HealthCareAtlasUSA

This site republishes official CMS/Medicare Care Compare data. It is not medical advice and does not recommend any specific hospital or treatment — for medical decisions, talk to a doctor.

Doctors / CA

LUKEJOHN WELCH DAY, MD

GASTROENTEROLOGY

Medical school: STANFORD UNIVERSITY SCHOOL OF MEDICINE

Graduated: 2004

Also: INTERNAL MEDICINE

NPI: 1669623773

Practice Locations (2)

UCSF MEDICAL GROUP BUSINESS SERVICES

400 PARNASSUS AVE

SAN FRANCISCO, CA 941432202

UCSF MEDICAL GROUP BUSINESS SERVICES

450 STANYAN ST

SAN FRANCISCO, CA 941171019

4157505750

Source: CMS National Downloadable File, September 2026.

LUKEJOHN DAY, MD | HealthCareAtlasUSA