John Caleb Grenn, MD

Internal medicine physician in Corpus Christi, Texas · NPI 1225569635

John Grenn is one of 92 internal medicine physicians practicing in Corpus Christi, Texas. John Grenn practices with HHA Hospital Medicine Of Texas PLLC.

Registry record (NPPES)

NPI
1225569635
Type
Type 1 · Individual
Primary taxonomy
Internal Medicine · 207R00000X
Address on file
3315 S Alameda St
Corpus Christi, TX 78411-1820
(877) 832-2652
Enumerated
Mar 27, 2017
Record last updated
Oct 7, 2026
License states listed
TX

Medicare (CMS)

Enrollment
Medicare-enrolled in MS, TX
Internal Medicine, Pediatric Medicine
Revalidation due
No date set by CMS

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Practice locations

More internal medicine physicians in Corpus Christi

Updated August 2026. Practice locations and specialty come from the CMS Doctors and Clinicians file, the registry record from NPPES, and enrollment from CMS Medicare enrollment files. NPI records are corrected at the source, through NPPES.