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

Dr. Erin Elizabeth Farrelly, MD, MS

Individual provider Orthopaedic Trauma Physician · NPI 1922354422

Dr. Erin Elizabeth Farrelly, MD, MS is an Orthopedic Surgery in San Marcos, California. Graduated from George Washington University School of Medicine in 2007, 19 years ago. Practices with Medstar Medical Group II LLC, a 3,717-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
19
Trained at
George Washington University School of Medicine
Licensed in
CA
In the registry since
2012
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MS — Master of Science
A graduate science degree.

See every abbreviation used in this directory →

Practice location Address checks out

277 Rancheros Dr Ste 101
San Marcos, CA 92069-2976
Phone: (760) 750-1902
Fax: (760) 750-1906
Show map & directions

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

Specialties & licences

Orthopaedic Surgery Physician (primary) Taxonomy 207X00000X · Licence A121731 (CA)
Orthopaedic Trauma Physician Taxonomy 207XX0801X · Licence A121731 (CA)

Record details

NPI number1922354422
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , MS
Sole proprietorNo
NPI enumeratedAugust 2, 2012
Last updated in NPPESJanuary 6, 2021
Certification dateJanuary 6, 2021

Medicare enrollment

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

Medicare specialtyORTHOPEDIC SURGERY
Medical schoolGEORGE WASHINGTON UNIVERSITY SCHOOL OF MEDICINE
Graduated 2007 (19 years in practice)
Group practice Medstar Medical Group Ii Llc — 3717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations9 on file with Medicare