Henry Markley Gass IV, M.D.

Primary specialty

Orthopaedic Surgery PhysicianTaxonomy code 207X00000X

License

A201942 Issued in CA

Practice address

14642 Newport Ave Ste 105
Tustin, CA 92780-6058

Phone

(949) 688-0958

Fax

(949) 688-0960

NPI assigned

Apr 21, 2015

Last updated

Aug 6, 2026By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in GA

Enrollment records 1

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: henry.gassmd.p1@direct.osiortho.nextgenshare.com

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.

• Richard Lin DO Inc

  • Orthopaedic Surgery of the Spine Physician
  • Tustin, CA
  • NPI 1174122436

  Single Specialty

  NPD

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

{
    "created_epoch": "1429574400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1785974400000",
    "number": "1346637949",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "14642 NEWPORT AVE STE 105",
            "city": "TUSTIN",
            "state": "CA",
            "postal_code": "927806058",
            "telephone_number": "949-688-0958",
            "fax_number": "949-688-0960"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "14642 NEWPORT AVE STE 105",
            "city": "TUSTIN",
            "state": "CA",
            "postal_code": "927806058",
            "telephone_number": "949-688-0958",
            "fax_number": "949-688-0960"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GASS",
        "first_name": "HENRY",
        "middle_name": "MARKLEY",
        "name_prefix": "Dr.",
        "name_suffix": "IV",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2015-04-21",
        "last_updated": "2026-08-06",
        "certification_date": "2026-08-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207X00000X",
            "taxonomy_group": "",
            "desc": "Orthopaedic Surgery",
            "state": "CA",
            "license": "A201942",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Garfield Beach CVS LLC (CVS Pharmacy # 10806)
• Loren Ashley Garin
• Sherissa Garr, MA, AMFT
• Garvin Group (Passport Health)
• Edgar Omar Garza, PA-C
• Madeline Geerken, AMFT #162890
• Gencare Pharmacy Inc (GenCare Pharmacy)
• Paul Genser, M.D.
• Susan Gent
• Cynthia Martinez Genter, R.D.H.

• Orthopaedic Surgery Physician in Tustin, CA
• Providers in Tustin, CA by specialty
• Orthopaedic Surgery Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 6, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.