John Fox Mast, MD

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

036156608 Issued in IL

Practice address

2000 Ogden Ave
Aurora, IL 60504-5893

Phone

(866) 565-8607

Fax

(312) 563-8661

NPI assigned

May 29, 2018

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in IL

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

Family PracticeAlso: Hospitalist

Education

Loyola University of Chicago, Stritch School of Medicine, 2018

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Prime Healthcare Illinois Medical Group LLCGroup PAC ID 5597275685, 278 clinicians

Rush University Medical GroupGroup PAC ID 5496658874, 1,521 clinicians

Rush-Copley Medical Group NFPGroup PAC ID 7618864877, 101 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Copley Memorial Hospital Hospital, Aurora, IL, CCN 140029
• Presence Mercy Medical Center Hospital, Aurora, IL, CCN 140174
• Valley West Community Hospital Hospital, Sandwich, IL, CCN 141340

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

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.

• Prime Healthcare Illinois Medical Group LLC

  • Multi-Specialty Clinic/Center
  • Des Plaines, IL
  • NPI 1023837689

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Rush University Medical Group

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1093819542

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Rush-Copley Medical Group, NFP

  • Family Medicine Physician
  • Aurora, IL
  • NPI 1093075848
  Medicare reassignment Care Compare group NPD
• Kane Physician Services, P.C.

  • Internal Medicine Physician
  • Aurora, IL
  • NPI 1598527483

  Hospitalist

  Medicare reassignment NPD
• Rush Medical Group

  • Internal Medicine Physician
  • Chicago, IL
  • NPI 1467312850
  Medicare reassignment
• Rush University Medical Center

  • Internal Medicine Physician
  • Oak Brook, IL
  • NPI 1801375696
  NPD
• Copley Memorial Hospital Inc.

  • Family Medicine Physician
  • Aurora, IL
  • NPI 1629003165
  NPD (past)
• Rush Copley Medical Group

  • Family Medicine Physician
  • Aurora, IL
  • NPI 1194836247
  NPD (past)

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

• Copley Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Aurora, IL
  • NPI 1295882561
  Care Compare affiliation
• Mercy Medical Center - Aurora LLC

  • General Acute Care Hospital
  • Aurora, IL
  • NPI 1598503922
  Care Compare affiliation
• Valley West Community Hospital

  • Critical Access Hospital
  • Sandwich, IL
  • NPI 1184705931
  Care Compare affiliation

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

{
    "created_epoch": "1527552000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758758400000",
    "number": "1811488646",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2000 OGDEN AVE STE P050",
            "city": "AURORA",
            "state": "IL",
            "postal_code": "605045893",
            "telephone_number": "630-499-2404",
            "fax_number": "630-499-4750"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2000 OGDEN AVE",
            "city": "AURORA",
            "state": "IL",
            "postal_code": "605045893",
            "telephone_number": "866-565-8607",
            "fax_number": "312-563-8661"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "1325 N Highland Ave",
            "address_purpose": "LOCATION",
            "city": "Aurora",
            "state": "IL",
            "postal_code": "605061449",
            "country_code": "US",
            "telephone_number": "630-859-2222",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "MAST",
        "first_name": "JOHN",
        "middle_name": "FOX",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2018-05-29",
        "last_updated": "2025-09-25",
        "certification_date": "2025-09-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208M00000X",
            "taxonomy_group": "",
            "desc": "Hospitalist",
            "state": "IL",
            "license": "036156608",
            "primary": false
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "IL",
            "license": "036156608",
            "primary": true
        },
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "IL",
            "license": "125072449",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Zarina Masih
• Beth Nicole Maslowsky, M.A., CCC-SLP
• Cynthia Massie
• Michelle Massie
• Anthony Massih
• Gary Joseph Masterson, O.D.
• Cynthia Mata, MD
• Evelyn Mata, MSN,APRN, FNP-C
• Tamzyn Mather, MS, OTD, OTR/L
• Benjamin Mathew, MD

• Family Medicine Physician in Aurora, IL
• Providers in Aurora, IL by specialty
• Family Medicine Physician in Illinois

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 25, 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.