REX MCCALLUM MD
NPI 1326122219
Internal Medicine - Rheumatology in Durham, NC

Q: What is Rex Mccallum's NPI number?

The NPI number for Rex Mccallum is 1326122219. It was assigned to this individual provider in the NPPES registry on October 25, 2006.

Q: What is Rex Mccallum's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Q: When was this NPI record last updated?

The NPPES record for Rex Mccallum was last updated on March 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.

Active since October 25, 2006PECOS EnrolledAccepts Medicare Assignment

2351 ERWIN RD, DURHAM, NC 27705(919) 385-3000(919) 576-8820 Get Directions Write a Review

NPPES record last updated: March 4, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Rex Mccallum Md NPPES

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

REX MCCALLUM MD (NPI 1326122219) is an individual rheumatology provider in Durham, North Carolina, licensed in North Carolina (27249) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Duke University Hospital, and is a graduate of Vanderbilt University School Of Medicine (1980).

NPPES Registry Identity

NPI1326122219

Entity TypeIndividualMale

Primary Taxonomy207RR0500X

Provider Legal NameREX MCCALLUMCredential: MD

Location Address2351 ERWIN RDDurham, NC 27705-4699

Mailing Address40 Duke Medical CirDurham, NC 27710-3006 · (919) 385-3000 · Fax (919) 385-8820

Phone(919) 385-3000

Fax(919) 576-8820

Sole ProprietorNo

Medical School CMSVanderbilt University School Of MedicineGraduated 1980

Enumeration DateOctober 25, 2006

Last NPPES UpdateMarch 4, 2026

NPPES CertifiedMarch 4, 2026

✔ NPI 1326122219 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians

Taxonomy Code207RR0500X

License✔ Licensed in NC · 27249

Definition

An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.

2351 ERWIN RD, Durham, NC 27705

Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Absolute Total Care, Ambetter of North Carolina, Ambetter of Tennessee and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Rex Mccallum Md 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 ID5991986598

PECOS Enrollment IDI20210901004004

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.

Areas of Expertise CMS Part B claims 5

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.

351 services206 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

60 services39 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

47 services47 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.

34 services29 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.

23 services20 patients

Hospital Affiliations CMS Care Compare

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

Duke University Hospital

Acute Care Hospitals · Durham, NC

5/5 CMS rating

OwnershipProprietary

CMS Certification Number340030

Location2100 Erwin RdDurham, NC 27705 · Durham County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 27705 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

$125.01 typical visit price

range $54.12 – $165.09

Typical copayment $31.25 (range $13.53 – $41.27)

Most-billed visit code 99204

Established Patient

$95.94 typical visit price

range $17.21 – $134.61

Typical copayment $23.98 (range $4.30 – $33.65)

Most-billed visit code 99214

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.

HENRY HSIEN-CHUN TSENG MD

Ophthalmology