Amy B Jentz, M.D.

Primary specialty

Surgery PhysicianTaxonomy code 208600000X

License

4301076427 Issued in MI

Practice address

550 E Washington St
Ionia, MI 48846-2202

Phone

(616) 523-1630

Fax

(616) 523-1631

NPI assigned

Aug 20, 2006

Sex

Female

Sole proprietor

No

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.

• Sparrow Carson Hospital

  • Internal Medicine Physician
  • Carson City, MI
  • NPI 1598490542

  MI

  Medicare reassignment Care Compare group NPD
• Sparrow Ionia Hospital

  • Critical Access Hospital
  • Ionia, MI
  • NPI 1700820065

  MI

  Medicare reassignment Care Compare group NPD
• Sparrow Clinton Hospital

  • Critical Access Hospital
  • Saint Johns, MI
  • NPI 1093809824

  MI

  Medicare reassignment NPD
• Sparrow Clinton Hospital

  • Multi-Specialty Clinic/Center
  • Saint Johns, MI
  • NPI 1306893078

  MI

  Medicare reassignment NPD
• Sparrow Clinton Hospital

  • Emergency Medicine Physician
  • Saint Johns, MI
  • NPI 1396827952

  MI

  Medicare reassignment NPD
• Sparrow Carson Hospital

  • Rural Health Clinic/Center
  • Carson City, MI
  • NPI 1013987833
  Care Compare group NPD (past)
• Sparrow Carson Hospital

  • General Acute Care Hospital
  • Carson City, MI
  • NPI 1336103043
  Care Compare group
• Sparrow Carson Hospital

  • Anesthesiology Physician
  • Carson City, MI
  • NPI 1396789798
  Care Compare group
• Sparrow Carson Hospital

  • Rural Health Clinic/Center
  • Greenville, MI
  • NPI 1689644403
  Care Compare group
• Sparrow Carson Hospital

  • Rural Health Clinic/Center
  • Carson City, MI
  • NPI 1699200550
  Care Compare group
• Sparrow Carson Hospital

  • Rural Health Clinic/Center
  • Ithaca, MI
  • NPI 1770553547
  Care Compare group
• Sparrow Carson Hospital

  • Rural Health Clinic/Center
  • Stanton, MI
  • NPI 1821068479
  Care Compare group

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

• Sparrow Carson Hospital

  • General Acute Care Hospital
  • Carson City, MI
  • NPI 1336103043

  Hospital

  Care Compare affiliation
• Sparrow Ionia Hospital

  • Critical Access Hospital
  • Ionia, MI
  • NPI 1700820065

  Hospital

  Care Compare affiliation

Specialty

General Surgery

Education

Medical College of Wisconsin, 2000

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Sparrow Ionia Hospital 42 clinicians

Sparrow Carson Hospital 63 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Sparrow Ionia Hospital Hospital, Ionia, MI, CCN 231331
• University of Michigan Health-Sparrow Carson Hospital, Carson City, MI, CCN 230208

Procedures performed for Medicare patients

Medicare fee-for-service enrollment

Enrolled in MI

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.

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: ajentz4137@sparrowdirecthie.org

The complete NPPES record for this NPI in the NPI Registry API format, last updated by the provider on Aug 12, 2026.

{
    "created_epoch": "1156032000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786492800000",
    "number": "1831204601",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "550 E WASHINGTON ST",
            "city": "IONIA",
            "state": "MI",
            "postal_code": "488462202",
            "telephone_number": "616-522-0714",
            "fax_number": "616-522-0456"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "550 E WASHINGTON ST",
            "city": "IONIA",
            "state": "MI",
            "postal_code": "488462202",
            "telephone_number": "616-523-1630",
            "fax_number": "616-523-1631"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "JENTZ",
        "first_name": "AMY",
        "middle_name": "B",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-08-20",
        "last_updated": "2026-08-12",
        "certification_date": "2026-08-12",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "MI",
            "license": "4301076427",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MCLAREN",
            "identifier": "1016881",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "TRICARE",
            "identifier": "383218134",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MOLINA",
            "identifier": "4791262",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "PRIORITY HEALTH PAY TO #",
            "identifier": "03004",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BCBS OF MI GROUP",
            "identifier": "700C460060",
            "state": "MI"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "104791262",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "PHPMM",
            "identifier": "200000002169",
            "state": "MI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Claire Jackson
• Amanda Jandernoa, PT, DPT
• JC Home Care
• Erin Jeltema, M.A, C.A.D.C
• Jennifer Jenks
• Aimee Lee Johnson, FNP-C
• Anna Corinne Johnson, D.C.
• Courtney Johnson
• Crist E Johnson, D.D.S.
• Heather Lynn Johnson, RPH

• All providers in Ionia, MI
• Surgery Physician in Michigan

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 12, 2026; 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.