Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

John Caleb Grenn, MD

Individual provider Internal Medicine Physician · NPI 1225569635

John Caleb Grenn, MD is an Internal Medicine in Corpus Christi, Texas. Graduated from University of Mississippi School of Medicine in 2017, 9 years ago. Practices with Hha Hospital Medicine of Texas PLLC, a 27-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Texas.

Years since qualifying
9
Trained at
University of Mississippi School of Medicine
Licensed in
TX
In the registry since
2017
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

3315 S Alameda St
Corpus Christi, TX 78411-1820
Phone: (877) 832-2652
Fax: (877) 454-6896
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 7101 S Padre Island Dr, Corpus Christi, TX 78412-4913 — (877) 832-2652

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence V9000 (TX)
Hospitalist Physician Taxonomy 208M00000X · Licence V9000 (TX)

Record details

NPI number1225569635
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 27, 2017
Last updated in NPPESSeptember 9, 2025
Certification dateSeptember 9, 2025
Mailing address1521 S Staples St Ste 606, Corpus Christi, TX 78404-3166

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MISSISSIPPI SCHOOL OF MEDICINE
Graduated 2017 (9 years in practice)
Group practice Hha Hospital Medicine Of Texas Pllc — 27 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Corpus Christi