2026 NPPES data Medical Physician Assistant NPI 1831170158 PA C
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KAY BROOKS, PA C

Medical Physician Assistant in CHEHALIS, 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
641
Medicare Part D claims · 118 beneficiaries · Medical Physician Assistant avg: 1K
Generic prescribing
87%
generic claims · 13% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: KAY BROOKS, PA C is a Medical Physician Assistant ([object Object]) practicing in CHEHALIS, Washington with a Medicare Part D prescribing footprint of 641 claims across 118 beneficiaries — 13% brand-name prescribing .

What stands out: KAY BROOKS, PA C filed 641 Medicare Part D claims in 2023 across CHEHALIS, Washington. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

KAY BROOKS, PA C at a glance

Quality data not reported

NPI registry status

Active

Issued 11/14/2005

NPI 1831170158

Primary specialty

Medical Physician Assistant

Mid-sized

40,527 US NPIs in this specialty

Medicare Part D claims

641 40% 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).

KAY BROOKS, PA C is a Medical Physician Assistant provider practicing in CHEHALIS, Washington, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: PA C. NPI: 1831170158. 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.

KAY BROOKS, PA C appears in the CMS NPPES registry as a Medical Physician Assistant provider holding PA C credentials at 4254 JACKSON HWY, CHEHALIS, WA, 98532, with a listed phone of (360) 262-3966. NPI 1831170158 was issued on 11/14/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BROOKS 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 641 prescription claims written by this provider, covering 118 Medicare beneficiaries and totaling roughly $73K in drug spend, split 13% brand-name and 87% generic by claim count. 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

4254 JACKSON HWY
CHEHALIS, WA 98532

Provider Details

NPI 1831170158
Specialty Medical Physician Assistant
Credentials PA C
Gender Female
NPI Issued 11/14/2005

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 KAY BROOKS, PA C. To verify KAY BROOKS, 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

KAY BROOKS, PA C — brand share 13.0%
Specialty average (est.)

13% brand-name claims vs 87% generic, on 641 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.

641
Total Claims
$73K
Total Drug Cost
118
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,448
Total Day Supply
43,213
Brand vs Generic
13% brand / 87% generic
Brand Drug Cost
$62K
Generic Drug Cost
$10K

Patient Demographics

Average Patient Age
71.7 years
Avg HCC Risk Score
1.14
Gender Split
64% female / 36% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Levothyroxine Sodium
58
Atorvastatin Calcium
52
Losartan Potassium
40
Lisinopril
36
Rosuvastatin Calcium
27
Metformin Hcl Er
Metformin Hcl
26
Amlodipine Besylate
25
Fluticasone Propionate
16
Ezetimibe
15
Tamsulosin Hcl
15

* 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 KAY BROOKS, 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

KAY BROOKS, PA C's 641 claims are below 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 BROOKS.

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

Frequently Asked Questions

What is KAY BROOKS, PA C's specialty?
KAY BROOKS, PA C specializes in Medical Physician Assistant and practices in CHEHALIS, Washington. Credentials: PA C.
How much does KAY BROOKS, PA C prescribe under Medicare Part D?
In 2023, KAY BROOKS, PA C wrote 641 Medicare Part D claims totaling $73K in drug costs for 118 beneficiaries.
Where is KAY BROOKS, PA C located?
KAY BROOKS, PA C is located at 4254 JACKSON HWY, CHEHALIS, WA, 98532. Phone: (360) 262-3966.
What is KAY BROOKS, PA C's NPI number?
KAY BROOKS, PA C's National Provider Identifier (NPI) is 1831170158, issued on 11/14/2005.
Does KAY BROOKS, PA C prescribe more brand-name or generic drugs?
KAY BROOKS, PA C's prescribing is 13% brand-name and 87% generic drugs by claim count, with $62K in brand drug costs.
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 KAY BROOKS, PA C prescribe most often?
Based on 2023 Medicare Part D data, KAY BROOKS, PA C's most frequently prescribed drugs include Levothyroxine Sodium, Atorvastatin Calcium, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does KAY BROOKS, PA C accept Medicare?
KAY BROOKS, PA C appears in CMS Medicare data with 641 Part D claims and 118 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify KAY BROOKS, PA C's credentials?
KAY BROOKS, PA C's NPI is 1831170158 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