Mark Led Grebener, LCSW LAC

Primary specialty

Clinical Social WorkerTaxonomy code 1041C0700X

Practice address

5574 S Prince St
#11
Littleton, CO 80120

Phone

(303) 883-4808

Fax

(303) 794-6736

NPI assigned

Sep 25, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Enrolled

State licenses

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.

• Mark Grebener, LLC

  • Clinical Social Worker
  • Denver, CO
  • NPI 1063697738
  Authorized official Same address or phone

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

{
    "created_epoch": "1159142400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1558462481",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1418 E IRWIN LANE",
            "city": "CENTENNIAL",
            "state": "CO",
            "postal_code": "80122",
            "telephone_number": "303-883-4808",
            "fax_number": "303-794-6736"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5574 S PRINCE ST",
            "address_2": "#11",
            "city": "LITTLETON",
            "state": "CO",
            "postal_code": "80120",
            "telephone_number": "303-883-4808",
            "fax_number": "303-794-6736"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREBENER",
        "first_name": "MARK",
        "middle_name": "LED",
        "name_prefix": "Mr.",
        "credential": "LCSW LAC",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-09-25",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "101YA0400X",
            "taxonomy_group": "",
            "desc": "Counselor, Addiction (Substance Use Disorder)",
            "state": "CO",
            "license": "LAC 127",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "CO",
            "license": "CSW 434",
            "primary": false
        },
        {
            "code": "1041C0700X",
            "taxonomy_group": "",
            "desc": "Social Worker, Clinical",
            "state": "IL",
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Keith David Graves, D.C.
• Kelley Gray, LPC
• Lexie Gray, NTP, CPT, CPPC
• Sarah Katherine Gray, LPC
• Taylor Gray
• Cynthia Green, R.N.
• Lorriel Green
• Craig Steven Greene, DDS
• Erika Greene, NNP
• Kelly E Greene, M.D.

• Clinical Social Worker in Littleton, CO
• Providers in Littleton, CO by specialty
• Clinical Social Worker in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; 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.