Kenneth Sack, MD
NPI 1538118765 · Internal Medicine Physician · San Francisco, CA
Kenneth Sack, MD is a Internal Medicine Physician provider in San Francisco, CA (NPI 1538118765).
Provider details
- NPI number
- 1538118765
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G28699 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-05-06
- Last updated
- 2025-09-11
Frequently asked questions
- What is Kenneth Sack's NPI number?
- Kenneth Sack's National Provider Identifier (NPI) is 1538118765, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kenneth Sack's specialty?
- Kenneth Sack is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kenneth Sack located?
- Kenneth Sack's practice location on file with NPPES is 400 Parnassus Ave, San Francisco, CA 94143-2202.
- What is Kenneth Sack's phone number?
- The practice phone number listed in the NPPES registry for Kenneth Sack is (415) 353-2497.
- Is Kenneth Sack's NPI active?
- Yes — Kenneth Sack's NPI (1538118765) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.