Locations and Contact Information

Please contact one of our offices directly at your location of choice listed below on this page.
Maps and directions are also included below.

You can also inquire or request an appointment via our secure online form at any time.

APPOINTMENT REQUEST FORM

For Other Requests & Inquiries

Please call one of our offices directly for your scheduling and other inquiries. You can also use our online form to reach out to us for requests like questions, medication refills, lab test results, and medical records. Please know that this form is only available as a convenience and should not be used for any urgent matters whatsoever. Additionally, we cannot guarantee Internet functionality and circumstances surrounding your submitted requests. Therefore, always contact 911, your medical professional, or one of our offices directly via phone depending on your needs.

INQUIRIES & REQUESTS FORM

For more information, see our Frequently Asked Questions or What to Expect sections for answers to our most commonly asked concerns.

Patient Forms

Coming Soon...

Phone and Office Hours
Location	Allergists	Day & Times
2100 Webster # 329 (Pacific Heights)	Katharine Fast, MD	Mondays through Fridays: 8:00 am - 5:00 pm
450 Sutter # 1139 (Union Square)	Opal Gupta, MD	Mondays through Fridays: 8:00 am - 5:00 pm
450 Sutter # 1404 (Union Square)	James Piepergerdes, MD	Mondays through Fridays: 8:00 am - 5:00 pm
180 Montgomery Street # 2370	Jeffrey M. Davidson, MD	Mondays: 9 am - 5 pm Tuesdays: 2 pm - 7 pm Wednesdays: CLOSED Thursdays: 11 am - 7 pm Fridays: 9 am - 5 pm *We are out for lunch from 1 pm - 2 pm

Clinic Hours
Location	Allergists	Day & Times
2100 Webster # 329 (Pacific Heights)	Katharine Fast, MD	Mondays through Thursdays: 9:00 am - 3:00 pm
450 Sutter # 1139 (Union Square)	Opal Gupta, MD	Mondays through Thursdays: 8:00 am - 3:30 pm (Closed for lunch from 12:00 pm - 1:00 pm)
450 Sutter # 1404 (Union Square)	James Piepergerdes, MD	Monday: 9:00 am - 3:00 pm (Closed for lunch from 1:00 pm - 2:00 pm) Tuesday: 8:30 am - 12:00 pm Wednesday: 9:00 am - 3:00 pm (Closed for lunch from 1:00 pm - 2:00 pm) Thursday: 8:30 am - 12:00 pm Friday: 9:00 am - 3:00 pm (Closed for lunch from 1:00 pm - 2:00 pm)
180 Montgomery Street # 2370	Jeffrey M. Davidson, MD	Mondays: 9 am - 5 pm Tuesdays: 2 pm - 7 pm Wednesdays: CLOSED Thursdays: 11 am - 7 pm Fridays: 9 am - 5 pm *We are out for lunch from 1 pm - 2 pm

Shot Hours Shot Holidays (closed for shots): MLK Day and Presidents Day
Location	Allergists	Day & Times
2100 Webster # 329 (Pacific Heights)	Katharine Fast, MD	Monday: 9:00 am - 11:00 am Wednesday: 9:00 am - 11:00 am
450 Sutter # 1139 (Union Square)	Opal Gupta, MD Katharine Fast, MD	Monday: 9:00 am - 12:00 pm and 2:00 pm - 3:00 pm Wednesday: 9:00 am - 12:00 pm and 2:00 pm - 3:00 pm
450 Sutter # 1404 (Union Square)	James Piepergerdes, MD	Monday: 9:00 am - 12:00 pm and 2:00 pm - 3:00 pm Wednesday: 9:00 am - 12:00 pm and 2:00 pm - 3:00 pm Friday: 9:00 am - 12:00 pm
180 Montgomery Street # 2370	Jeffrey M. Davidson, MD	Click here for shot hours