What is Rex Mccallum's specialty?

Rex Mccallum (NPI 1326122219) is a Medicare-billing provider whose primary specialty is Rheumatology in Galveston, TX.

Where does Rex Mccallum practice?

Rex Mccallum practices in Galveston, TX, based on the location reported in the CMS Medicare provider datasets for NPI 1326122219.

How much does Medicare pay Rex Mccallum?

Rex Mccallum (NPI 1326122219) received approximately $47K in total Medicare Part B payments, serving 265 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1326122219

Rex MccallumMD

PRACTICEUTMBSee all providers at this practice →

RheumatologyGalveston, TXI

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

550

Unique beneficiaries

—

Total services

841

Distinct HCPCS

Medicare payment

$45K

Peer benchmark

Total Medicare services vs. 382 Rheumatology providers in TX — below median (cohort median 13,742).

PRESCRIBING · PART D · 2024

Total Rx claims

1,876

Beneficiaries

—

Total drug cost

$3.9M

Distinct drugs

Brand share

51.7%

Top prescribed drugs

Methotrexate Sodium446 claims

Adalimumab305 claims

Prednisone247 claims

Hydroxychloroquine Sulfate122 claims

Mycophenolate Mofetil98 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

No data available for this provider in 2025.

FACILITY AFFILIATIONS

Hospital & Facility Affiliations (1)

CCN 340030

Hospital

REFERRAL NETWORK

Where Rex Mccallum's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 0 inbound referrers · 1 outbound destinations.

Receives referrals from

Inbound — who sends patients here

No inbound pairs above the suppression threshold.

Refers patients to

Outbound — where patients go next

Physician	Patients	Visits
UNIVERSITY OF TEXAS MEDICAL BRANCH AT GALVESTON	39	318

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events