Rex Mccallum, MD - Medicare Rheumatology in Galveston, TX

Rex Mccallum, MD is a medicare enrolled "Internal Medicine - Rheumatology" physician in Galveston, Texas. He went to Vanderbilt University School Of Medicine and graduated in 1980 and has 44 years of diverse experience with area of expertise as Rheumatology. He is a member of the group practice Duke Health Integrated Practice Inc and his current practice location is 301 University Blvd, Galveston, Texas. You can reach out to his office (for appointments etc.) via phone at (409) 772-2222.

Rex Mccallum is licensed to practice in Texas (license number 43310) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1326122219.

Contact Information

Rex Mccallum, MD
301 University Blvd,
Galveston, TX 77555-5302
(409) 772-2222
Not Available

Map and Direction




Physician's Profile

Full NameRex Mccallum
GenderMale
SpecialityRheumatology
Experience44 Years
Location301 University Blvd, Galveston, Texas
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Rex Mccallum attended and graduated from Vanderbilt University School Of Medicine in 1980
  NPI Data:
  • NPI Number: 1326122219
  • Provider Enumeration Date: 10/25/2006
  • Last Update Date: 11/12/2010
  Medicare PECOS Information:
  • PECOS PAC ID: 5991986598
  • Enrollment ID: I20210901004004

Medical Identifiers

Medical identifiers for Rex Mccallum such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1326122219NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RR0500XInternal Medicine - Rheumatology 27249 (North Carolina)Secondary
207RR0500XInternal Medicine - Rheumatology 43310 (Texas)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Duke University HospitalDurham, NCHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Duke Health Integrated Practice Inc83254127372551

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Rex Mccallum allows following entities to bill medicare on his behalf.
Entity NamePrivate Diagnostic Clinic Pllc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1457389033
PECOS PAC ID: 1355254368
Enrollment ID: O20031204000577
Entity NameDuke Health Integrated Practice Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1205553369
PECOS PAC ID: 8325412737
Enrollment ID: O20230327002247

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Rex Mccallum is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Rex Mccallum, MD
301 University Blvd,
Galveston, TX 77555-5302

Ph: (409) 772-2222
Rex Mccallum, MD
301 University Blvd,
Galveston, TX 77555-5302

Ph: (409) 772-2222

Reviews and Comments


Internal Medicine Doctors in Galveston, TX

Dr. James Harold Pavela, MD
Rheumatology
Medicare: Medicare Enrolled
Practice Location: 301 University Blvd, Galveston, TX 77555
Phone: 409-772-7063    Fax: 409-747-8579
Diaa Hamouda, MBBCH
Rheumatology
Medicare: Accepting Medicare Assignments
Practice Location: 301 University Blvd, Jsa 9.128, Galveston, TX 77555
Phone: 409-772-8031    Fax: 409-772-6940
Syed Mustajab Hasan, MD
Rheumatology
Medicare: Not Enrolled in Medicare
Practice Location: 1005 Harborside Drive, Galveston, TX 77555
Phone: 409-762-2328    Fax: 832-632-7866
Arielle Degueure, MD
Rheumatology
Medicare: Medicare Enrolled
Practice Location: 301 University Blvd, Galveston, TX 77555
Phone: 409-747-1883    Fax: 409-747-8579
Dr. Shawn Pua Eiko Nishi, M.D.
Rheumatology
Medicare: Accepting Medicare Assignments
Practice Location: 301 University Blvd, Galveston, TX 77555
Phone: 409-643-4587    
Suyuan Tan,
Rheumatology
Medicare: Medicare Enrolled
Practice Location: 301 University Blvd, Galveston, TX 77555
Phone: 409-747-1883    
Shahzad Jokhio, MD
Rheumatology
Medicare: Accepting Medicare Assignments
Practice Location: 301 University Blvd, Galveston, TX 77555
Phone: 409-722-2222    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

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