John Muir Perinatal Medical Group
NPI 1558397141 · Maternal & Fetal Medicine Physician · Walnut Creek, CA
John Muir Perinatal Medical Group is a Maternal & Fetal Medicine Physician organization in Walnut Creek, CA (NPI 1558397141).
Provider details
- NPI number
- 1558397141
- Entity type
- Organization
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Parent organization
- John Muir Physician Network
- Organization subpart
- Yes
- Authorized official
- M. Sorenson, Vice President(925) 952-2888
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
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
- 2006-06-24
- Last updated
- 2009-12-17
Frequently asked questions
- What is John Muir Perinatal Medical Group's NPI number?
- John Muir Perinatal Medical Group's National Provider Identifier (NPI) is 1558397141, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is John Muir Perinatal Medical Group?
- John Muir Perinatal Medical Group is classified in the NPPES registry as Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Muir Perinatal Medical Group located?
- John Muir Perinatal Medical Group's practice location on file with NPPES is 1656 N. Calfiornia Blvd., Walnut Creek, CA 94596.
- What is John Muir Perinatal Medical Group's phone number?
- The practice phone number listed in the NPPES registry for John Muir Perinatal Medical Group is (925) 941-7955.
- Who is the authorized official for John Muir Perinatal Medical Group?
- The authorized official listed on John Muir Perinatal Medical Group's NPPES record is M. Sorenson, Vice President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is John Muir Perinatal Medical Group's NPI active?
- Yes — John Muir Perinatal Medical Group's NPI (1558397141) is active in the NPPES registry as of the last update on 2009-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.