2026 NPPES data Physician Assistant NPI 1881858157 PA-C
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MARGARET BAKER, PA-C

Physician Assistant in UNION GROVE, Wisconsin. 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
1K
Medicare Part D claims · 137 beneficiaries · Physician Assistant avg: 790
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: MARGARET BAKER, PA-C is a Physician Assistant ([object Object]) practicing in UNION GROVE, Wisconsin with a Medicare Part D prescribing footprint of 1K claims across 137 beneficiaries — 3% brand-name prescribing .

What stands out: MARGARET BAKER, PA-C filed 1,305 Medicare Part D claims in 2023 across UNION GROVE, Wisconsin. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

MARGARET BAKER, PA-C at a glance

Quality data not reported

NPI registry status

Active

Issued 07/15/2008

NPI 1881858157

Primary specialty

Physician Assistant

High-volume

149,975 US NPIs in this specialty

Medicare Part D claims

1,305 65% vs specialty avg

2023 prescription claims

Specialty avg: 790

Specialty distribution in Wisconsin

How Physician Assistant compares to other specialties among Wisconsin providers

Wisconsin providers

Physician Assistant share within Wisconsin

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

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (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).

MARGARET BAKER, PA-C is a Physician Assistant provider practicing in UNION GROVE, Wisconsin, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: PA-C. NPI: 1881858157. 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.

MARGARET BAKER, PA-C appears in the CMS NPPES registry as a Physician Assistant provider holding PA-C credentials at 1120 MAIN ST, UNION GROVE, WI, 53182, with a listed phone of (262) 878-4424. NPI 1881858157 was issued on 07/15/2008. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what BAKER 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 1,305 prescription claims written by this provider, covering 137 Medicare beneficiaries and totaling roughly $53K in drug spend, split 3% brand-name and 97% 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.

Physician Assistant is a high-volume specialty nationwide, with 149,975 enrolled providers across 56 states and an average of 790 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

1120 MAIN ST
UNION GROVE, WI 53182

Provider Details

NPI 1881858157
Specialty Physician Assistant
Credentials PA-C
Gender Female
NPI Issued 07/15/2008

Hospital and facility affiliations

Facilities where MARGARET BAKER, 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.

BCS OF WISCONSIN SC
PEWAUKEE, WI

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

Brand vs generic prescribing mix · Generic-heavy

MARGARET BAKER, PA-C — brand share 3.0%
Specialty average (est.)

3% brand-name claims vs 97% generic, on 1,305 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.

1,305
Total Claims
$53K
Total Drug Cost
137
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
1,307
Total Day Supply
34,825
Brand vs Generic
3% brand / 97% generic
Brand Drug Cost
$13K
Generic Drug Cost
$40K

Patient Demographics

Average Patient Age
74.7 years
Avg HCC Risk Score
2.55
Gender Split
62% female / 38% male
Age Distribution
<65: 28, 65-74: 37, 75-84: 37, 85+: 35

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Sertraline Hcl
261
Divalproex Sodium
125
Lorazepam
119
Mirtazapine
109
Quetiapine Fumarate
95
Buspirone Hcl
67
Duloxetine Hcl
55
Trazodone Hcl
53
Olanzapine
43
Venlafaxine Hcl Er
Venlafaxine Hcl
43

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

Physician Assistant Overview

How MARGARET BAKER, PA-C fits within the Physician Assistant landscape nationally.

149,975
Physician Assistant Providers in US
56
States with Physician Assistant
790
Avg Claims per Provider

MARGARET BAKER, PA-C's 1,305 claims are above the specialty average of 790.

Nearby Physician Assistant Providers in Wisconsin

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

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

Frequently Asked Questions

What is MARGARET BAKER, PA-C's specialty?
MARGARET BAKER, PA-C specializes in Physician Assistant and practices in UNION GROVE, Wisconsin. Credentials: PA-C.
How much does MARGARET BAKER, PA-C prescribe under Medicare Part D?
In 2023, MARGARET BAKER, PA-C wrote 1,305 Medicare Part D claims totaling $53K in drug costs for 137 beneficiaries.
Where is MARGARET BAKER, PA-C located?
MARGARET BAKER, PA-C is located at 1120 MAIN ST, UNION GROVE, WI, 53182. Phone: (262) 878-4424.
What is MARGARET BAKER, PA-C's NPI number?
MARGARET BAKER, PA-C's National Provider Identifier (NPI) is 1881858157, issued on 07/15/2008.
Does MARGARET BAKER, PA-C prescribe more brand-name or generic drugs?
MARGARET BAKER, PA-C's prescribing is 3% brand-name and 97% generic drugs by claim count, with $13K in brand drug costs.
How many Physician Assistant providers are there in the US?
There are 149,975 Physician Assistant providers across 56 states in the US. The average Physician Assistant provider writes 790 Medicare Part D claims per year.
What drugs does MARGARET BAKER, PA-C prescribe most often?
Based on 2023 Medicare Part D data, MARGARET BAKER, PA-C's most frequently prescribed drugs include Sertraline Hcl, Divalproex Sodium, Lorazepam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARGARET BAKER, PA-C accept Medicare?
MARGARET BAKER, PA-C appears in CMS Medicare data with 1,305 Part D claims and 137 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARGARET BAKER, PA-C's credentials?
MARGARET BAKER, PA-C's NPI is 1881858157 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