BARBARA O'CALLAGHAN RN, NP
NPI 1003041104
Registered Nurse - Oncology in Lawrenceville, GA

Q: What is Barbara O'callaghan's NPI number?

The NPI number for Barbara O'callaghan is 1003041104. It was assigned to this individual provider in the NPPES registry on May 19, 2009.

Q: What is Barbara O'callaghan's specialty?

The primary specialty registered for this NPI is Registered Nurse, specializing in Oncology, with taxonomy code 163WX0200X.

Active since May 19, 2009PECOS EnrolledAccepts Medicare Assignment

631 PROFESSIONAL DRIVE, 450, LAWRENCEVILLE, GA 30046(770) 963-8030(770) 339-9577 Get Directions Write a Review

NPPES record last updated: February 3, 2010. Verified against the NPPES registry weekly; last sync: October 18, 2026.

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About Barbara O'callaghan Rn, Np NPPES

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

BARBARA O'CALLAGHAN RN, NP (NPI 1003041104) is an individual oncology provider in Lawrenceville, Georgia, licensed in Georgia (RN139570) and active in the NPI registry since May 2009. She is enrolled in Medicare PECOS, is affiliated with Northside Hospital, and is a graduate of Other (2008).

NPPES Registry Identity

NPI1003041104

Entity TypeIndividualFemale

Primary Taxonomy163WX0200X

Provider Legal NameBARBARA O'CALLAGHANCredential: RN, NP

Location Address631 PROFESSIONAL DRIVE, 450Lawrenceville, GA 30046-7651

Mailing Address651 Carroll's WayBuford, GA 30518

Phone(770) 963-8030

Fax(770) 339-9577

Sole ProprietorNo

Medical School CMSOtherGraduated 2008

Enumeration DateMay 19, 2009

Last NPPES UpdateFebruary 3, 2010

✔ NPI 1003041104 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRegistered Nurse · OncologyNursing Service Providers

Taxonomy Code163WX0200X

License✔ Licensed in GA · RN139570

631 PROFESSIONAL DRIVE, Lawrenceville, GA 30046

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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

Barbara O'callaghan Rn, Np 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.

PECOS PAC ID941332738

PECOS Enrollment IDI20100714000353

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

Medicare enrollment records show Barbara O'callaghan reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Suburban Hematology Oncology Associates, PC

Same address

Hematology & Oncology

631 PROFESSIONAL DRIVE, SUITE 450
Lawrenceville, GA 30046

Reassigned Medicare billing, Georgia enrollment
3 clinicians in this Medicare group

NPI 1508926759 (770) 963-8030

North Atlanta Oncology Services LLC

Same address

Medical Oncology

631 PROFESSIONAL DR STE 450
Lawrenceville, GA 30046

Reassigned Medicare billing, Georgia enrollment
31 clinicians in this Medicare group

NPI 1871055434 (855) 709-4535

Northside Hospital, Inc.

0.1 mi

General Acute Care Hospital

1000 MEDICAL CENTER BLVD
Lawrenceville, GA 30046

Reassigned Medicare billing, Georgia enrollment
Medicare enrollment name: Gwinnett Hospital System, Inc.
98 clinicians in this Medicare group

NPI 1952340994 (678) 312-1000

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

Areas of Expertise CMS Part B claims 4

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

165 services90 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

145 services82 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

67 services54 patients

Prolonged office or other outpatient evaluation and management service(s) beyond the maximum required time of the primary procedure which has been selected using total time on the date of the primary service; each additional 15 minutes by the physician or G2212

This service refers to extended doctor visits where your healthcare provider spends additional time evaluating and managing your health beyond the primary procedure's required time. This includes each extra 15 minutes spent by the physician on the same day as the primary service.

29 services20 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northside Hospital

Acute Care Hospitals · Atlanta, GA

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number110161

Location1000 Johnson Ferry Road, NEAtlanta, GA 30342 · Fulton County

Birthing friendly

Northside Hospital Duluth

Acute Care Hospitals · Duluth, GA

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number110252

Location3620 Howell Ferry RoadDuluth, GA 30096 · Gwinnett County

Emergency services Birthing friendly

Other Providers at the Same Location NPPES 13

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

HUGHSTON CLINIC PC

Durable Medical Equipment & Medical Supplies

631 PROFESSIONAL DRIVE, SUITE 170
LAWRENECEVILLE, GA 30046

Gwinnett County (678) 312-2663

DR. ALEXANDER SAKER JR. M.D.

Internal Medicine (Hematology & Oncology)

631 PROFESSIONAL DRIVE, SUITE 450
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 963-8030

SATVIR SINGH M.D.

Internal Medicine (Hematology & Oncology)

631 PROFESSIONAL DRIVE, SUITE 450
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 963-8030

WALLACE FORD MARTIN MD

Surgery

631 PROFESSIONAL DRIVE, SUITE 300
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 962-9977

SUBURBAN HEMATOLOGY ONCOLOGY ASSOCIATES, PC

Internal Medicine (Hematology & Oncology)

631 PROFESSIONAL DRIVE, SUITE 450
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 963-8030

SUDHINDRA K ANEGUNDI MD

Surgery (Vascular Surgery)

631 PROFESSIONAL DRIVE, SUITE 300
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 962-9977

JOHN A. CHANDLER PA

Physician Assistant (Surgical)

631 PROFESSIONAL DRIVE, SUITE 200
LAWRENCEVILLE, GA 30046

Gwinnett County (770) 579-1894

DR. CHRISTOPHER T HAGENSTAD M.D.

Internal Medicine (Hematology & Oncology)

631 PROFESSIONAL DRIVE, STE 210
LAWRENCEVILLE, GA 30046

Gwinnett County (678) 312-3235

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 Barbara O'callaghan's NPI number?

The NPI number for Barbara O'callaghan is 1003041104. It was assigned to this individual provider in the NPPES registry on May 19, 2009.

Where is Barbara O'callaghan located?

Barbara O'callaghan practices at 631 Professional Drive 450, Lawrenceville, GA 30046. The listed phone number is (770) 963-8030.

What is Barbara O'callaghan's specialty?

The primary specialty registered for this NPI is Registered Nurse, specializing in Oncology, with taxonomy code 163WX0200X.

Is Barbara O'callaghan enrolled in Medicare?

Yes. Barbara O'callaghan 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 Barbara O'callaghan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Barbara O'callaghan reassigns Medicare benefits to 3 organizations: Suburban Hematology Oncology Associates, PC (Lawrenceville, GA), North Atlanta Oncology Services LLC (Lawrenceville, GA) and Northside Hospital, Inc. (Lawrenceville, 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 Barbara O'callaghan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Barbara O'callaghan affiliated with any hospitals?

According to CMS data, Barbara O'callaghan is affiliated with Northside Hospital and Northside Hospital Duluth.

When was this NPI record last updated?

The NPPES record for Barbara O'callaghan was last updated on February 3, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.