Lukejohn DayM.D.
Gastroenterology·San Francisco, CA
Lukejohn Day, M.D. is a Gastroenterology provider in San Francisco, CA affiliated with 2 ambulatory surgery centers in CA, as of July 2026.
- NPI1669623773
- Registered2008
- Centers2
- StateCA
- Class of2004
Case volumes, referral patterns, and payer mix live in DataLily AI Insights.
Ambulatory surgery centers
Centers whose service lines match this provider’s. Affiliations change; verify independently.
Education
Education on record as of August 2026.
Lukejohn Day at a glance
- Provider
- Lukejohn Day
- Credential
- M.D.
- Specialty
- Gastroenterology
- Procedures
- Gastroenterology CPT codes
- Location
- San Francisco, CA
- Medical school
- Stanford University School of Medicine
- Graduated
- 2004
- NPI registered
- 2008
- NPI
- 1669623773
- Snapshot
- July 2026
Identity, specialty, and affiliations change over time. This is not an endorsement, and not clinical, billing, or legal advice. Providers may request corrections at founders@datalilyai.com. Read the DataLily AI data methodology.
Questions
Where does Lukejohn Day practice?
Lukejohn Day, M.D. is based in San Francisco, CA and is affiliated with 2 ambulatory surgery centers: Golden Gate Endoscopy Center LLC in San Francisco, CA and San Francisco Endoscopy Center LLC in San Francisco, CA. Affiliations reflect the current DataLily AI snapshot (July 2026) and can change.
What is Lukejohn Day's NPI number?
Lukejohn Day's National Provider Identifier (NPI) is 1669623773, registered in 2008. Specialty on record: Gastroenterology; credential M.D.
Where did Lukejohn Day go to medical school?
Lukejohn Day, M.D. attended Stanford University School of Medicine, graduating in 2004.
How many Gastroenterology providers in California work at ambulatory surgery centers?
547 Gastroenterology surgeons and proceduralists in California are affiliated with ambulatory surgery centers in DataLily AI's current snapshot, Lukejohn Day among them. The California Gastroenterology directory lists each one by city with credential, NPI, and center affiliations.
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