Dr. John Caleb Grenn , MD
Internal Medicine • Corpus Christi, TX
Professional Overview & Biography Verified Profile Summary
Dr. John Caleb Grenn, MD is a certified Internal Medicine practicing in Corpus Christi, TX. With approximately 9 years of clinical experience since graduating from University Of Mississippi School Of Medicine in 2017, Dr. Grenn delivers high-quality medical care to the local community at 3315 S ALAMEDA ST.
Dr. Grenn maintains professional affiliations with Hha Hospital Medicine Of Texas Pllc, State Of Mississippi-University Of Mississippi Medical Center and accepts Medicare assignment.
Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, hospital discharge day management, initial hospital care with moderate level of medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.
Practice Location & Contact Primary Location
3315 S Alameda St
Corpus Christi, TX 784111820
Medicare Profile & Education
University Of Mississippi School Of Medicine
2017
✓ Accepts Assignment
In-Person Only
Specialty Benchmarks & Practice Insights
Comparative analytics for Internal Medicine in Corpus Christi, TX
Practicing in Corpus Christi, TX (9538 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Clinical Seniority & Experience Comparison
Performed Procedures & Service Volume
Top Medicare Part B procedures performed by this practitioner
| HCPCS Code & Description | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
|
99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
|
265 | 81 | $291.00 | $107.85 |
|
99232
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes
|
123 | 66 | $193.00 | $71.87 |
|
99238
Hospital discharge day management, 30 minutes or less
|
48 | 47 | $198.00 | $72.65 |
|
99223
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes
|
48 | 47 | $424.00 | $159.24 |
Medical Specialties & State Licenses
CMS Verified: 2025-09-09NUCC Taxonomy Code: 207R00000X
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 medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
NUCC Taxonomy Code: 208M00000X
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
Hospital & Practice Group Affiliations
State Of Mississippi-University Of Mississippi Medical Center
2500 N State St, Jackson, MS 392164500
Phone: 6018154775
Hha Hospital Medicine Of Texas Pllc
3315 S Alameda St, Corpus Christi, TX 784111820
Phone: 8778322652
Secondary Practice Locations
7101 S Padre Island Dr
Corpus Christi, TX 784124913
Phone: 8778322652
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Hospitalist
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Doctor of Medicine (M.D.)
Internal Medicine
Internal Medicine - Sleep Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
Registered at 3315 S ALAMEDA ST, CORPUS CHRISTI, TX 784111820 (Tel: 8778322652)
Registered at 1521 S STAPLES ST STE 606, CORPUS CHRISTI, TX 784043166 (Tel: 8778322652)
Internal Medicine (License #V9000 in TX)
NPI status registered as active in NPPES database
Registered at 2500 N STATE ST, JACKSON, MS 392164500 (Tel: 6019845200)
Registered at 123 KELTINGHAM CT, RIDGELAND, MS 391571212 (Tel: 6015201555)
Recorded as JOHN CALEB GRENN, M.D.
Student in an Organized Health Care Education/Training Program
First registered as active Individual Practitioner in NPPES Database.
Patient & Community Reviews
Verified patient ratings, medical care experiences, and facility photos
Sign in to leave a review for Dr. John Caleb Grenn
Only verified registered users can submit ratings, post feedback, and upload facility photos.
NPI Administrative Meta
Mailing Address
1521 S Staples St Ste 606
Corpus Christi, TX 784043166
Phone: 8778322652
This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.