John Fahy

MD MS

Pulmonologist

Dr. John Fahy is a pulmonologist who has a special interest in treating patients with asthma and serves as director of UCSF’s severe asthma clinic. He also cares for critically ill patients in the intensive care units.

Fahey directs the UCSF Airway Clinical Research Center. His research receives funding from the National Institutes of Health and various foundations, as well as contracts from biotechnology and pharmaceutical companies. The center studies the underlying disease mechanisms of asthma, cystic fibrosis and other airway diseases.

Fahy earned his medical degree at University College Dublin After internal medicine training in Dublin, he completed fellowship training in pulmonary and critical care medicine at UCSF. He joined the faculty in 1993.

He is the Michael S. Stulbarg Endowed Chair in Pulmonary Medicine.

  • Education

    University College, Dublin Ireland, 1985

  • Residencies

    University College Dublin, Internal Medicine, 1989

  • Fellowships

    UCSF, Pulmonary Medicine, 1992

  • Board Certifications

    Internal Medicine, American Board of Internal Medicine

  • Academic Title

    Professor

Conditions I specialize in

  • Severe asthma

Clinics I work with

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Asthma Clinic

400 Parnassus Ave., Fifth Floor
San Francisco, CA 94143-0359

(415) 353-2961
Th, 8:30 - 11:30 a.m.

Pulmonary Practice at Parnassus

400 Parnassus Ave., Fifth Floor
San Francisco, CA 94143

(415) 353-2961
M-F, 8 a.m. - 5 p.m.

My reviews

4.7

Overall Experience
46 Reviews
I feel extremely fortunate to be under the expert care of Dr. Fahy for all my pulmonary issues.
Explained things in a way that was easy to understand
46 Reviews
Did the doctor pay attention to your concerns
46 Reviews
Gave easy to understand instructions about taking care of health problems or concerns
44 Reviews
Knew the important information about your medical history
45 Reviews
The provider showed respect for what you had to say
45 Reviews
The provider spent enough time with me
45 Reviews
Read all reviews About our process

Selected research

Decorative Caduceus

Tissue Immune Interaction in Nasal Polyposis

This study enrolls chronic rhinosinusitis patients with and without nasal polyps. Investigators aim to compare the percentage of ILC2 and tuft cells present in nasal tissue and secretions between those who present with nasal polyp...

Recruiting

Decorative Caduceus

PrecISE (Precision Interventions for Severe and/or Exacerbation-Prone Asthma) Network Study

Assessed prior to bronchodilator administration. Efficacy analyses will compare the end-of-period outcome values between test treatment and placebo.

Recruiting

Decorative Caduceus

Blood Lymphocytes in Asthmatics Treated With Therapeutic Proteins

The investigators will compare lymphocyte counts in healthy controls to asthmatics on and off therapeutic proteins.

Recruiting

Decorative Caduceus

CF And Effects of Drugs Mixed Ex Vivo With Sputum for Mucolytic Treatment

Recruiting

Decorative Caduceus

The Effect of NAC on Lung Function and CT Mucus Score

The primary outcome is the % change in FEV1 from the start to the end of each two-week treatment period (either placebo or 20% NAC).

Recruiting

Decorative Caduceus

Mechanisms of Exacerbation of Asthma

Recruiting

Decorative Caduceus

Characterization of Adult Subjects for Asthmatic Research Studies

We will measure various indicators of airway inflammation and compare them with various phenotypic characteristics.

Recruiting

Decorative Caduceus

Characterizing Asthma Sputum Elasticity in the UCSF Severe Asthma Research Program

Lung function as a measure of asthma severity.

Recruiting

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