NADINE MARIE CALLAHAN M.D.
NPI 1194015511
Anesthesiology in Atlanta, GA
About Nadine Marie Callahan M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NADINE MARIE CALLAHAN M.D. (NPI 1194015511) is an individual anesthesiology provider in Atlanta, Georgia, licensed in Georgia (73246) and active in the NPI registry since April 2011. She is enrolled in Medicare PECOS, is affiliated with Emory Johns Creek Hospital, and is a graduate of Other (2011).
NPPES Registry Identity
Specialties & Licenses 2
Other Names 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Nadine Marie Callahan M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show Nadine Callahan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Atlanta, GA 30322
- Reassigned Medicare billing, Georgia enrollment
- 4,840 clinicians in this Medicare group
Atlanta, GA 30342
- Reassigned Medicare billing, Georgia enrollment
- 201 clinicians in this Medicare group
Lagrange, GA 30240
- Reassigned Medicare billing, Georgia enrollment
- 1,506 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Emory Johns Creek Hospital
Acute Care Hospitals · Johns Creek, GAMedicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
ATLANTA, GA 30322
ATLANTA, GA 30322
ATLANTA, GA 30322
ATLANTA, GA 30322
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 Nadine Callahan's NPI number?
The NPI number for Nadine Callahan is 1194015511. It was assigned to this individual provider in the NPPES registry on April 19, 2011. The provider is also known as Nadine Marie Gerhardstein.
Where is Nadine Callahan located?
Nadine Callahan practices at 1364 Clifton Rd NE, Atlanta, GA 30322. The listed phone number is (404) 778-3903.
What is Nadine Callahan's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Nadine Callahan enrolled in Medicare?
Yes. Nadine Callahan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Nadine Callahan's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nadine Callahan reassigns Medicare benefits to 3 organizations: The Emory Clinic Inc (Atlanta, GA), Concordia Anesthesiology, Inc (Atlanta, GA) and Emory Specialty Associates, LLC (Lagrange, GA). 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 Nadine Callahan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Nadine Callahan affiliated with any hospitals?
According to CMS data, Nadine Callahan is affiliated with Emory Johns Creek Hospital.
When was this NPI record last updated?
The NPPES record for Nadine Callahan was last updated on June 12, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Nadine Marie Callahan, M.D. · NPI 1194015511
Anesthesiology physician in Atlanta, Georgia. Individual provider, active in the CMS NPPES registry since April 19, 2011.
## Identity
- **NPI:** 1194015511 (Entity type: Individual)
- **Enumerated:** April 19, 2011
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 73246 (Georgia)
- **Sole proprietor:** No
## Practice location
- **Address:** 1364 CLIFTON RD NE, Atlanta, GA 30322-1059
- **Phone:** (404) 778-3903
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): The Emory Clinic Inc (NPI 1396798229, Atlanta, GA); Concordia Anesthesiology, Inc (NPI 1619296464, Atlanta, GA); Emory Specialty Associates, LLC (NPI 1407864168, Lagrange, GA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2011
## Record status
- **NPPES last updated:** June 12, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1194015511) · Data from the CMS NPPES public registry.