NPIMap

Individual provider Active NPI

Tonya L Gray, MD

  • Family Medicine Physician
  • Mason City, IA
National Provider Identifier
1427164201
Registry record updated Aug 26, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Family Medicine PhysicianTaxonomy code 207Q00000X
License
MD-35644 Issued in IA
Practice address
520 S Pierce Ave
Mason City, IA 50401-2749
Phone
(844) 474-4321
Fax
(641) 428-9219
NPI assigned
Aug 22, 2006
Last updated
Aug 26, 2026By the provider in NPPES
Sex
Female
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Aug 26, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Family Medicine Physician 207Q00000X MD-35644 IA Primary

Addresses

Primary practice location

520 S Pierce Ave
Mason City, IA 50401-2749

Mailing address

520 S Pierce Ave Ste 107
Mason City, IA 50401-2749
Phone (844) 474-4321

Other identifiers 2

IdentifierTypeStateIssuer
0447698MedicaidIA
37238OtherIAWELLMARK

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in IA
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20040920001265 IA Practitioner - Family Practice 9739157587 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Family Practice
Education
University of Iowa, RJ & L Carver College of Medicine, 1998
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
North Iowa Mercy ClinicsGroup PAC ID 7810809076, 304 clinicians

Practice addresses (Care Compare)

1000 4TH St SW
Mason City, IA 50401-2800

1010 4TH St SW
Mason City, IA 50401-2856

Hospital & facility affiliations

Merit-based Incentive Payment System (MIPS)

Final score
81.55 of 100Reported as group
Quality
73.89
Promoting interoperability
93
Improvement activities
40
Cost
70.44

Procedures performed for Medicare patients

ProcedureNumber of procedures
Removal of skin lesions1-10

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
35644IAMDFamily Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
North Iowa Mercy Clinics Current Accepting new patients
North Iowa Mercy Clinics Family Medicine CurrentSince Apr 2, 2012 Accepting new patients
North Iowa Mercy Clinics CurrentSince Apr 2, 2012 Accepting new patients
Floyd County Memorial Hospital Commission Family Medicine Past Accepting new patients
Mercy Health Services-Iowa Corp Past Accepting new patients
Orion Family Physicians PC Family Medicine Past Accepting new patients
North Iowa Mercy Clinics Past Accepting new patients
Cerro Gordo County Board of Health Past Accepting new patients

Locations

215 13th Ave SW
Clarion, IA 50525
Phone (515) 532-2836

1000 4th St SW
Mason City, IA 50401
Phone (641) 424-6704

1010 4th St SW
Ste 120
Mason City, IA 50401
Phone (515) 422-6020

520 S Pierce Ave
Mason City, IA 50401
Phone (641) 422-6767

520 S Pierce Ave
Ste 107
Mason City, IA 50401

621 S Illinois Ave
Ste 103
Mason City, IA 50401

Interoperability endpoints

  • Direct secure messaging: tgray3945521@direct.trinity-health.org

Organizations & group practices 8

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

Hospital & facility affiliations 2

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

NPI Registry JSON

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

{
    "created_epoch": "1156204800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787702400000",
    "number": "1427164201",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "520 S PIERCE AVE STE 107",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504012749",
            "telephone_number": "844-474-4321"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "520 S PIERCE AVE",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504012749",
            "telephone_number": "844-474-4321",
            "fax_number": "641-428-9219"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GRAY",
        "first_name": "TONYA",
        "middle_name": "L",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-08-22",
        "last_updated": "2026-08-26",
        "certification_date": "2026-08-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "IA",
            "license": "MD-35644",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "0447698",
            "state": "IA"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "WELLMARK",
            "identifier": "37238",
            "state": "IA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Mason City, IA

Sources for this page

Verify at the official NPI Registry.