John Grattan-Smith, MD
NPI 1548234933 · Diagnostic Radiology Physician · Marietta, GA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Grattan-Smith, MD is a Diagnostic Radiology Physician provider in Marietta, GA (NPI 1548234933).
Provider details
- NPI number
- 1548234933
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 61912 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
20 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
3 documented practice locations
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$18 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 1001 Johnson Ferry Rd NeAtlanta, GA 30342-1605Phone: (404) 785-2162
- 262 Danny Thomas PlMemphis, TN 38105-3678Phone: (888) 226-4343
Registry dates
- Enumerated
- 2006-02-14
- Last updated
- 2024-01-12
- Certified
- 2024-01-12
Frequently asked questions
- What is John Grattan-Smith's NPI number?
- John Grattan-Smith's National Provider Identifier (NPI) is 1548234933, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Grattan-Smith's specialty?
- John Grattan-Smith is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is John Grattan-Smith located?
- John Grattan-Smith's practice location on file with NPPES is 790 Church St Ne Ste 400, Marietta, GA 30060-8957.
- What is John Grattan-Smith's phone number?
- The practice phone number listed in the NPPES registry for John Grattan-Smith is (770) 405-2976.
- Does John Grattan-Smith accept Medicare?
- John Grattan-Smith is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Grattan-Smith's NPI active?
- Yes — John Grattan-Smith's NPI (1548234933) is active in the NPPES registry as of the last update on 2024-01-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.