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MARY DEIRDRE JOHNSTON MD
NPI 1881670958
Psychiatry & Neurology - Geriatric Psychiatry in Baltimore, MD

Active since December 20, 2005PECOS Enrolled
600 N WOLFE STREET, JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINE, BALTIMORE, MD 21287(410) 955-5147 Get Directions Write a Review

NPPES record last updated: September 18, 2012. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Mary Deirdre Johnston Md NPPES

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

MARY DEIRDRE JOHNSTON MD (NPI 1881670958) is an individual geriatric psychiatry provider in Baltimore, Maryland, licensed in North Carolina (9500105) and active in the NPI registry since December 2005. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1881670958
Entity TypeIndividualFemale
Primary Taxonomy2084P0805X
Provider Legal NameMARY DEIRDRE JOHNSTONCredential: MD
Location Address600 N WOLFE STREET, JOHNS HOPKINS UNIVERSITY SCHOOL OF MEDICINEBaltimore, MD 21287-7279
Mailing Address9910 Franklin Square Drive Suite 2110, Johns Hopkins University Reimbursement CoordinatorWhite Marsh, MD 21236-4902 · (410) 933-2718
Phone(410) 955-5147
Sole ProprietorNo
Enumeration DateDecember 20, 2005
Last NPPES UpdateSeptember 18, 2012
✔ NPI 1881670958 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Geriatric PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0805X
License✔ Licensed in NC · 9500105
Definition
Geriatric Psychiatry is a subspecialty with psychiatric expertise in prevention, evaluation, diagnosis and treatment of mental and emotional disorders in the elderly, and improvement of psychiatric care for healthy and ill elderly patients.
600 N WOLFE STREET, Baltimore, MD 21287
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Other Identifiers 2

Medicare ID-Type Unspecified2215758ANC
Medicare UPING22057

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mary Deirdre Johnston Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21287 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
$183.44 typical visit price
range $60.73 – $183.44
Typical copayment $45.86 (range $15.18 – $45.86)
Most-billed visit code 99205
Established Patient
$106.59 typical visit price
range $19.60 – $149.17
Typical copayment $26.64 (range $4.90 – $37.29)
Most-billed visit code 99214
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.

DR. WHITNEY ERIN PARKER MD, PHD
Neurological Surgery
600 N WOLFE STREET, PHIPPS 554
BALTIMORE, MD 21287
Baltimore City (410) 955-7851
RACHEL AARON PHD
Psychologist (Clinical)
600 N WOLFE STREET, MEYER 163
BALTIMORE, MD 21287
Baltimore City (410) 614-4030
ALLISON WEAVER MD
Internal Medicine
600 N WOLFE STREET, MEYER 8-134
BALTIMORE, MD 21287
Baltimore City (410) 614-4474
DR. JANA CHRISTIAN MD
Internal Medicine
600 N WOLFE STREET, MEYER 8-134
BALTIMORE, MD 21287
Baltimore City (410) 614-4474
JESINTHA STEPHENSON MD
Hospitalist
600 N WOLFE STREET, MEYER 8-134
BALTIMORE, MD 21287
Baltimore City (410) 614-4474
HAMILTON MOSES III M.D.
Psychiatry & Neurology (Neurology)
600 N WOLFE STREET, THE JOHNS HOPKINS HOSPITAL
BALTIMORE, MD 21287
Baltimore City (434) 984-2016
DR. GERARD LIMERICK MD
Physical Medicine & Rehabilitation
600 N WOLFE STREET, NELSON 2-131
BALTIMORE, MD 21287
Baltimore City (410) 955-1818
DR. COLIN KANE OD
Optometrist
600 N WOLFE STREET, WILMER 233
BALTIMORE, MD 21287
Baltimore City (410) 955-8679

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 Mary Johnston's NPI number?

The NPI number for Mary Johnston is 1881670958. It was assigned to this individual provider in the NPPES registry on December 20, 2005.

Where is Mary Johnston located?

Mary Johnston practices at 600 N Wolfe Street Johns Hopkins University School Of Medicine, Baltimore, MD 21287. The listed phone number is (410) 955-5147.

What is Mary Johnston's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Geriatric Psychiatry, with taxonomy code 2084P0805X.

Is Mary Johnston enrolled in Medicare?

Yes. Mary Johnston is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Mary Johnston was last updated on September 18, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.