Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Barbara O'Callaghan, RN, NP

Individual provider Oncology Registered Nurse · NPI 1003041104

Barbara O'Callaghan, RN, NP is a Nurse Practitioner in Lawrenceville, Georgia. Qualified in 2008, 18 years ago. Practices with North Atlanta Oncology Services LLC, a 30-clinician group and accepts Medicare assignment. Licensed in Georgia.

Years since qualifying
18
Licensed in
GA
In the registry since
2009
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

See every abbreviation used in this directory →

Practice location Address checks out

631 Professional Drive 450
Lawrenceville, GA 30046-7651
Phone: (770) 963-8030
Fax: (770) 339-9577
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Oncology Registered Nurse (primary) Taxonomy 163WX0200X · Licence RN139570 (GA)

Record details

NPI number1003041104
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN , NP
Sole proprietorNo
NPI enumeratedMay 19, 2009
Last updated in NPPESFebruary 3, 2010
Mailing address651 Carroll'S Way, Buford, GA 30518

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2008 (18 years in practice)
Group practice North Atlanta Oncology Services Llc — 30 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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