Cynthia Ashbrook, MD
Listed as an allergist, with a practice address in Walnut Creek, California.
Practice location 1
John Muir Physician Network
1450 Treat Blvd, Suite 160
Walnut Creek, CA 94597
From the records
- Specialty
- Allergist
- Records
- Medicare records: Family Practice (October 2026). Allergy specialty from the national provider registry.
- Medicare
- Accepts the Medicare-approved amount as payment in full (Medicare assignment), according to CMS’s file. This applies to Original Medicare; Medicare Advantage plans have their own networks. What assignment means
- Medical school
- University of South Carolina School of Medicine, graduated 1987 (Medicare records)
- Registry record
- Last updated May 2017
- NPI
- 1386786408 (national provider registry)
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From CMS’s Doctors and Clinicians file (October 2026) and the national provider registry, NPPES (October 2026). Listings are free and in alphabetical order; we don’t rate or recommend doctors. How we list doctors