DR. KAREN MARY JOHNSON M.D.
NPI 1700942844
Psychiatry & Neurology - Psychiatry in Palo Alto, CA

Q: What is Karen Johnson's NPI number?

The NPI number for Karen Johnson is 1700942844. It was assigned to this individual provider in the NPPES registry on December 30, 2006.

Q: What is Karen Johnson's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Q: Is Karen Johnson enrolled in Medicare?

No. Karen Johnson has opted out of Medicare through September 4, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

Q: When was this NPI record last updated?

The NPPES record for Karen Johnson was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since December 30, 2006Opted out of Medicare · through Sep 4, 2027

550 HAMILTON AVE, SUITE 310, PALO ALTO, CA 94301(650) 325-8680(650) 325-2655 Get Directions Write a Review

NPPES record last updated: July 8, 2007. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Dr. Karen Mary Johnson M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. KAREN MARY JOHNSON M.D. (NPI 1700942844) is an individual psychiatry provider in Palo Alto, California, licensed in California (G035164) and active in the NPI registry since December 2006. She has opted out of Medicare through September 4, 2027 and remains eligible to order and refer.

NPPES Registry Identity

NPI1700942844

Entity TypeIndividualFemale

Primary Taxonomy2084P0800X

Provider Legal NameDR. KAREN MARY JOHNSONCredential: M.D.

Location Address550 HAMILTON AVE, SUITE 310Palo Alto, CA 94301-2010

Mailing Address550 Hamilton Ave, Suite 310Palo Alto, CA 94301-2010 · (650) 325-8680 · Fax (650) 325-2655

Phone(650) 325-8680

Fax(650) 325-2655

Sole ProprietorYes

Enumeration DateDecember 30, 2006

Last NPPES UpdateJuly 8, 2007

✔ NPI 1700942844 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in CA · G035164

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

550 HAMILTON AVE, Palo Alto, CA 94301

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Other Identifiers 1

Medicare UPINA46238CA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

ⓘ

Opted out of Medicare

Dr. Karen Mary Johnson M.d. has filed a Medicare opt-out affidavit. Services are provided under private contract between the provider and the patient, and are not billed to or reimbursed by Medicare. The opt-out is on file from September 4, 2017 through September 4, 2027.

Opt-Out Effective DateSeptember 4, 2017

Opt-Out In Effect ThroughSeptember 4, 2027Opt-out affidavits renew automatically every two years unless cancelled

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesAn opted-out provider can still order and refer for Medicare patients in the categories marked above, even though their own services are not covered.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 94301 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$206.04 typical visit price

range $70.37 – $206.04

Typical copayment $51.51 (range $17.59 – $51.51)

Most-billed visit code 99205

Established Patient

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

MS. CATE NELSON MFT

Marriage & Family Therapist

550 HAMILTON AVE, SUITE 210
PALO ALTO, CA 94301

Santa Clara County (650) 324-1109

MRS. ROCHELLE RONDINONE RN, MS, LMFT

Marriage & Family Therapist

550 HAMILTON AVE, SUITE 304
PALO ALTO, CA 94301

Santa Clara County (650) 872-5615

DR. BAHRAM KATOUZIAN PHD

Psychologist

550 HAMILTON AVE, SUITE 229
PALO ALTO, CA 94301

Santa Clara County (650) 330-0492

DR. JANICE D. MILL PH.D.

Psychologist

550 HAMILTON AVE, SUITE 240
PALO ALTO, CA 94301

Santa Clara County (650) 325-6834

HILA DEGANI PH.D.

Psychologist (Clinical)

550 HAMILTON AVE, 207
PALO ALTO, CA 94301

Santa Clara County (650) 380-6238

DR. JENNA REBECCA RINSKY PH.D.

Psychologist (Clinical)

550 HAMILTON AVE, SUITE 329
PALO ALTO, CA 94301

Santa Clara County (650) 464-7989

KATHERINE VIRET MFT

Marriage & Family Therapist

550 HAMILTON AVE, SUITE 110
PALO ALTO, CA 94301

Santa Clara County (650) 996-7960

DR. LEE GROSSMAN M.D.

Psychiatry & Neurology (Psychiatry)

550 HAMILTON AVE, SUITE 130
PALO ALTO, CA 94301

Santa Clara County (650) 327-1449

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Karen Johnson's NPI number?

The NPI number for Karen Johnson is 1700942844. It was assigned to this individual provider in the NPPES registry on December 30, 2006.

Where is Karen Johnson located?

Karen Johnson practices at 550 Hamilton Ave Suite 310, Palo Alto, CA 94301. The listed phone number is (650) 325-8680.

What is Karen Johnson's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Karen Johnson enrolled in Medicare?

No. Karen Johnson has opted out of Medicare through September 4, 2027. Care is provided under private contracts, and Medicare does not pay for services furnished by providers who have opted out. The provider remains eligible to order and refer services for Medicare patients.

When was this NPI record last updated?

The NPPES record for Karen Johnson was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.