Lukejohn Day, M.D.
NPI 1669623773 · Gastroenterology Physician · San Francisco, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Lukejohn Day, M.D. is a Gastroenterology Physician provider in San Francisco, CA (NPI 1669623773).
Provider details
- NPI number
- 1669623773
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- A93534 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
17 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-10-07
- Last updated
- 2008-10-07
Frequently asked questions
- What is Lukejohn Day's NPI number?
- Lukejohn Day's National Provider Identifier (NPI) is 1669623773, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Lukejohn Day's specialty?
- Lukejohn Day is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Lukejohn Day located?
- Lukejohn Day's practice location on file with NPPES is 505 Parnassus Ave, San Francisco, CA 94143-2204.
- What is Lukejohn Day's phone number?
- The practice phone number listed in the NPPES registry for Lukejohn Day is (415) 377-2176.
- Does Lukejohn Day accept Medicare?
- Lukejohn Day is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Lukejohn Day's NPI active?
- Yes — Lukejohn Day's NPI (1669623773) is active in the NPPES registry as of the last update on 2008-10-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.