REX MCCALLUM (MD) – Rheumatology Physician, NPI 1326122219
Rheumatology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
504 RHEUMATOLOGY in TX
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Provider Addresses for REX MCCALLUM (MD)
301, University Boulevard - 6th Street, Galveston, Galveston County, Texas, 77550, United States
GALVESTON, TX 775555302
Phone: (409) 772-2222
Type: Mailing
2351 ERWIN RD
DURHAM, NC 277054699
Phone: (919) 385-3000
Fax: (919) 576-8820
Type: Location
40 DUKE MEDICAL CIR
DURHAM, NC 277103006
Phone: (919) 385-3000
Fax: (919) 385-8820
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $146.
Total Amount is formed as General ($146) + Research ($0) + Ownership ($0) = $146.
Last reported payment date: 2023-03-18 • Largest payer in this snapshot: GENZYME CORPORATION ($122).
Total Amount
$146
General + Research + Ownership
Payments
2
Total payment records
General Amount
$146
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-03-18
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| GENZYME CORPORATION | $122 |
| Amgen Inc. | $23 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2021-09-01
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20210901004004 | I | Rheumatology | NC | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 339 | 201 | $0 |
| 99205 | New patient office or other outpatient visit, 60-74 minutes | 68 | 68 | $0 |
| 36415 | Insertion of needle into vein for collection of blood sample | 25 | 22 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 25 | 21 | $0 |
| 99215 | Established patient office or other outpatient visit, 40-54 minutes | 17 | 15 | $0 |
Insurance plans in this area (ZIP 77555)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| N E U R O L O G Y | AL | |
| Diagnostic Radiology | FL | |
| Certified Registered Nurse Anesthetist (Crna) | NC | |
| Hematology, Pathology | NC | |
| Infectious Disease | NC | |
| O B S T E T R I C S/ G Y N E C O L O G Y | NC | |
| Physician Assistant | TX | |
| Rheumatology, Internal Medicine | NC | |
| Pediatric Medicine | NC | |
| O P H T H A L M O L O G Y | NC |
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