facilities in the Mount Sinai Health System might not participate in the same health plans as those Mount Sinai hospitals and facilities (even if the physicians are employed or contracted by those hospitals or facilities).

Information regarding insurance participation and billing by this physician may be found on this page, and can also be obtained by contacting this provider directly. Because physicians insurance participation can change, the insurance information on this page may not always be up-to-date. Please contact this physician directly to obtain the most up-to-date insurance information.

Insurance and health plan networks that the various Mount Sinai Health System hospitals and facilities participate in can be found on the Mount Sinai Health System website.

Edit profile in Sinai Central


Guggenheim Pavilion Floor MC Room NM-150 D
1190 Fifth Avenue
New York, NY 10029

Tel: 212-241-7775
Nuclear Medicine Associates

1 Gustave Levy Place
New York, NY 10029

Tel: 212-241-6969
Fax: 212-831-2851
Get Directions

Office Hours:
  • Monday 8:00am - 5:00pm
  • Tuesday 8:00am - 5:00pm
  • Wednesday 8:00am - 5:00pm
  • Thursday 8:00am - 5:00pm
  • Friday 8:00am - 5:00pm
  • Czech
  • Spanish
  • German
  • Russian
  • French
Insurance Plans
  • Aetna U.S. Healthcare
  • Beech Street
  • Best Doctor
  • CarePlus, LLC
  • CenterCare, Inc.
  • Cigna
  • Devon Health Services
  • Empire Blue Cross/Blue Shield
  • Fidelis Care NY
  • First Health
  • Group Health Insurance, Inc.
  • Health Insurance Plan (HIP)
  • HealthFirst/Medicaid HMO
  • HealthPlus, Inc.
  • Healthfirst
  • Horizon Healthcare
  • Island Group
  • Local 1199
  • Magnacare
  • Medicaid
  • Medicaid New Jersey
  • Medicare
  • MetroPlus Health Plan
  • MultiPlan, Inc.
  • Neighborhood Health Providers, LLC
  • Oxford Health Plans
  • PHS/Healthnet/Guardian
  • Private Healthcare Systems (PHCS)
  • Travel Care Services
  • United Health Care Empire Plan
  • United Healthcare
  • Vytra
Payment Methods
  • Master Card
  • Visa
  • American Express
  • Discover
  • Personal Check
  • Cash