NPIMap

Individual provider Active NPI

Mark I Chieh Hong, M.D

  • Nephrology Physician
  • Mason City, IA
National Provider Identifier
1982048286
Registry record updated Jul 15, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Nephrology PhysicianTaxonomy code 207RN0300X
License
42588 Issued in IA
Practice address
1000 4TH St SW
Mason City, IA 50401-2800
Phone
(641) 428-6999
Fax
(641) 428-6678
NPI assigned
Apr 17, 2013
Last updated
Jul 15, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 15, 2025

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Student in an Organized Health Care Education/Training Program 390200000X NU
Nephrology Physician 207RN0300X 42588 IA Primary

Addresses

Primary practice location

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

Mailing address

621 S Illinois Ave
Suite 103
Mason City, IA 50401-5489
Phone (641) 428-3041

Other names 1

  • I Chieh Hong Former name

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address mhong3947332@direct.trinity-health.org Direct

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
I20150707000676 IA Practitioner - NephrologyPractitioner - Internal Medicine 7113239096 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
NephrologyAlso: Internal Medicine
Education
Other, 2010
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
North Iowa Mercy ClinicsGroup PAC ID 7810809076, 304 clinicians
Hancock County Health SystemGroup PAC ID 9739080425, 14 clinicians

Practice addresses (Care Compare)

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

532 1St St NW
Britt Medical Clinic
Britt, IA 50423-1227
Phone (641) 843-5050

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

Merit-based Incentive Payment System (MIPS)

Final score
93.78 of 100Reported as apm
Quality
80.38
Promoting interoperability
100
Improvement activities
40

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
42588IAMDNephrology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Hancock County Health System CurrentSince Jul 1, 2017 Accepting new patients
Hancock County Health System CurrentSince Jul 1, 2017 Accepting new patients
North Iowa Mercy Clinics Current Accepting new patients
Sound Physicians of Iowa, PLLC CurrentSince Jun 1, 2015 Accepting new patients
North Iowa Mercy Clinics CurrentSince Oct 24, 2016 Accepting new patients
North Iowa Mercy Clinics CurrentSince Oct 24, 2016 Accepting new patients
Cogent Healthcare of Iowa, PC CurrentSince Nov 1, 2015 Accepting new patients
Floyd County Memorial Hospital Commission Past Accepting new patients
Hancock County Health System Past Accepting new patients

Locations

532 1st St NW
Britt, IA 50423
Phone (641) 843-4403

3 S 4th Ave
Marshalltown, IA 50158
Phone (641) 754-5145

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

621 S Illinois Ave
Ste 103
Mason City, IA 50401

910 N Eisenhower Ave
Mason City, IA 50401
Phone (641) 422-5437

Interoperability endpoints

  • FHIR API: https://fhir-myrecord.cerner.com/r4/0187d1c0-26b8-42cb-81e4-84d2429978e8/
  • Direct secure messaging: mhong3947332@direct.trinity-health.org

Organizations & group practices 9

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 8

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": "1366156800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1752537600000",
    "number": "1982048286",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "621 S ILLINOIS AVE",
            "address_2": "SUITE 103",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504015489",
            "telephone_number": "641-428-3041",
            "fax_number": "641-428-3059"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 4TH ST SW",
            "city": "MASON CITY",
            "state": "IA",
            "postal_code": "504012800",
            "telephone_number": "641-428-6999",
            "fax_number": "641-428-6678"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HONG",
        "first_name": "MARK",
        "middle_name": "I CHIEH",
        "name_prefix": "Mr.",
        "credential": "M.D",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2013-04-17",
        "last_updated": "2025-07-15",
        "certification_date": "2025-07-15",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": "NU",
            "license": null,
            "primary": false
        },
        {
            "code": "207RN0300X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Nephrology",
            "state": "IA",
            "license": "42588",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "mhong3947332@direct.trinity-health.org",
            "affiliation": "N",
            "endpointDescription": "MercyOne North Iowa Direct Email",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "CCDA",
            "address_1": "1000 4th St SW",
            "city": "Mason City",
            "state": "IA",
            "country_code": "US",
            "postal_code": "504012800",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "I CHIEH",
            "last_name": "HONG",
            "credential": "M.D",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

Other providers in Mason City, IA

Sources for this page

Verify at the official NPI Registry.