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Daniel Fierer

  • ASSOCIATE PROFESSOR Medicine, Infectious Diseases
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  • Infectious Disease

  • American Board of Internal Medicine

Clinical Focus


  • MD, Yale University School of Medicine

  • Residency, Internal Medicine
    University of California, San Diego

  • Fellowship, Infectious Diseases
    National Institutes of Health

  • Fellowship, Infectious Diseases
    University of California Hospitals

  • Fellowship, Infectious Diseases
    National Institutes of Health


    Dr. Fierer sees patients in the FPA, 5 East 98th Street, 11th floor, New York, NY 10029 for infectious diseases, specializing in HIV and/or Hepatitis C Virus infection. Most insurance are accepted. Dr. Fierer also sees patients with or at risk for HIV/AIDS in the Jack Martin Fund Clinic located in the Center for Ambulatory Medicine, 17 East 102nd Street, 3rd floor, New York, NY 10029. Insurances accepted are Medicaid, Medicare and ADAP.


Dr. Fierer's research interests are focused on the study of acute Hepatitis C (HCV) infection in HIV-infected patients. Hepatitis C infection is highly prevalent in HIV-infected people, but Hepatitis C is rarely diagnosed during the acute phase (first 6 months) of infection and so little is known about the early course of Hepatitis C infection. Further, people who are already HIV-infected at the time they contract HCV infection may be at particular risk of having significant liver disease: a preliminary study in collaboration with Drs. Branch and Dieterich showed the presence of moderately advanced liver damage in HIV-infected people who have acute HCV infection. Dr. Fierer has initiated a larger study to evaluate HIV-infected patients referred by their physicians for acute HCV infection to further investigate the early effects of this infection on liver pathology, on the natural history of the disease, on the effectiveness of treatment, and of the mode of transmission.


Fierer DS, Uriel AJ, Carriero DC, Klepper A, Dieterich DT, Mullen MP, Thung SN, Fiel MI, Branch AD. Liver fibrosis in an outbreak of acute HCV in HIV-infected men: a prospective cohort study. J Infect Dis 2008 September;.

Fierer DS, Vargas J Jr., Patel N, Clover G. Absence of erythrocyte-associated HIV-1 in vivo. J. Infect. Dis 2007; 196: 587-590.

Fierer DS, Klotman ME. Kidney and central nervous system as reservoirs of HIV infection. Curr Opin HIV AIDS 2006; 1: 115-120.

Schwartz EJ, Fierer DS, Neumann AU, Keller MJ, Parkas V, Zhang DY, Klotman ME, Winston JA, Klotman PE. HIV-1 dynamics in haemodialysis patients. AIDS 2002 June; 16(9): 1301-1303.

Kaplan G, Thomas S, Fierer DS, Mulligan K, Hastlett PA, Fessel WJ, Smith LG, Kook KA, Stirling D, Schambelan M. Thalidomide for the treatment of AIDS-associated wasting. AIDS Res Hum Retroviruses 2000 September; 16(14): 1345-1355.

Fierer DS, Challberg MD. The stoichiometry of binding of the herpes simplex virus type 1 origin binding protein, UL9, to OriS. J Biol Chem 1995 March; 270(13): 7330-7334.

Fierer DS, Challberg MD. Purification and characterization of UL9, the herpes simplex virus type 1 origin-binding protein. J Virol 1992 July; 66(7): 3986-3995.

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.

Below are financial relationships with industry reported by Dr. Fierer during 2015 and/or 2016. Please note that this information may differ from information posted on corporate sites due to timing or classification differences.


  • Salamandra, LLC

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.

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Faculty Practice Associates

Department of Medicine - Infectious Disease
5 East 98th Street - 11th Floor
New York, NY 10029

Tel: 212-241-3150
Fax: 212-534-3240
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Office Hours:
  • Monday 9:00am - 5:00pm
  • Tuesday 9:00am - 5:00pm
  • Wednesday 9:00am - 5:00pm
  • Thursday 9:00am - 5:00pm
  • Friday 9:00am - 5:00pm

Center for Advanced Medicine

17 East 102nd Street
3rd Floor, Room D3-251
New York, NY 10029

Tel: 212-241-7968
Fax: 212-824-2312
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