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Joseph Grenn, D.M.D.
NPI 1245446509 · Endodontics · San Francisco, CA
Joseph Grenn, D.M.D. is a Endodontics provider in San Francisco, CA (NPI 1245446509).
Provider details
- NPI number
- 1245446509
- Entity type
- Individual
- Primary specialty
- EndodonticsDental Providers
- Credential
- D.M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 22501 (CA)
Specialties & taxonomies
Dental Providers
Profile Score
Detailed profile(89/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
500 Spruce St
San Francisco, CA 94118-2648
Phone: (415) 221-2900
Fax: (415) 221-2950
Approximate (ZIP-level) locationGet directions
Mailing address
32 Great Circle Drive
Mill Valley, CA 94941-3217
Registry dates
- Enumerated
- 2007-05-15
- Last updated
- 2007-07-08
Frequently asked questions
- What is Joseph Grenn's NPI number?
- Joseph Grenn's National Provider Identifier (NPI) is 1245446509, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Grenn's specialty?
- Joseph Grenn is listed in the NPPES registry with a primary specialty of Endodontics (Dental Providers).
- Where is Joseph Grenn located?
- Joseph Grenn's practice location on file with NPPES is 500 Spruce St, San Francisco, CA 94118-2648.
- What is Joseph Grenn's phone number?
- The practice phone number listed in the NPPES registry for Joseph Grenn is (415) 221-2900.
- Is Joseph Grenn's NPI active?
- Yes — Joseph Grenn's NPI (1245446509) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.