NPIMap

Individual provider Active NPI

William Earle Bonis, MD

  • Hematology & Oncology Physician
  • Chico, CA
National Provider Identifier
1689779209
Registry record updated Oct 2, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Hematology & Oncology PhysicianTaxonomy code 207RH0003X
License
A53478 Issued in CA
Practice address
265 Cohasset Rd
Chico, CA 95926-2273
Phone
(530) 332-3890
Fax
(530) 893-6907
NPI assigned
Sep 14, 2006
Last updated
Oct 2, 2026By the provider in NPPES
Sex
Male
Sole proprietor
Yes

NPPES NPI Registry

Updated by the provider on Oct 2, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Hematology & Oncology Physician 207RH0003X MD61518247 WA
Hematology & Oncology Physician 207RH0003X A53478 CA Primary

Addresses

Primary practice location

265 Cohasset Rd
Chico, CA 95926-2273

Mailing address

PO Box 7555
Chico, CA 95927-7555
Phone (530) 332-3890

Other practice location 1

2000 Hospital Dr
Sedro Woolley, WA 98284-4327
Phone (360) 856-7588

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CA, WA2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20060510000546 CA Practitioner - Hematology/OncologyPractitioner - Internal Medicine 4587675178 Reassigns benefits to 3 organizations
I20240327000901 WA Practitioner - Hematology/Oncology 4587675178 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Hematology/OncologyAlso: Internal Medicine
Education
Other, 1990
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Telehealth
Offers telehealth services
Group practices
Marshall Medical CenterGroup PAC ID 7517875859, 168 clinicians

Practice addresses (Care Compare)

3581 Palmer Dr
Suite 400
Cameron Park, CA 95682-8237
Phone (530) 676-6600

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
53478CAMDDentist
A53478CAMDHematology & Oncology Physician
MD61518247WAMDHematology & Oncology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Intermountain Medical Group Denver, LLC Hematology & Oncology Current Accepting new patients
Intermountain Medical Group Denver, LLC CurrentSince Apr 22, 2023 Accepting new patients
Marshall Medical Center CurrentSince Aug 1, 2025 Accepting new patients
Marshall Medical Center CurrentSince Aug 1, 2025 Accepting new patients
Enloe Specialty Physicians, Inc CurrentSince Oct 16, 2017 Accepting new patients
Dignity Health Current Accepting new patients
Intermountain Medical Group Denver, LLC CurrentSince Apr 22, 2023 Accepting new patients
Dignity Health CurrentSince Sep 11, 2023 Accepting new patients
Dignity Health CurrentSince Sep 11, 2023 Accepting new patients
Chico Hematology Oncology Hematology & Oncology Past Accepting new patients

Locations

3501 Palmer Dr
Ste 201
Cameron Park, CA 95682
Phone (530) 626-2611

3581 Palmer Dr
Ste 400
Cameron Park, CA 95682
Phone (415) 297-8303

265 Cohasset Rd
Chico, CA 95926
Phone (530) 332-3808

265 Cohasset Rd
Ste 150
Chico, CA 95926
Phone (530) 899-8000

1004 Fowler Way
Ste 4
Placerville, CA 95667
Phone (530) 626-9488

2175 Rosaline Ave
Redding, CA 96001
Phone (530) 225-7247

310 Hartnell Ave
Ste Ac
Redding, CA 96002
Phone (530) 225-6390

500 Eldorado Blvd
Ste 4300
Broomfield, CO 80021

Interoperability endpoints

  • Direct secure messaging: wbonis15173@enloedirect.org
  • Direct secure messaging: wbonis3451753@wm.providencedirect.org

Organizations & group practices 11

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.

Hospital & facility affiliations 7

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

NPI Registry JSON

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

{
    "created_epoch": "1158192000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790899200000",
    "number": "1689779209",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 7555",
            "city": "CHICO",
            "state": "CA",
            "postal_code": "959277555",
            "telephone_number": "530-332-3890",
            "fax_number": "530-893-6907"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "265 COHASSET RD",
            "city": "CHICO",
            "state": "CA",
            "postal_code": "959262273",
            "telephone_number": "530-332-3890",
            "fax_number": "530-893-6907"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2000 Hospital Dr",
            "address_purpose": "LOCATION",
            "city": "Sedro Woolley",
            "state": "WA",
            "postal_code": "982844327",
            "country_code": "US",
            "telephone_number": "360-856-7588",
            "fax_number": "360-856-7252",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BONIS",
        "first_name": "WILLIAM",
        "middle_name": "EARLE",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2006-09-14",
        "last_updated": "2026-10-02",
        "certification_date": "2026-10-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "WA",
            "license": "MD61518247",
            "primary": false
        },
        {
            "code": "207RH0003X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology & Oncology",
            "state": "CA",
            "license": "A53478",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Chico, CA

Sources for this page

Verify at the official NPI Registry.