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

NPI Status: Active since September 14, 2006

Contact Information

265 COHASSET RD
CHICO, CA
ZIP 95926
Phone: (530) 332-3890
Fax: (530) 893-6907

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  • Individual
  • Male
  • Years of Experience 36
  • Internal Medicine
  • Hematology & Oncology
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About WILLIAM BONIS

This page provides the complete NPI Profile along with additional information for William Bonis, an internist established in Chico, California with a medical specialization in Internal Medicine, focusing in hematology & oncology and more than 36 years of experience. The healthcare provider is registered in the NPI registry with number 1689779209 assigned on September 2006. The practitioner's primary taxonomy code is 207RH0003X with license number A53478 (CA). The provider is registered as an individual and his NPI record was last updated April 2026.

NPI
1689779209
Provider Name
DR. WILLIAM EARLE BONIS MD
Gender
Male
Entity Type
Individual
Location Address
265 COHASSET RD CHICO, CA 95926
Location Phone
(530) 332-3890
Location Fax
(530) 893-6907
Mailing Address
PO BOX 7555 CHICO, CA 95927
Mailing Phone
(530) 332-3890
Mailing Fax
(530) 893-6907
Medical School Name
OTHER
Graduation Year
1990
Is Sole Proprietor?
Yes
Enumeration Date
09-14-2006
Last Update Date
04-29-2026
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An internist like William Bonis is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Secondary Locations

  • 2000 Hospital Dr
    Sedro Woolley, WA 98284
    (360) 856-7588
  • 834 Sheridan St
    Port Townsend, WA 98368
    (360) 344-3091

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine Hematology & Oncology

Taxonomy Code
207RH0003X
Type
Allopathic & Osteopathic Physicians
License No.
A53478
License State
CA
Taxonomy Description
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207RH0003XAllopathic & Osteopathic Physicians

Internal Medicine
Hematology & Oncology

MD61518247 (WA)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Premera Blue Cross Alaska One Gold - PPO
  • Premera Blue Cross Preferred Bronze 5800 HSA - PPO
  • Premera Blue Cross Preferred Bronze 6350 - PPO
  • Premera Blue Cross Preferred Gold 1500 - PPO
  • Premera Blue Cross Preferred Silver 4500 - PPO
  • Premera Blue Cross Standard Bronze II - PPO
  • Premera Blue Cross Standard Gold - PPO
  • Premera Blue Cross Standard Silver - PPO
  • Premera Blue Cross Family Dental - PPO
  • Premera Blue Cross Pediatric Dental - PPO
  • HSA-E Qualified 7500 Bronze - Signature Network - EPO
  • Providence Oregon Standard Bronze Plan - Signature Network - EPO
  • Providence Oregon Standard Gold Plan - Signature Network - EPO
  • Providence Oregon Standard Silver Plan - Signature Network - EPO

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
1689779209MEDICAID (05)CA 

Medicare Participation & PECOS Enrollment Status

William Bonis is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

William Bonis is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 4587675178

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20060510000546

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Established patient office or other outpatient visit, 30-39 minutes

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.

This service was performed 234 times for 163 patients

New patient office or other outpatient visit, 45-59 minutes

This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.

This service was performed 12 times for 12 patients

New patient office or other outpatient visit, 60-74 minutes

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

This service was performed 11 times for 11 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $44.15 for a new patient copayment and $25.84 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 95926 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99205

  • Average New Patient Price $176.6
  • Minimum New Patient Price $58.87
  • Maximum New Patient Price $176.6
  • Average New Patient Copayment $44.15
  • Minimum New Patient Copayment $14.71
  • Maximum New Patient Copayment $44.15

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $103.36
  • Minimum Established Patient Price $19.28
  • Maximum Established Patient Price $144.6
  • Average Established Patient Copayment $25.84
  • Minimum Established Patient Copayment $4.82
  • Maximum Established Patient Copayment $36.15

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. William Bonis is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
SWEDISH MEDICAL CENTER747 BROADWAY
SEATTLE, WA 98122
(206) 386-6000Acute Care Hospitals
SWEDISH ISSAQUAH751 NE BLAKELY DR
ISSAQUAH, WA 98029
(425) 313-4000Acute Care Hospitals
PEACEHEALTH UNITED GENERAL MEDICAL CENTER2000 HOSPITAL DRIVE
SEDRO WOOLLEY, WA 98284
(360) 856-6021Critical Access Hospitals

Reviews for DR. WILLIAM EARLE BONIS MD

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1689779209, we treat the final digit (9) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 71. The final step is to find the difference between that total and the next multiple of ten (80 - 71 = 9).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
6
Unchanged
Pos 3
8
Doubled → 16 → 1 + 6
Pos 4
9
Unchanged
Pos 5
7
Doubled → 14 → 1 + 4
Pos 6
7
Unchanged
Pos 7
9
Doubled → 18 → 1 + 8
Pos 8
2
Unchanged
Pos 9
0
Doubled → 0
Check
9
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 8 → 16 → 7 7 → 14 → 5 9 → 18 → 9 0 → 0

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 6 + 1 + 6 + 9 + 1 + 4 + 7 + 1 + 8 + 2 + 0 + 24 = 71

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 71 is 80. The difference is the calculated check digit.

80 - 71 = 9
This NPI is valid
The calculated check digit is 9, which matches the last digit of 1689779209.

Other Providers at the Same Location


The following 17 providers are registered at the same or a nearby location.

Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 150
CHICO, CA 95926
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 170
CHICO, CA 95926
Radiology (Radiation Oncology)
265 COHASSET RD, SUITE # 140
CHICO, CA 95926
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE 170
CHICO, CA 95926
Nurse Practitioner
265 COHASSET RD, SUITE 150
CHICO, CA 95926
Specialist
265 COHASSET RD, SUITE 170
CHICO, CA 95926
Internal Medicine (Medical Oncology)
265 COHASSET RD, STE 150
CHICO, CA 95926
Internal Medicine (Hematology & Oncology)
265 COHASSET RD, SUITE170
CHICO, CA 95926
Internal Medicine (Hematology & Oncology)
265 COHASSET RD
CHICO, CA 95926
Dietitian, Registered (Nutrition, Oncology)
265 COHASSET RD
CHICO, CA 95926
Internal Medicine (Hematology & Oncology)
265 COHASSET RD
CHICO, CA 95926
Internal Medicine (Medical Oncology)
265 COHASSET RD
CHICO, CA 95926
Dietitian, Registered
265 COHASSET RD
CHICO, CA 95926
Radiology (Radiation Oncology)
265 COHASSET RD, SUITE 140
CHICO, CA 95926
Radiology (Radiation Oncology)
265 COHASSET RD
CHICO, CA 95926
Radiology (Radiation Oncology)
265 COHASSET RD
CHICO, CA 95926
Surgery (Surgical Oncology)
265 COHASSET RD
CHICO, CA 95926

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1689779209, enumerated as an "individual" on September 14, 2006.

The provider is located at 265 COHASSET RD CHICO, CA 95926 and the phone number is (530) 332-3890.

Internal Medicine with taxonomy code 207RH0003X and a focus in Hematology & Oncology.

The provider might be accepting Accepts: Premera Blue Cross Blue Shield of Alaska,. Please consult your insurance carrier or call the provider to verify.

William Bonis is affiliated with: SWEDISH MEDICAL CENTER, SWEDISH ISSAQUAH and PEACEHEALTH UNITED GENERAL MEDICAL CENTER.