Rex Mccallum, MD
NPI 1326122219 · Rheumatology Physician · Durham, NC
Enrolled with Medicare as Practitioner - Rheumatology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Rex Mccallum, MD is a Rheumatology Physician provider in Durham, NC (NPI 1326122219).
Provider details
- NPI number
- 1326122219
- Entity type
- Individual
- Primary specialty
- Rheumatology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 27249 (NC)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
841 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 351 | $117 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 326 | $15 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 60 | $9 |
| New Patient Office Or Other Outpatient Visit With a High Level of Medical Decision Making, If Using Time, 60 Minutes Or More99205 | 47 | $204 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 34 | $85 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 31 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Methotrexate Sodiumbrand: Methotrexate | 446 | 115 |
| Adalimumabbrand: Humira(cf) Pen | 305 | 36 |
| Prednisone | 247 | 75 |
| Hydroxychloroquine Sulfate | 122 | 42 |
| Mycophenolate Mofetil | 98 | 34 |
| Allopurinol | 78 | 17 |
| Leflunomide | 66 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-10-25
- Last updated
- 2026-03-04
- Certified
- 2026-03-04
Frequently asked questions
- What is Rex Mccallum's NPI number?
- Rex Mccallum's National Provider Identifier (NPI) is 1326122219, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Rex Mccallum's specialty?
- Rex Mccallum is listed in the NPPES registry with a primary specialty of Rheumatology Physician (Allopathic & Osteopathic Physicians).
- Where is Rex Mccallum located?
- Rex Mccallum's practice location on file with NPPES is 2351 Erwin Rd, Durham, NC 27705-4699.
- What is Rex Mccallum's phone number?
- The practice phone number listed in the NPPES registry for Rex Mccallum is (919) 385-3000.
- Does Rex Mccallum accept Medicare?
- Rex Mccallum is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Rex Mccallum's NPI active?
- Yes — Rex Mccallum's NPI (1326122219) is active in the NPPES registry as of the last update on 2026-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.