Individual provider · Type 1 NPI

John Caleb Grenn, MD

Internal Medicine Physician · Corpus Christi, TX

NPI number 1225569635 Active

Practice location

3315 S Alameda St
Corpus Christi, TX 78411-1820

Call (877) 832-2652 Map

Fax (877) 454-6896

Mailing address

1521 S Staples St Ste 606
Corpus Christi, TX 78404-3166

Other practice locations

  • 301 University Blvd, Galveston, TX 77555-5302 · (409) 747-1883
  • 7101 S Padre Island Dr, Corpus Christi, TX 78412-4913 · (877) 832-2652

Specialties and licenses

TaxonomyCodeLicense
Internal Medicine Physician Primary 207R00000XV9000 (TX)
Hospitalist Physician 208M00000XV9000 (TX)

Internal Medicine Physician: A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medi…

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About NPI 1225569635

John Caleb Grenn, MD's National Provider Identifier is 1225569635, issued on Mar 27, 2017. The primary taxonomy on file is Internal Medicine Physician (207R00000X), and the practice location is in Corpus Christi, TX. The record was last updated on Oct 7, 2026.