William Ernesto Irizarry Jr., PHARM.D.

Primary specialty

Pharmacist Clinician (PhC)/ Clinical Pharmacy SpecialistTaxonomy code 1835P0018X

License

20869 Issued in CO

Practice address

3801 E 120TH Ave
Thornton, CO 80233-6701

Phone

(303) 451-9470

NPI assigned

Aug 28, 2015

Last updated

Jun 3, 2026By the provider in NPPES

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

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Pharmacy

State licenses

Practice roles

Locations

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.

• Dillon Companies LLC

  dba King Soopers Pharmacy

  • Community/Retail Pharmacy
  • Commerce City, CO
  • NPI 1386670859
  NPD
• Dillon Companies LLC

  dba King Soopers Pharmacy #153

  • Community/Retail Pharmacy
  • Fountain, CO
  • NPI 1194524165
  NPD (past)

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

{
    "created_epoch": "1440720000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1780444800000",
    "number": "1982071759",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "12731 GLENCOE ST",
            "city": "THORNTON",
            "state": "CO",
            "postal_code": "802413311",
            "telephone_number": "915-309-0403"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "3801 E 120TH AVE",
            "city": "THORNTON",
            "state": "CO",
            "postal_code": "802336701",
            "telephone_number": "303-451-9470"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "IRIZARRY",
        "first_name": "WILLIAM",
        "middle_name": "ERNESTO",
        "name_prefix": "Dr.",
        "name_suffix": "Jr.",
        "credential": "PHARM.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-08-28",
        "last_updated": "2026-06-03",
        "certification_date": "2026-06-03",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1835P0018X",
            "taxonomy_group": "",
            "desc": "Pharmacist, Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist",
            "state": "CO",
            "license": "20869",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Intermountain Medical Group Denver, LLC (Thornton Clinic)
• Intermountain Medical Group Denver, LLC (Community Foot & Ankle Clinic - DME)
• Intermountain Medical Group Denver, LLC (Larkridge Clinic)
• Intrepid Bodyworks, LLC
• Charlotte Iobe
• Christopher L Isaacs, DO
• J Medical Inc (Therahand Physical Therapy)
• James J Jackman, CAC II
• James Jackson
• Tandy Jackson, LPC-MHSP

• Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Thornton, CO
• Providers in Thornton, CO by specialty
• Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Colorado

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jun 3, 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.