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

Dr. Mariel Muriel Pastrana, MD

Individual provider Internal Medicine Physician · NPI 1538488580

Dr. Mariel Muriel Pastrana, MD is an Internal Medicine in Walnut Creek, California. Graduated from Ponce School of Medicine in 2010, 16 years ago. Practices with Graybill Medical Group Inc, a 104-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
16
Trained at
Ponce School of Medicine
Licensed in
CA
In the registry since
2010
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1220 Rossmoor Pkwy
Walnut Creek, CA 94595-2501
Phone: (925) 947-3393
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 2185 Citracado Pkwy, Escondido, CA 92029-4159 — (760) 291-6700

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A127358 (CA)

Record details

NPI number1538488580
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 28, 2010
Last updated in NPPESJanuary 29, 2025
Certification dateJanuary 29, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolPONCE SCHOOL OF MEDICINE
Graduated 2010 (16 years in practice)
Group practice Graybill Medical Group Inc — 104 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Walnut Creek