Karen Johnston, MD
Anatomic Pathology & Clinical Pathology Physician · Palo Alto, CA
Karen Johnston, MD is an anatomic pathology & clinical pathology physician with a practice address in Palo Alto, California, and NPI 1326518325, issued on Dec 3, 2018. Check the license (California G67445, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Johnston
- Credential
- MD
- Primary taxonomy
- Anatomic Pathology & Clinical Pathology Physician 207ZP0102X
- License number
- G67445 CA
Self-reported in NPPES; status is on the state search - Practice location
- 478 E Charleston RD, Palo Alto, CA 94306
- Phone
- (650) 380-9149
- Enumerated
- Dec 3, 2018
- Entity
- Type 1 · individual
Verify Karen Johnston in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G67445Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
The practice group's Medicare quality score for 2023: 95.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital or facility affiliation
- Wound MD PCBurlingame, CA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Anatomic Pathology & Clinical Pathology Physician providers in California
There are 1,183 anatomic pathology & clinical pathology physician records in California.
Other anatomic pathology & clinical pathology physician records in California
- Sophie Aalaei, M.D.San Diego, CA1558454207
- Joline Abrahams, M.D.Palm Springs, CA1679567366
- Guillermo Acero, MDOjai, CA1629144373
- Dennis Adams, M.D.Stanford, CA1053726182
- Alaa Afify, M.D.Sacramento, CA1245212950
- Ali Afsari, M.D.Orange, CA1275064362
- Mukesh AgarwalColton, CA1154901056
- Chandnish Ahluwalia, M.D.Glendale, CA1508850421
- Sanaz Ainechi, MDPasadena, CA1710329883
- Omonigho Aisagbonhi, MD, PHDSan Diego, CA1043571045
Common questions
What is Karen Johnston, MD's NPI number?
Karen Johnston, MD's National Provider Identifier (NPI) is 1326518325, issued on Dec 3, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Karen Johnston, MD located?
The NPPES record lists a practice address at 478 E Charleston RD, Palo Alto, CA, 94306. Phone: (650) 380-9149. Providers update this record themselves, so call before visiting.
How can I verify Karen Johnston, MD's license?
NPPES lists California license number G67445, 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.
What is Karen Johnston, MD's Medicare quality score?
The 2023 MIPS final score is 95.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.