Mark D Hauptman, M.D.

Primary specialty

Internal Medicine PhysicianTaxonomy code 207R00000X

License

G55356 Issued in CA

Practice address

26991 Crown Valley Pkwy Ste 100
Mission Viejo, CA 92691-6511

Phone

(949) 582-5430

NPI assigned

Dec 23, 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 1

Medicare fee-for-service enrollment

Enrolled in CA

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

Internal Medicine

Education

University of California, Irvine, California College of Medicine, 1984

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Centers for Family Medicine GPGroup PAC ID 9931143799, 87 clinicians

Healthcare Partners Affiliates Medical GroupGroup PAC ID 7315842002, 775 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Providence Mission Hospital Hospital, Mission Viejo, CA, CCN 050567

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mhauptman195175@westdirect.optum.com
• Direct secure messaging: mark.hauptman.p33@direct.monarchhealthcare.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.

• Centers for Family Medicine GP

  dba Optumcare Medical Group

  • Family Medicine Physician
  • Los Alamitos, CA
  • NPI 1467598243

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1659312593
  Medicare reassignment Care Compare group NPD
• Healthcare Partners Affiliates Medical Group

  dba Optum

  • Durable Medical Equipment & Medical Supplies
  • Murrieta, CA
  • NPI 1760057269
  NPD
• Mission Internal Medical Group, Inc.

  • Multi-Specialty Clinic/Center
  • Mission Viejo, CA
  • NPI 1902884174
  NPD
• Memorial Medical Group Inc

  • Durable Medical Equipment & Medical Supplies
  • Phoenix, AZ
  • NPI 1255523643
  NPD (past)

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

• Mission Hospital Regional Medical Center

  dba Providence Mission Hospital

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1912108002
  Care Compare affiliation
• Mission Hospital Regional Medical Center

  dba Mission Hospital

  • General Acute Care Hospital
  • Mission Viejo, CA
  • NPI 1992752315
  Care Compare affiliation

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

{
    "created_epoch": "1135296000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1756944000000",
    "number": "1801873427",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 35380",
            "address_2": "SUITE 120",
            "city": "LAS VEGAS",
            "state": "NV",
            "postal_code": "891335380"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "26991 CROWN VALLEY PKWY STE 100",
            "city": "MISSION VIEJO",
            "state": "CA",
            "postal_code": "926916511",
            "telephone_number": "949-582-5430"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "26800 Crown Valley Pkwy",
            "address_2": "SUITE 305",
            "address_purpose": "LOCATION",
            "city": "Mission Viejo",
            "state": "CA",
            "postal_code": "926916384",
            "country_code": "US",
            "telephone_number": "949-364-6000",
            "fax_number": "949-364-3213",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "HAUPTMAN",
        "first_name": "MARK",
        "middle_name": "D",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-12-23",
        "last_updated": "2025-09-04",
        "certification_date": "2025-09-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CA",
            "license": "G55356",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "00G553560",
            "state": "CA"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Annabelle Delight Hartshorn, ASW
• Shaun Xavier Harvey
• Rasha Adele Hashad, MD
• Nahal Hassani
• Amy Hathaway, R.D.N.
• Stephanie Shea Hawkins, MD
• Morgan Denee Hawrysz
• Ronald Scott Haxton, M.D.
• Kenneth Hiroshi Hayashida Jr., M.D.
• Julie Haynes

• Internal Medicine Physician in Mission Viejo, CA
• Providers in Mission Viejo, CA by specialty
• Internal Medicine Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 4, 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.