Kimberly Grelli, MD
NPI 1255758512 · Neonatal-Perinatal Medicine Physician · Walnut Creek, CA
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Kimberly Grelli, MD is a Neonatal-Perinatal Medicine Physician provider in Walnut Creek, CA (NPI 1255758512).
Provider details
- NPI number
- 1255758512
- Entity type
- Individual
- Primary specialty
- Neonatal-Perinatal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A147133 (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
12 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
3 documented practice locations
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
Additional practice locations (2)
- 725 Welch RdPalo Alto, CA 94304-1601Phone: (650) 497-8000
- Po Box 734San Francisco, CA 94104-0734Phone: (415) 502-8231
Registry dates
- Enumerated
- 2014-03-25
- Last updated
- 2025-10-31
- Certified
- 2025-10-31
Frequently asked questions
- What is Kimberly Grelli's NPI number?
- Kimberly Grelli's National Provider Identifier (NPI) is 1255758512, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Kimberly Grelli's specialty?
- Kimberly Grelli is listed in the NPPES registry with a primary specialty of Neonatal-Perinatal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Kimberly Grelli located?
- Kimberly Grelli's practice location on file with NPPES is 1601 Ygnacio Valley Rd, Walnut Creek, CA 94598-3122.
- What is Kimberly Grelli's phone number?
- The practice phone number listed in the NPPES registry for Kimberly Grelli is (925) 947-5350.
- Does Kimberly Grelli accept Medicare?
- Kimberly Grelli is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Kimberly Grelli's NPI active?
- Yes — Kimberly Grelli's NPI (1255758512) is active in the NPPES registry as of the last update on 2025-10-31.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.