Karen Mary Johnson, M.D.
Psychiatry Physician · Palo Alto, CA
Karen Mary Johnson, M.D. is a psychiatry physician with a practice address in Palo Alto, California, and NPI 1700942844, issued on Dec 30, 2006. Check the license (California G035164, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Karen Mary Johnson
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- G035164 CA
Self-reported in NPPES; status is on the state search - Practice location
- 550 Hamilton Ave, Palo Alto, CA 94301
- Phone
- (650) 325-8680
- Enumerated
- Dec 30, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (650) 325-2655
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 8,673 in California → Look up another NPI →
Also registered at 550 Hamilton Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Diana Adams, ED.D.Psychologist1780732206
- Taylor Chesney, PSY.DStudent in an Organized Health Care Education/Training Program1801132865
- Hila Degani, PH.D.Clinical Psychologist1245372218
- Katherine Devaul, M.D.Psychiatry Physician1659383636
- Kathryn Dewitt, PH.D.Clinical Psychologist1871637983
- Jennifer Dore, MDPsychiatry Physician1750540589
Verify Karen Mary Johnson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G035164Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
93% fewer Medicare Part D claims than the average psychiatry physician in 2024
73 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Duloxetine Hcl17 claims
- Bupropion Xl15 claims
- Vilazodone Hcl13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Karen Mary Johnson among 8,673 psychiatry physician records in California
Karen Mary Johnson, M.D. is one of 8,673 psychiatry physician records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 67% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileNo · 38% of these records are
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
215 psychiatry physician records list a practice address in Palo Alto
They are 215 of the 7,617 NPPES records with a practice address in Palo Alto, and 8,673 psychiatry physician records in California.
All 8,673 in California → Every provider in Palo Alto → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Ulka Agarwal, MDPalo Alto, CA 943011689684151
- Richard Corelli, M.D.Palo Alto, CA 943011912995507
- Katherine Devaul, M.D.Palo Alto, CA 943011659383636
- Perrin French, MDPalo Alto, CA 943011780762369
- Shirin Hoodei, M.D.Palo Alto, CA 943011184714610
- Gale Hylton, MDPalo Alto, CA 943011043321367
- Gloria Kardong, MDPale Alto, CA 943011386707131
- Nan Link, MDPalo Alto, CA 943011720199052
Common questions
What is Karen Mary Johnson, M.D.'s NPI number?
Karen Mary Johnson, M.D.'s National Provider Identifier (NPI) is 1700942844, issued on Dec 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen Mary Johnson, M.D. located?
The NPPES record lists a practice address at 550 Hamilton Ave, Palo Alto, CA, 94301. Phone: (650) 325-8680. Providers update this record themselves, so call before visiting.
How can I verify Karen Mary Johnson, M.D.'s license?
NPPES lists California license number G035164, 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.
How much does Karen Mary Johnson, M.D. prescribe under Medicare Part D?
In 2024, Karen Mary Johnson, M.D. had 73 Medicare Part D claims; the average among psychiatry physician prescribers was 1,000. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 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.
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.