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

Dr. Marsha Joellyn McKay, DO

Individual provider Family Medicine Physician · NPI 1558384206

Dr. Marsha Joellyn McKay, DO is a Family Medicine Physician in Twain Harte, California. Practices as a sole proprietor. Licensed in California.

Licensed in
CA
In the registry since
2006
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 →

Practice location Address checks out

18711 Tiffeni Dr Ste 16
Twain Harte, CA 95383-9590
Phone: (209) 586-2000
Fax: (209) 586-2075
Show map & directions

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

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 20A5680 (CA)

Record details

NPI number1558384206
Entity typeIndividual (Type 1)
GenderFemale
Credentials DO
Sole proprietorYes
NPI enumeratedJuly 25, 2006
Last updated in NPPESJanuary 18, 2012

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