John Caleb Grenn, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

V9000 Issued in TX

Practice address

3315 S Alameda St
Corpus Christi, TX 78411-1820

Phone

(877) 832-2652

Fax

(877) 454-6896

NPI assigned

Mar 27, 2017

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in MS, TX2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 2

Specialty

Internal Medicine

Education

University of Mississippi School of Medicine, 2017

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

HHA Hospital Medicine of Texas PLLCGroup PAC ID 7618329079, 27 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Corpus Christi Medical Center,the Hospital, Corpus Christi, TX, CCN 450788

Merit-based Incentive Payment System (MIPS)

Final score

83.94 of 100Reported as group

Quality

67.75

Promoting interoperability

100

Improvement activities

40

Cost

71.17

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• HHA Hospital Medicine of Texas PLLC

  • Hospitalist Physician
  • Huntsville, TX
  • NPI 1083489967
  Medicare reassignment Care Compare group NPD
• State of Mississippi - University of Mississippi Medical Center

  • General Acute Care Hospital
  • Jackson, MS
  • NPI 1154317527
  Medicare reassignment NPD
• State of Mississippi - University of Mississippi Medical Center

  • Prosthetic/Orthotic Supplier
  • Jackson, MS
  • NPI 1235019530
  NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Bay Area Healthcare Group, LTD.

  • General Acute Care Hospital
  • Corpus Christi, TX
  • NPI 1508810573
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1490572800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757376000000",
    "number": "1225569635",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1521 S STAPLES ST STE 606",
            "city": "CORPUS CHRISTI",
            "state": "TX",
            "postal_code": "784043166",
            "telephone_number": "877-832-2652",
            "fax_number": "361-371-8376"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3315 S ALAMEDA ST",
            "city": "CORPUS CHRISTI",
            "state": "TX",
            "postal_code": "784111820",
            "telephone_number": "877-832-2652",
            "fax_number": "877-454-6896"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "7101 S Padre Island Dr",
            "address_purpose": "LOCATION",
            "city": "Corpus Christi",
            "state": "TX",
            "postal_code": "784124913",
            "country_code": "US",
            "telephone_number": "877-832-2652",
            "fax_number": "877-454-6896",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "GRENN",
        "first_name": "JOHN CALEB",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2017-03-27",
        "last_updated": "2025-09-09",
        "certification_date": "2025-09-09",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "TX",
            "license": "V9000",
            "primary": true
        },
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "TX",
            "license": "V9000",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jane Ann Green, LPA-I
• Kylie Reagan Greenamyer
• Greentree Health
• Hope Ladawn Greenwade, MSN APRN FNP-C
• Christopher Greenwell, DC
• James Arthur Grieme, M.D.
• Martin Grieme, M.D.
• Kylee Grieser, CCC-SLP
• Glenn A Griffin, DO
• Mykaela Ann Griffin

• Internal Medicine Physician in Corpus Christi, TX
• Providers in Corpus Christi, TX by specialty
• Internal Medicine Physician in Texas

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 9, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.