Margaret Johnstone, M.D.
NPI 1740221159 · Diagnostic Radiology Physician · Stony Brook, NY
Margaret Johnstone, M.D. is a Diagnostic Radiology Physician provider in Stony Brook, NY (NPI 1740221159).
Provider details
- NPI number
- 1740221159
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 114513 (NY)
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
- 2006-06-08
- Last updated
- 2007-07-08
Frequently asked questions
- What is Margaret Johnstone's NPI number?
- Margaret Johnstone's National Provider Identifier (NPI) is 1740221159, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Johnstone's specialty?
- Margaret Johnstone is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Johnstone located?
- Margaret Johnstone's practice location on file with NPPES is University Hospital, L4, Stony Brook, NY 11794-0001.
- What is Margaret Johnstone's phone number?
- The practice phone number listed in the NPPES registry for Margaret Johnstone is (631) 444-6920.
- Is Margaret Johnstone's NPI active?
- Yes — Margaret Johnstone's NPI (1740221159) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.