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JOHN D GRATTAN-SMITH MD
NPI 1548234933
Radiology - Diagnostic Radiology in Marietta, GA

Active since February 14, 2006PECOS Enrolled
790 CHURCH ST NE STE 400, MARIETTA, GA 30060(770) 405-2976(770) 988-0730 Get Directions Write a Review

NPPES record last updated: July 30, 2026. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jul 30, 2026, Jan 8, 2021 (2 updates tracked since 2021).

About John D Grattan-smith Md NPPES

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

JOHN D GRATTAN-SMITH MD (NPI 1548234933) is an individual diagnostic radiology provider in Marietta, Georgia, licensed in Georgia (038237) and active in the NPI registry since February 2006. He is enrolled in Medicare PECOS and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1548234933
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameJOHN D GRATTAN-SMITHCredential: MD
Location Address790 CHURCH ST NE STE 400Marietta, GA 30060-8957
Mailing AddressPo Box 3157Indianapolis, IN 46206-3157 · (770) 405-2976
Phone(770) 405-2976
Fax(770) 988-0730
Sole ProprietorNo
Enumeration DateFebruary 14, 2006
Last NPPES UpdateJuly 30, 20262 updates tracked since enumeration
NPPES CertifiedJanuary 12, 2024
✔ NPI 1548234933 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in GA · 038237
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
Also ListedRadiology · Pediatric RadiologyTaxonomy 2085P0229X · License 61912 (TN), 038237 (GA)
790 CHURCH ST NE STE 400, Marietta, GA 30060
Open in Google Maps ↗

Secondary Practice Locations 2

Location 11001 Johnson Fy Rd NESandy Springs, GA 30342-1605 · Phone (404) 785-2162
Location 2262 Danny Thomas PlMemphis, TN 38105-3678 · Phone (888) 226-4343

Other Identifiers 1

Medicaid000615733GA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Alliant Health Plans, Inc., Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

John D Grattan-smith 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.

Medicare Billing Reassignments

4

Medicare enrollment records show John Grattan-smith reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Quantum Radiology, PC
Same address
Diagnostic Radiology
790 CHURCH ST NE, STE 400
Marietta, GA 30060
  • Reassigned Medicare billing, Georgia enrollment
  • 96 clinicians in this Medicare group
NPI 1366495988 (678) 581-3830
Children's Diagnostic Imaging Of Atlanta
12 mi
Pediatric Radiology
1001 JOHNSON FERRY RD NE
Atlanta, GA 30342
  • Reassigned Medicare billing, Georgia enrollment
  • 8 clinicians in this Medicare group
NPI 1972555662 (404) 785-2162
St Jude Children's Research Hospital, Inc.
324 mi
Pediatrics
262 DANNY THOMAS PL
Memphis, TN 38105
  • Reassigned Medicare billing, Tennessee enrollment
  • Medicare enrollment name: St Jude Childrens Research Hospital Inc
  • 367 clinicians in this Medicare group
NPI 1306335088 (901) 595-3300
University Of Pittsburgh Physicians
507 mi
Internal Medicine
1100 WASHINGTON AVE, SUITE 115
Carnegie, PA 15106
  • Reassigned Medicare billing, Pennsylvania enrollment
  • 7,114 clinicians in this Medicare group
NPI 1053595942 (412) 279-8940

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 30060 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
$88.06 typical visit price
range $56.84 – $172.43
Typical copayment $22.01 (range $14.21 – $43.10)
Most-billed visit code 99203
Established Patient
$70.85 typical visit price
range $18.22 – $140.40
Typical copayment $17.71 (range $4.55 – $35.10)
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.

DR. CHRIS CHAN MOO SUNG
Radiology (Vascular & Interventional Radiology)
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976
DR. THOMAS PATRICK MURPHY M.D.
Radiology (Vascular & Interventional Radiology)
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976
NANCY CHIOMA OKECHUKWU M.D.
Radiology (Diagnostic Radiology)
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (678) 239-0420
DEBORAH LINDQUESTER
Physician Assistant
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 514-2776
ERIN MICHELE BRANDOW PA
Physician Assistant
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976
PATRICIA CHU MULDER PA
Physician Assistant
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976
DR. ELAINE GRACE KHATOD M.D.
Radiology (Diagnostic Radiology)
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976
TIMOTHY STEVENS HANES M.D.
Radiology (Diagnostic Radiology)
790 CHURCH ST NE STE 400
MARIETTA, GA 30060
Cobb County (770) 405-2976

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 John Grattan-smith's NPI number?

The NPI number for John Grattan-smith is 1548234933. It was assigned to this individual provider in the NPPES registry on February 14, 2006.

Where is John Grattan-smith located?

John Grattan-smith practices at 790 Church St NE Ste 400, Marietta, GA 30060. The listed phone number is (770) 405-2976.

What is John Grattan-smith's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is John Grattan-smith enrolled in Medicare?

Yes. John Grattan-smith is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for John Grattan-smith's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Grattan-smith reassigns Medicare benefits to 4 organizations: Quantum Radiology, PC (Marietta, GA), Children's Diagnostic Imaging Of Atlanta (Atlanta, GA), St Jude Children's Research Hospital, Inc. (Memphis, TN) and University Of Pittsburgh Physicians (Carnegie, PA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Grattan-smith's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does John Grattan-smith accept?

Health plans from Alliant Health Plans, Inc. and Oscar Health list John Grattan-smith as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for John Grattan-smith was last updated on July 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.