Marlene Grenon, M.D.
NPI 1124260534 · Surgery Physician · San Francisco, CA
Marlene Grenon, M.D. is a Surgery Physician provider in San Francisco, CA (NPI 1124260534).
Provider details
- NPI number
- 1124260534
- Entity type
- Individual
- Primary specialty
- Surgery PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 41320 (AZ)
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
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
- 2009-03-31
- Last updated
- 2010-02-10
Frequently asked questions
- What is Marlene Grenon's NPI number?
- Marlene Grenon's National Provider Identifier (NPI) is 1124260534, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marlene Grenon's specialty?
- Marlene Grenon is listed in the NPPES registry with a primary specialty of Surgery Physician (Allopathic & Osteopathic Physicians).
- Where is Marlene Grenon located?
- Marlene Grenon's practice location on file with NPPES is 400 Parnassus Ave, San Francisco, CA 94143-2202.
- What is Marlene Grenon's phone number?
- The practice phone number listed in the NPPES registry for Marlene Grenon is (415) 353-2357.
- Is Marlene Grenon's NPI active?
- Yes — Marlene Grenon's NPI (1124260534) is active in the NPPES registry as of the last update on 2010-02-10.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.