Marsha Joellyn McKay, D.O.
Family Medicine Physician · Twain Harte, CA
Marsha Joellyn McKay, D.O. is a family medicine physician with a practice address in Twain Harte, California, and NPI 1558384206, issued on Jul 25, 2006. Check the license (California 20A5680, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Marsha Joellyn McKay
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A5680 CA
Self-reported in NPPES; status is on the state search - Practice location
- 18711 Tiffeni Dr, Twain Harte, CA 95383
- Phone
- (209) 586-2000
- Enumerated
- Jul 25, 2006
- Record last updated
- Jan 18, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (209) 586-2075
- Entity
- Type 1 · individual
Verify Marsha Joellyn McKay in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A5680Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2 family medicine physician records list a practice address in Twain Harte
They are 2 of the 26 NPPES records with a practice address in Twain Harte, and 17,133 family medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2 in Twain Harte → All 17,133 in California → Every provider in Twain Harte →
Other family medicine physician records in California
- Omer Aba-Omer, MDSanta Monica, CA1649702093
- Michelle Ababa, MDWilmington, CA1710922513
- Anna Tzeitel Abalos, MDRoseville, CA1720200017
- Adan Abarca, MDAnaheim, CA1760553689
- Vanessa Abarca, DOVentura, CA1952040859
- Lorraine Abate, M.D.Sacramento, CA1104840008
- Robert Abatecola, MDCastro Valley, CA1669551719
- Romeo Abaya, M.D.Cottonwood, CA1598053506
- Effiem Abbah, MD, MPHSan Francisco, CA1821185133
- Khuzeman Abbasi, MDSanta Rosa, CA1841979952
Common questions
What is Marsha Joellyn McKay, D.O.'s NPI number?
Marsha Joellyn McKay, D.O.'s National Provider Identifier (NPI) is 1558384206, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marsha Joellyn McKay, D.O. located?
The NPPES record lists a practice address at 18711 Tiffeni Dr, Twain Harte, CA, 95383. Phone: (209) 586-2000. Providers update this record themselves, so call before visiting.
How can I verify Marsha Joellyn McKay, D.O.'s license?
NPPES lists California license number 20A5680, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.