JOHN CALEB GRENN M.D.
NPI 1225569635
Internal Medicine in Corpus Christi, TX
About John Caleb Grenn M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN CALEB GRENN M.D. (NPI 1225569635) is an individual internal medicine provider in Corpus Christi, Texas, licensed in Texas (V9000) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS, is affiliated with University Of Mississippi Med Center, and maintains a secondary practice location in Corpus Christi.
NPPES Registry Identity
Specialties & Licenses 2
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.
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
John Caleb Grenn M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
University Of Mississippi Med Center
Acute Care Hospitals · Jackson, MSCorpus Christi Medical Center,the
Acute Care Hospitals · Corpus Christi, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 78411 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
CORPUS CHRISTI, TX 78411
CORPUS CHRISTI, TX 78411
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Caleb Grenn's NPI number?
The NPI number for John Caleb Grenn is 1225569635. It was assigned to this individual provider in the NPPES registry on March 27, 2017.
Where is John Caleb Grenn located?
John Caleb Grenn practices at 3315 S Alameda St, Corpus Christi, TX 78411. The listed phone number is (877) 832-2652.
What is John Caleb Grenn's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is John Caleb Grenn enrolled in Medicare?
Yes. John Caleb Grenn is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
What insurance does John Caleb Grenn accept?
Health plans from Ambetter from Arkansas Health & Wellness, Ambetter from Louisiana Healthcare Connections, Ambetter from Magnolia Health, Ambetter of Alabama and Ambetter of Tennessee and 1 other insurer list John Caleb Grenn as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Caleb Grenn affiliated with any hospitals?
According to CMS data, John Caleb Grenn is affiliated with University Of Mississippi Med Center and Corpus Christi Medical Center,the.
When was this NPI record last updated?
The NPPES record for John Caleb Grenn was last updated on September 9, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.
