2026 NPPES data Physician Assistant NPI 1568029437 PHYSICIAN ASSISTANT
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KELLY DIAZ, PHYSICIAN ASSISTANT

Physician Assistant in CHARLTON, Massachusetts. 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
2K
Medicare Part D claims · 285 beneficiaries · Physician Assistant avg: 790
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$302.07
9 payments · CMS Open Payments (Sunshine Act)

What the federal data shows

KELLY DIAZ, PHYSICIAN ASSISTANT filed 1,849 Medicare Part D claims in 2023 as a Physician Assistant in CHARLTON, Massachusetts, prescribing 91% generic.

2K
Part D claims, 2023
91%
generic prescribing
$302.07
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.

KELLY DIAZ, PHYSICIAN ASSISTANT's Medicare Part D volume vs every U.S. prescriber

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

1,849 Top 17% higher than 83% 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%). This entry sits in this band. 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 KELLY DIAZ, PHYSICIAN ASSISTANT?

Quality data not reported

NPI registry status

Active

Issued 05/24/2019

NPI 1568029437

Primary specialty

Physician Assistant

High-volume

149,975 US NPIs in this specialty

Medicare Part D claims

1,849 134% vs specialty avg

2023 prescription claims

Specialty avg: 790

Specialty distribution in Massachusetts

How Physician Assistant compares to other specialties among Massachusetts providers

Massachusetts providers

Physician Assistant share within Massachusetts

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

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).

KELLY DIAZ, PHYSICIAN ASSISTANT appears in the CMS NPPES registry as a Physician Assistant provider holding PHYSICIAN ASSISTANT credentials at 10 N MAIN ST, CHARLTON, MA, 01507, with a listed phone of (508) 248-1770. NPI 1568029437 was issued on 05/24/2019. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DIAZ 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 1,849 prescription claims written by this provider, covering 285 Medicare beneficiaries and totaling roughly $173K in drug spend, split 9% brand-name and 91% 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

10 N MAIN ST
CHARLTON, MA 01507

Provider Details

NPI 1568029437
Specialty Physician Assistant
Credentials PHYSICIAN ASSISTANT
Gender Female
NPI Issued 05/24/2019

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 KELLY DIAZ, PHYSICIAN ASSISTANT. Source: openpaymentsdata.cms.gov.

Total received

$302

Largest payer

Medtronic, 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.

License & disciplinary context — Massachusetts BORIM 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 ~38K Massachusetts medical licensees in 2023 — they are NOT specific to KELLY DIAZ, PHYSICIAN ASSISTANT. To verify KELLY DIAZ, PHYSICIAN ASSISTANT's current license status, search the BORIM public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.

80
Total board actions, Massachusetts 2023
Across 78 cases
2.11
Actions per 1,000 licensees
Massachusetts statewide rate
probation
Most common action type
29 cases

BORIM 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 Massachusetts disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.

Brand vs generic prescribing mix · Generic-heavy

KELLY DIAZ, PHYSICIAN ASSISTANT — brand share 9.0%
Specialty average (est.)

9% brand-name claims vs 91% generic, on 1,849 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.

1,849
Total Claims
$173K
Total Drug Cost
285
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
4,127
Total Day Supply
119,439
Brand vs Generic
9% brand / 91% generic
Brand Drug Cost
$129K
Generic Drug Cost
$44K
Antibiotic Claims
56

Patient Demographics

Average Patient Age
73.1 years
Avg HCC Risk Score
0.88
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.

What KELLY DIAZ, PHYSICIAN ASSISTANT 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
Atorvastatin Calcium
126
Levothyroxine Sodium
114
Lisinopril
102
Losartan Potassium
83
Simvastatin
70
Hydrochlorothiazide
65
Atenolol
64
Amlodipine Besylate
61
Gabapentin
54
Sertraline Hcl
52

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

Physician Assistant Overview

How KELLY DIAZ, PHYSICIAN ASSISTANT fits within the Physician Assistant landscape nationally.

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

KELLY DIAZ, PHYSICIAN ASSISTANT's 1,849 claims are above the specialty average of 790.

Nearby Physician Assistant Providers in Massachusetts

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

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

Frequently Asked Questions

What is KELLY DIAZ, PHYSICIAN ASSISTANT's specialty?
KELLY DIAZ, PHYSICIAN ASSISTANT specializes in Physician Assistant and practices in CHARLTON, Massachusetts. Credentials: PHYSICIAN ASSISTANT.
How much does KELLY DIAZ, PHYSICIAN ASSISTANT prescribe under Medicare Part D?
In 2023, KELLY DIAZ, PHYSICIAN ASSISTANT wrote 1,849 Medicare Part D claims totaling $173K in drug costs for 285 beneficiaries.
Where is KELLY DIAZ, PHYSICIAN ASSISTANT located?
KELLY DIAZ, PHYSICIAN ASSISTANT is located at 10 N MAIN ST, CHARLTON, MA, 01507. Phone: (508) 248-1770.
What is KELLY DIAZ, PHYSICIAN ASSISTANT's NPI number?
KELLY DIAZ, PHYSICIAN ASSISTANT's National Provider Identifier (NPI) is 1568029437, issued on 05/24/2019.
Does KELLY DIAZ, PHYSICIAN ASSISTANT prescribe more brand-name or generic drugs?
KELLY DIAZ, PHYSICIAN ASSISTANT's prescribing is 9% brand-name and 91% generic drugs by claim count, with $129K 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 KELLY DIAZ, PHYSICIAN ASSISTANT prescribe most often?
Based on 2023 Medicare Part D data, KELLY DIAZ, PHYSICIAN ASSISTANT's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does KELLY DIAZ, PHYSICIAN ASSISTANT accept Medicare?
KELLY DIAZ, PHYSICIAN ASSISTANT appears in CMS Medicare data with 1,849 Part D claims and 285 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify KELLY DIAZ, PHYSICIAN ASSISTANT's credentials?
KELLY DIAZ, PHYSICIAN ASSISTANT's NPI is 1568029437 with credentials PHYSICIAN ASSISTANT. 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