2026 NPPES data Medical Physician Assistant NPI 1639194079 PA-C
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WILLIAM BOMBERGER, PA-C

Medical Physician Assistant in SPOKANE, Washington. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
6K
Medicare Part D claims · 300 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: WILLIAM BOMBERGER, PA-C is a Medical Physician Assistant ([object Object]) practicing in SPOKANE, Washington with a Medicare Part D prescribing footprint of 6K claims across 300 beneficiaries — 19% brand-name prescribing .

What stands out: WILLIAM BOMBERGER, PA-C filed 5,778 Medicare Part D claims in 2023 across SPOKANE, Washington. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

WILLIAM BOMBERGER, PA-C at a glance

Quality data not reported

NPI registry status

Active

Issued 07/13/2006

NPI 1639194079

Primary specialty

Medical Physician Assistant

Mid-sized

40,527 US NPIs in this specialty

Medicare Part D claims

5,778 436% vs specialty avg

2023 prescription claims

Specialty avg: 1,077

Specialty distribution in Washington

How Medical Physician Assistant compares to other specialties among Washington providers

Washington providers

Medical Physician Assistant share within Washington

1. Medical Physician Assistant42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Medical Physician Assistant share within Washington

Specialty board-certification context

Estimated specialty board-certified rate — Medical Physician Assistant (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Medical Physician Assistant ABMS/AOA estimate

Est. board-certified rate (Medical Physician Assistant) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Medical Physician Assistant) — ABMS / AOA estimate

The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.

Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).

WILLIAM BOMBERGER, PA-C is a Medical Physician Assistant provider practicing in SPOKANE, Washington, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: PA-C. NPI: 1639194079. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

WILLIAM BOMBERGER, PA-C appears in the CMS NPPES registry as a Medical Physician Assistant provider holding PA-C credentials at 1001 W 2ND AVE, SPOKANE, WA, 99201, with a listed phone of (509) 835-1205. NPI 1639194079 was issued on 07/13/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BOMBERGER most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 5,778 prescription claims written by this provider, covering 300 Medicare beneficiaries and totaling roughly $941K in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 2.5%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Medical Physician Assistant is a mid-sized specialty nationwide, with 40,527 enrolled providers across 55 states and an average of 1,077 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline. Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist — always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.

Practice Address

1001 W 2ND AVE
SPOKANE, WA 99201

Provider Details

NPI 1639194079
Specialty Medical Physician Assistant
Credentials PA-C
Gender Male
NPI Issued 07/13/2006

Hospital and facility affiliations

Facilities where WILLIAM BOMBERGER, PA-C bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" — a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.

COMMUNITY HEALTH ASSOCIATION OF SPOKANE
SPOKANE, WA

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

License & disciplinary context — Washington WMC 2023 annual report

Aggregate state board data only — NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~34K Washington medical licensees in 2023 — they are NOT specific to WILLIAM BOMBERGER, PA-C. To verify WILLIAM BOMBERGER, PA-C's current license status, search the WMC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

88
Total board actions, Washington 2023
Across 85 cases
2.59
Actions per 1,000 licensees
Washington statewide rate
probation
Most common action type
31 cases

WMC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Washington disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Typical

WILLIAM BOMBERGER, PA-C — brand share 19.0%
Specialty average (est.)

19% brand-name claims vs 81% generic, on 5,778 2023 Medicare Part D claims.

The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

5,778
Total Claims
$941K
Total Drug Cost
300
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
10,021
Total Day Supply
287,089
Brand vs Generic
19% brand / 81% generic
Brand Drug Cost
$819K
Generic Drug Cost
$119K
Opioid Claims
147 (2.5% rate)
Antibiotic Claims
56

Patient Demographics

Average Patient Age
61.5 years
Avg HCC Risk Score
1.43
Gender Split
42% female / 58% male
Age Distribution
<65: 146, 65-74: 128, 75-84: 26, 85+: 0

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Atorvastatin Calcium
438
Lisinopril
236
Albuterol Sulfate Hfa
Albuterol Sulfate
199
Gabapentin
184
Amlodipine Besylate
147
Omeprazole
132
Losartan Potassium
124
Metformin Hcl Er
Metformin Hcl
109
Hydrochlorothiazide
102
Famotidine
100

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Medical Physician Assistant Overview

How WILLIAM BOMBERGER, PA-C fits within the Medical Physician Assistant landscape nationally.

40,527
Medical Physician Assistant Providers in US
55
States with Medical Physician Assistant
1,077
Avg Claims per Provider

WILLIAM BOMBERGER, PA-C's 5,778 claims are above the specialty average of 1,077.

Nearby Medical Physician Assistant Providers in Washington

Other clinicians with the same primary specialty enrolled in Washington, drawn from the same CMS NPPES roster as BOMBERGER.

Compare Medical Physician Assistant nationally: see state-by-state distribution →

Frequently Asked Questions

What is WILLIAM BOMBERGER, PA-C's specialty?
WILLIAM BOMBERGER, PA-C specializes in Medical Physician Assistant and practices in SPOKANE, Washington. Credentials: PA-C.
How much does WILLIAM BOMBERGER, PA-C prescribe under Medicare Part D?
In 2023, WILLIAM BOMBERGER, PA-C wrote 5,778 Medicare Part D claims totaling $941K in drug costs for 300 beneficiaries.
Where is WILLIAM BOMBERGER, PA-C located?
WILLIAM BOMBERGER, PA-C is located at 1001 W 2ND AVE, SPOKANE, WA, 99201. Phone: (509) 835-1205.
What is WILLIAM BOMBERGER, PA-C's NPI number?
WILLIAM BOMBERGER, PA-C's National Provider Identifier (NPI) is 1639194079, issued on 07/13/2006.
Does WILLIAM BOMBERGER, PA-C prescribe more brand-name or generic drugs?
WILLIAM BOMBERGER, PA-C's prescribing is 19% brand-name and 81% generic drugs by claim count, with $819K in brand drug costs.
Does WILLIAM BOMBERGER, PA-C prescribe opioids?
Yes, WILLIAM BOMBERGER, PA-C had 147 opioid claims in 2023 with an opioid prescribing rate of 2.5%.
How many Medical Physician Assistant providers are there in the US?
There are 40,527 Medical Physician Assistant providers across 55 states in the US. The average Medical Physician Assistant provider writes 1,077 Medicare Part D claims per year.
What drugs does WILLIAM BOMBERGER, PA-C prescribe most often?
Based on 2023 Medicare Part D data, WILLIAM BOMBERGER, PA-C's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Albuterol Sulfate Hfa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does WILLIAM BOMBERGER, PA-C accept Medicare?
WILLIAM BOMBERGER, PA-C appears in CMS Medicare data with 5,778 Part D claims and 300 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WILLIAM BOMBERGER, PA-C's credentials?
WILLIAM BOMBERGER, PA-C's NPI is 1639194079 with credentials PA-C. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.

Data Sources

Provider Directory
CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
Specialty Classification
NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
Prescribing Data
CMS Medicare Part D Prescriber Public Use File (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
Limitations
Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.

See our complete data methodology for details on how we collect and process government data.

Data as of April 2026 (NPPES) / 2023 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).

Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology