Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Jay Donald Grassell, MD

Individual provider Family Medicine Physician · NPI 1821029687

Dr. Jay Donald Grassell, MD is a Hospitalist in Marysville, California. Graduated from Medical College of Wisconsin in 1981, 45 years ago. Practices with Galen Inpatient Physicians PC, a 1,031-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
45
Trained at
Medical College of Wisconsin
Licensed in
CA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

414 G St Ste 210
Marysville, CA 95901
Phone: (530) 741-1642
Fax: (530) 741-2056
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence G63050 (CA)
Family Medicine Physician Taxonomy 207Q00000X · Licence G063050 (CA)

Record details

NPI number1821029687
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 6, 2006
Last updated in NPPESNovember 19, 2021
Certification dateNovember 19, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHOSPITALIST
Also practisesFAMILY PRACTICE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 1981 (45 years in practice)
Group practice Galen Inpatient Physicians Pc — 1031 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Marysville