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

Monica Nicole Gaines Stiles, DO

Individual provider Hospitalist Physician · NPI 1811524507

Monica Nicole Gaines Stiles, DO is a Hospitalist in Walnut Creek, California. Qualified in 2020, 6 years ago. Practices with John Muir Physician Network, a 486-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California.

Years since qualifying
6
Licensed in
CA
In the registry since
2020
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1601 Ygnacio Valley Rd
Walnut Creek, CA 94598-3122
Phone: (925) 947-3393
Fax: (925) 947-3396
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 (2)

  • 2700 Grant St Ste 200, Concord, CA 94520-2270 — (925) 947-3312
  • 2540 East St, Concord, CA 94520-1906 — (925) 674-2609

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 20A20496 (CA)

Record details

NPI number1811524507
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorNo
NPI enumeratedMarch 24, 2020
Last updated in NPPESJune 18, 2026
Certification dateJune 18, 2026

Medicare enrollment

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

Medicare specialtyHOSPITALIST
Medical schoolOTHER
Graduated 2020 (6 years in practice)
Group practice John Muir Physician Network — 486 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients202
Services billed 632 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at John Muir Physician Network

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 486 clinicians in the practice; 12 are shown here.

Other providers in Walnut Creek