2026 NPPES data Physician Assistant NPI 1285791293 P.A.
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JEFFREY MCMAHON, P.A.

Physician Assistant in GROSSE POINTE WOODS, Michigan. 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
581
Medicare Part D claims · 124 beneficiaries · Physician Assistant avg: 790
Generic prescribing
72%
generic claims · 28% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

JEFFREY MCMAHON, P.A. filed 581 Medicare Part D claims in 2023 as a Physician Assistant in GROSSE POINTE WOODS, Michigan, prescribing 72% generic.

581
Part D claims, 2023
72%
generic prescribing

Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) — no proprietary rating or editorial opinion is applied.

JEFFREY MCMAHON, P.A.'s Medicare Part D volume vs every U.S. prescriber

Total Medicare Part D claims, 2023 — across all CMS prescribers nationally

581 Top 34% higher than 66% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). Below this entry. 200–400: 182,923 prescribers (13%). Below this entry. 400–600: 90,619 prescribers (7%). This entry sits in this band. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2,000–2,200: 213,991 prescribers (16%). Above this entry. This provider 0 2K+ every Part D prescriber (claims/yr), bucketed by value

Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source CMS Medicare Part D Prescriber Public Use File · 2023

What does the federal data show about JEFFREY MCMAHON, P.A.?

Quality data not reported

NPI registry status

Active

Issued 01/02/2007

NPI 1285791293

Primary specialty

Physician Assistant

High-volume

149,975 US NPIs in this specialty

Medicare Part D claims

581 26% vs specialty avg

2023 prescription claims

Specialty avg: 790

Specialty distribution in Michigan

How Physician Assistant compares to other specialties among Michigan providers

Michigan providers

Physician Assistant share within Michigan

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

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).

JEFFREY MCMAHON, P.A. appears in the CMS NPPES registry as a Physician Assistant provider holding P.A. credentials at 2021 ALLARD, GROSSE POINTE WOODS, MI, 48236, with a listed phone of (313) 417-3362. NPI 1285791293 was issued on 01/02/2007. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MCMAHON 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 581 prescription claims written by this provider, covering 124 Medicare beneficiaries and totaling roughly $2.1 million in drug spend, split 28% brand-name and 72% 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

2021 ALLARD
GROSSE POINTE WOODS, MI 48236

Provider Details

NPI 1285791293
Specialty Physician Assistant
Credentials P.A.
Gender Male
NPI Issued 01/02/2007

Hospital and facility affiliations

Facilities where JEFFREY MCMAHON, P.A. 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.

HENRY FORD HEALTH SYSTEM
DETROIT, MI

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 — Michigan MI-BOM 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 ~41K Michigan medical licensees in 2023 — they are NOT specific to JEFFREY MCMAHON, P.A.. To verify JEFFREY MCMAHON, P.A.'s current license status, search the MI-BOM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

123
Total board actions, Michigan 2023
Across 120 cases
3.00
Actions per 1,000 licensees
Michigan statewide rate
probation
Most common action type
44 cases

MI-BOM 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 Michigan disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Above average

JEFFREY MCMAHON, P.A. — brand share 28.0%
Specialty average (est.)

28% brand-name claims vs 72% generic, on 581 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.

581
Total Claims
$2.1M
Total Drug Cost
124
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
826
Total Day Supply
23,899
Brand vs Generic
28% brand / 72% generic
Brand Drug Cost
$2.1M
Generic Drug Cost
$22K
Antibiotic Claims
31

Patient Demographics

Average Patient Age
67.1 years
Avg HCC Risk Score
2.46
Gender Split
52% female / 48% male
Age Distribution
<65: 32, 65-74: 67, 75-84: N/A, 85+: N/A

Top Prescribed Drugs (Medicare Part D)

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

What JEFFREY MCMAHON, P.A. prescribes most

Top Medicare Part D drugs by claim count, 2023

claims
Source CMS Medicare Part D Prescriber Public Use File As of 2023
Drug Claims
Spironolactone
62
Furosemide
58
Epclusa
Sofosbuvir/Velpatasvir
51
Ursodiol
44
Vemlidy
Tenofovir Alafenamide
41
Azathioprine
37
Mavyret
Glecaprevir/Pibrentasvir
33
Lactulose
24
Propranolol Hcl
23
Entecavir
21

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

Physician Assistant Overview

How JEFFREY MCMAHON, P.A. fits within the Physician Assistant landscape nationally.

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

JEFFREY MCMAHON, P.A.'s 581 claims are below the specialty average of 790.

Nearby Physician Assistant Providers in Michigan

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

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

Frequently Asked Questions

What is JEFFREY MCMAHON, P.A.'s specialty?
JEFFREY MCMAHON, P.A. specializes in Physician Assistant and practices in GROSSE POINTE WOODS, Michigan. Credentials: P.A..
How much does JEFFREY MCMAHON, P.A. prescribe under Medicare Part D?
In 2023, JEFFREY MCMAHON, P.A. wrote 581 Medicare Part D claims totaling $2.1M in drug costs for 124 beneficiaries.
Where is JEFFREY MCMAHON, P.A. located?
JEFFREY MCMAHON, P.A. is located at 2021 ALLARD, GROSSE POINTE WOODS, MI, 48236. Phone: (313) 417-3362.
What is JEFFREY MCMAHON, P.A.'s NPI number?
JEFFREY MCMAHON, P.A.'s National Provider Identifier (NPI) is 1285791293, issued on 01/02/2007.
Does JEFFREY MCMAHON, P.A. prescribe more brand-name or generic drugs?
JEFFREY MCMAHON, P.A.'s prescribing is 28% brand-name and 72% generic drugs by claim count, with $2.1M 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 JEFFREY MCMAHON, P.A. prescribe most often?
Based on 2023 Medicare Part D data, JEFFREY MCMAHON, P.A.'s most frequently prescribed drugs include Spironolactone, Furosemide, Epclusa. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JEFFREY MCMAHON, P.A. accept Medicare?
JEFFREY MCMAHON, P.A. appears in CMS Medicare data with 581 Part D claims and 124 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JEFFREY MCMAHON, P.A.'s credentials?
JEFFREY MCMAHON, P.A.'s NPI is 1285791293 with credentials P.A.. 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