Frederick A Klein, M.D.

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

11761 Issued in AZ

Practice address

7566 N la Cholla Blvd
Ste a
Tucson, AZ 85741-2307

Phone

(520) 742-4139

Fax

(520) 742-9618

NPI assigned

Dec 13, 2005

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 5

Medicare fee-for-service enrollment

Enrolled in AZ

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 1

Specialty

Gastroenterology

Education

Northwestern University Feinberg Medical School, 1980

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Arizona Gastroenterology LTDGroup PAC ID 6507842234, 8 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Northwest Medical Center Hospital, Tucson, AZ, CCN 030085
• Tucson Medical Center Hospital, Tucson, AZ, CCN 030006
• Oro Valley Hospital Hospital, Oro Valley, AZ, CCN 030114

Merit-based Incentive Payment System (MIPS)

Final score

22.5 of 100Reported as individual

Quality

0

Improvement activities

0

Cost

75

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: frederick.klein.p2@direct.azgastroenterology.nextgenshare.com
• FHIR API: https://fhir.nextgen.com/nge/prod/fhir-api-r4/fhir/r4/
• Direct secure messaging: frederick.klein.p1@direct.azgastroenterology.nextgenshare.com

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.

• Arizona Gastroenterology LTD

  • Gastroenterology Physician
  • Tucson, AZ
  • NPI 1043297690
  Medicare reassignment Care Compare group NPD Authorized official

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

• Northwest Hospital LLC

  • General Acute Care Hospital
  • Tucson, AZ
  • NPI 1487607784
  Care Compare affiliation
• Oro Valley Hospital LLC

  • General Acute Care Hospital
  • Oro Valley, AZ
  • NPI 1386697688
  Care Compare affiliation
• Tucson Medical Center

  • General Acute Care Hospital
  • Tucson, AZ
  • NPI 1174512792
  Care Compare affiliation

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

{
    "created_epoch": "1134432000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1962487876",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7566 N LA CHOLLA BLVD",
            "address_2": "STE A",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857412307",
            "telephone_number": "520-742-4139",
            "fax_number": "520-742-9618"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "7566 N LA CHOLLA BLVD",
            "address_2": "STE A",
            "city": "TUCSON",
            "state": "AZ",
            "postal_code": "857412307",
            "telephone_number": "520-742-4139",
            "fax_number": "520-742-9618"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "KLEIN",
        "first_name": "FREDERICK",
        "middle_name": "A",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-12-13",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "AZ",
            "license": "11761",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS  BLUE SHIELD",
            "identifier": "AZ0025410",
            "state": "AZ"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MEDI-CAL",
            "identifier": "XPY035840",
            "state": "AZ"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "223587",
            "state": "AZ"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HEALTHNET",
            "identifier": "1Z0219",
            "state": "AZ"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "696649",
            "state": "AZ"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Robert L Kleeb, P.A.
• Jill Christy Kleeman, RPH
• Nicholas Lee Kleespie, L.AC.
• Kimberly A Kleiman, M.AC., L.AC.
• Amy Klein, MD
• James B Klein, MD
• Jeffrey Stephen Klein, NP
• Jill Klein, HIS
• John R Klein, MD
• Katie Klein, MS, LASAC

• Gastroenterology Physician in Tucson, AZ
• Providers in Tucson, AZ by specialty
• Gastroenterology Physician in Arizona

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 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.