2026 NPPES data Physician Assistant NPI 1821583329 PA-C
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JOHN CARTER, PA-C

Physician Assistant in STAUNTON, Virginia. 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
5K
Medicare Part D claims · 242 beneficiaries · Physician Assistant avg: 790
Generic prescribing
94%
generic claims · 6% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$30.7K
261 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

JOHN CARTER, PA-C filed 4,656 Medicare Part D claims in 2023 as a Physician Assistant in STAUNTON, Virginia, prescribing 94% generic.

5K
Part D claims, 2023
94%
generic prescribing
$30.7K
industry payments (Sunshine Act)

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.

JOHN CARTER, PA-C's Medicare Part D volume vs every U.S. prescriber

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

4,656 Top 7% higher than 93% 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%). Below this entry. 600–800: 56,224 prescribers (4%). Below this entry. 800–1,000: 40,919 prescribers (3%). Below this entry. 1,000–1,200: 31,827 prescribers (2%). Below this entry. 1,200–1,400: 26,224 prescribers (2%). Below this entry. 1,400–1,600: 21,710 prescribers (2%). Below this entry. 1,600–1,800: 19,072 prescribers (1%). Below this entry. 1,800–2,000: 16,451 prescribers (1%). Below this entry. 2,000–2,200: 213,991 prescribers (16%). This entry sits in this band. 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 JOHN CARTER, PA-C?

Quality data not reported

NPI registry status

Active

Issued 06/27/2018

NPI 1821583329

Primary specialty

Physician Assistant

High-volume

149,975 US NPIs in this specialty

Medicare Part D claims

4,656 489% vs specialty avg

2023 prescription claims

Specialty avg: 790

Specialty distribution in Virginia

How Physician Assistant compares to other specialties among Virginia providers

Virginia providers

Physician Assistant share within Virginia

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

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).

JOHN CARTER, PA-C appears in the CMS NPPES registry as a Physician Assistant provider holding PA-C credentials at 25 MYERS CORNER DR, STAUNTON, VA, 24401, with a listed phone of (540) 688-2646. NPI 1821583329 was issued on 06/27/2018. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what CARTER 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 4,656 prescription claims written by this provider, covering 242 Medicare beneficiaries and totaling roughly $740K in drug spend, split 6% brand-name and 94% 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

25 MYERS CORNER DR
STAUNTON, VA 24401

Provider Details

NPI 1821583329
Specialty Physician Assistant
Credentials PA-C
Gender Male
NPI Issued 06/27/2018

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for JOHN CARTER, PA-C. Source: openpaymentsdata.cms.gov.

Total received

$30.7K

Largest payer

Neurocrine Biosciences, Inc.

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Brand vs generic prescribing mix · Generic-heavy

JOHN CARTER, PA-C — brand share 6.0%
Specialty average (est.)

6% brand-name claims vs 94% generic, on 4,656 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.

4,656
Total Claims
$740K
Total Drug Cost
242
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
6,023
Total Day Supply
173,059
Brand vs Generic
6% brand / 94% generic
Brand Drug Cost
$548K
Generic Drug Cost
$192K

Patient Demographics

Average Patient Age
63.1 years
Avg HCC Risk Score
1.36
Gender Split
62% female / 38% male
Age Distribution
<65: 114, 65-74: 77, 75-84: 36, 85+: 15

Top Prescribed Drugs (Medicare Part D)

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

What JOHN CARTER, PA-C 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
Risperidone
412
Quetiapine Fumarate
250
Trazodone Hcl
235
Clonazepam
216
Aripiprazole
195
Duloxetine Hcl
195
Clozapine
192
Sertraline Hcl
162
Olanzapine
141
Escitalopram Oxalate
136

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

Physician Assistant Overview

How JOHN CARTER, 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

JOHN CARTER, PA-C's 4,656 claims are above the specialty average of 790.

Nearby Physician Assistant Providers in Virginia

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

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

Frequently Asked Questions

What is JOHN CARTER, PA-C's specialty?
JOHN CARTER, PA-C specializes in Physician Assistant and practices in STAUNTON, Virginia. Credentials: PA-C.
How much does JOHN CARTER, PA-C prescribe under Medicare Part D?
In 2023, JOHN CARTER, PA-C wrote 4,656 Medicare Part D claims totaling $740K in drug costs for 242 beneficiaries.
Where is JOHN CARTER, PA-C located?
JOHN CARTER, PA-C is located at 25 MYERS CORNER DR, STAUNTON, VA, 24401. Phone: (540) 688-2646.
What is JOHN CARTER, PA-C's NPI number?
JOHN CARTER, PA-C's National Provider Identifier (NPI) is 1821583329, issued on 06/27/2018.
Does JOHN CARTER, PA-C prescribe more brand-name or generic drugs?
JOHN CARTER, PA-C's prescribing is 6% brand-name and 94% generic drugs by claim count, with $548K 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 JOHN CARTER, PA-C prescribe most often?
Based on 2023 Medicare Part D data, JOHN CARTER, PA-C's most frequently prescribed drugs include Risperidone, Quetiapine Fumarate, Trazodone Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does JOHN CARTER, PA-C accept Medicare?
JOHN CARTER, PA-C appears in CMS Medicare data with 4,656 Part D claims and 242 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify JOHN CARTER, PA-C's credentials?
JOHN CARTER, PA-C's NPI is 1821583329 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