Individual provider Active NPI

Mark A. Mills, MD

  • Internal Medicine Physician
  • Lansing, MI
National Provider Identifier
1104807452
Registry record updated Jul 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
4301049237 Issued in MI
Practice address
6465 Millennium
Suite 100
Lansing, MI 48917-7831
Phone
(517) 367-5220
Fax
(517) 367-5245
NPI assigned
Nov 11, 2005
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 13, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 4301049237 MI Primary

Addresses

Primary practice location

6465 Millennium
Suite 100
Lansing, MI 48917-7831

Mailing address

401 S Ballenger Hwy
Flint, MI 48532-3638
Phone (810) 342-1000

Other identifiers 7

IdentifierTypeStateIssuer
204119OtherMIMCLAREN HEALTH PLAN
F05598OtherMIHEALTH NET FEDERAL SERVIC
7720197OtherMIAETNA
0400264OtherMIPHYSICIANS HEALTH PLAN
204119OtherMIHEALTH ADVANTAGE
1103302772OtherMIBLUE CROSS BLUE SHIELD
4130522MedicaidMI

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Not listed in the public Medicare enrollment file

National Provider Directory

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

Practice roles

OrganizationSpecialtyStatusNew patients
Physician Anesthesia Service PC Past Accepting new patients

Organizations & group practices 1

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.

NPI Registry JSON

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

{
    "created_epoch": "1131667200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1104807452",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "401 S BALLENGER HWY",
            "city": "FLINT",
            "state": "MI",
            "postal_code": "485323638",
            "telephone_number": "810-342-1000",
            "fax_number": "810-342-1590"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "6465 MILLENNIUM",
            "address_2": "SUITE 100",
            "city": "LANSING",
            "state": "MI",
            "postal_code": "489177831",
            "telephone_number": "517-367-5220",
            "fax_number": "517-367-5245"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MILLS",
        "first_name": "MARK",
        "middle_name": "A.",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-11-11",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MI",
            "license": "4301049237",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "MCLAREN HEALTH PLAN",
            "identifier": "204119",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HEALTH NET FEDERAL SERVIC",
            "identifier": "F05598",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "7720197",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "PHYSICIANS HEALTH PLAN",
            "identifier": "0400264",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HEALTH ADVANTAGE",
            "identifier": "204119",
            "state": "MI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS BLUE SHIELD",
            "identifier": "1103302772",
            "state": "MI"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "4130522",
            "state": "MI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Lansing, MI

Sources for this page

  • 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.
  • National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.