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DR. WILLIAM EARLE BONIS MD
NPI 1689779209
Internal Medicine - Hematology & Oncology in Chico, CA

Active since September 14, 2006PECOS EnrolledAccepts Medicare Assignment
265 COHASSET RD, CHICO, CA 95926(530) 332-3890(530) 893-6907 Get Directions Write a Review

NPPES record last updated: April 29, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

About Dr. William Earle Bonis Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. WILLIAM EARLE BONIS MD (NPI 1689779209) is an individual hematology & oncology provider in Chico, California, licensed in California (A53478) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1689779209
Entity TypeIndividualMale
Primary Taxonomy207RH0003X
Provider Legal NameDR. WILLIAM EARLE BONISCredential: MD
Location Address265 COHASSET RDChico, CA 95926-2273
Mailing AddressPo Box 7555Chico, CA 95927-7555 · (530) 332-3890 · Fax (530) 893-6907
Phone(530) 332-3890
Fax(530) 893-6907
Sole ProprietorYes
Medical School CMSOtherGraduated 1990
Enumeration DateSeptember 14, 2006
Last NPPES UpdateApril 29, 2026
NPPES CertifiedApril 29, 2026
✔ NPI 1689779209 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
Licenses✔ Licensed in CA · A53478✔ Licensed in WA · MD61518247
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
265 COHASSET RD, Chico, CA 95926
Open in Google Maps ↗

Secondary Practice Locations 2

Location 1834 Sheridan StPort Townsend, WA 98368-2443 · Phone (360) 344-3091 · Fax (360) 344-3082
Location 22000 Hospital DrSedro Woolley, WA 98284-4327 · Phone (360) 856-7588 · Fax (360) 856-7252

Other Identifiers 1

Medicaid1689779209CA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Premera Blue Cross Blue Shield of Alaska, Providence Health Plan.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. William Earle Bonis Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4587675178
PECOS Enrollment IDI20060510000546
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
33 services31 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Swedish Medical Center

Acute Care Hospitals · Seattle, WA
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500027
Location747 BroadwaySeattle, WA 98122 · King County
Emergency services Birthing friendly

Jefferson Healthcare

Critical Access Hospitals · Port Townsend, WA
4/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number501323
Location834 Sheridan StreetPort Townsend, WA 98368 · Jefferson County
Emergency services Birthing friendly

Peacehealth United General Medical Center

Critical Access Hospitals · Sedro Woolley, WA
3/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number501329
Location2000 Hospital DriveSedro Woolley, WA 98284 · Skagit County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95926 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$176.60 typical visit price
range $58.87 – $176.60
Typical copayment $44.15 (range $14.71 – $44.15)
Most-billed visit code 99205
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 17

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

RUBENS BARROS COSTA FILHO MD
Internal Medicine (Hematology & Oncology)
265 COHASSET RD
CHICO, CA 95926
Butte County (530) 332-4700
DR. SAM MAZJ MD
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 170
CHICO, CA 95926
Butte County (530) 893-2323
DANA DOMINGUEZ
Surgery (Surgical Oncology)
265 COHASSET RD
CHICO, CA 95926
Butte County (530) 332-4700
MRS. KALYN BURNELL RD
Dietitian, Registered
265 COHASSET RD
CHICO, CA 95926
Butte County (530) 332-3917
DR. JOHN A HAYWARD MD
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 150
CHICO, CA 95926
Butte County (530) 899-9000
DEBRA C GARLEY MD
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 170
CHICO, CA 95926
Butte County (530) 893-2323
CHICO HEMATOLOGY ONCOLOGY
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE170
CHICO, CA 95926
Butte County (530) 893-2323
YUAN YING M.D,
Internal Medicine (Hematology & Oncology)
265 COHASSET RD
CHICO, CA 95926
Butte County (530) 332-4700

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is William Bonis's NPI number?

The NPI number for William Bonis is 1689779209. It was assigned to this individual provider in the NPPES registry on September 14, 2006.

Where is William Bonis located?

William Bonis practices at 265 Cohasset Rd, Chico, CA 95926. The listed phone number is (530) 332-3890.

What is William Bonis's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is William Bonis enrolled in Medicare?

Yes. William Bonis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does William Bonis accept?

Health plans from Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list William Bonis as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is William Bonis affiliated with any hospitals?

According to CMS data, William Bonis is affiliated with Swedish Medical Center, Jefferson Healthcare and Peacehealth United General Medical Center.

When was this NPI record last updated?

The NPPES record for William Bonis was last updated on April 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.