Mary Johnston, MD
NPI 1881670958 · Geriatric Psychiatry Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Johnston, MD is a Geriatric Psychiatry Physician provider in Baltimore, MD (NPI 1881670958).
Provider details
- NPI number
- 1881670958
- Entity type
- Individual
- Primary specialty
- Geriatric Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- 9500105 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-12-20
- Last updated
- 2012-09-18
Frequently asked questions
- What is Mary Johnston's NPI number?
- Mary Johnston's National Provider Identifier (NPI) is 1881670958, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Johnston's specialty?
- Mary Johnston is listed in the NPPES registry with a primary specialty of Geriatric Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Johnston located?
- Mary Johnston's practice location on file with NPPES is 600 N Wolfe Street, Baltimore, MD 21287-7279.
- What is Mary Johnston's phone number?
- The practice phone number listed in the NPPES registry for Mary Johnston is (410) 955-5147.
- Does Mary Johnston accept Medicare?
- Mary Johnston is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Johnston's NPI active?
- Yes — Mary Johnston's NPI (1881670958) is active in the NPPES registry as of the last update on 2012-09-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.