Quick answers
- Where does Crystal M. Hayes see patients?
- Medicare's clinician data lists 4 practice locations, including San Mateo, CA. Call before your visit to confirm the address.
- What is Crystal M. Hayes's specialty?
- Medicare lists Registered Dietitian or Nutrition Professional as the primary specialty.
- Does Crystal M. Hayes accept Medicare assignment?
- Yes. Medicare's clinician data says Crystal M. Hayes accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is Crystal M. Hayes's NPI number?
- 1609402601. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Crystal M. Hayes is enrolled with Medicare (CMS data updated 2026-10-02).
- 22 W 39th AveSan Mateo, CA 94403
- 22 W 39th Ave, Hos316msSan Mateo, CA 94403
- 222 W 39th AveSan Mateo, CA 94403
- 222 W 39th Ave, Hos316msSan Mateo, CA 94403
Group practices
Medicare enrollment lists Crystal M. Hayes as a member of this group (CMS data updated 2026-10-02).
- County of San Mateo310 clinicians in the group
Specialties
Find other clinicians: Registered Dietitian or Nutrition Professional, California →
Other dietitians in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Medical school | Oregon Health Sciences University School Of Medicine |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609402601 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians