Margret Callahan
NPI 1144195892 · Acute Care Nurse Practitioner · Greenville, SC
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margret Callahan is a Acute Care Nurse Practitioner provider in Greenville, SC (NPI 1144195892).
Provider details
- NPI number
- 1144195892
- Entity type
- Individual
- Primary specialty
- Acute Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Female
- Sole proprietor
- No
- License
- 30891 (SC)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
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.
Practice location
Mailing address
Additional practice locations (1)
- 701 Grove RdGreenville, SC 29605-4210Phone: (864) 455-7000
Registry dates
- Enumerated
- 2025-10-10
- Last updated
- 2026-01-14
- Certified
- 2026-01-14
Frequently asked questions
- What is Margret Callahan's NPI number?
- Margret Callahan's National Provider Identifier (NPI) is 1144195892, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margret Callahan's specialty?
- Margret Callahan is listed in the NPPES registry with a primary specialty of Acute Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Margret Callahan located?
- Margret Callahan's practice location on file with NPPES is 890 W Faris Rd Ste 580, Greenville, SC 29605-4281.
- What is Margret Callahan's phone number?
- The practice phone number listed in the NPPES registry for Margret Callahan is (864) 455-7874.
- Does Margret Callahan accept Medicare?
- Margret Callahan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margret Callahan's NPI active?
- Yes — Margret Callahan's NPI (1144195892) is active in the NPPES registry as of the last update on 2026-01-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.