2026 NPPES data Family Medicine Physician NPI 1326629858 MD
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STEPHEN ALLDAY, MD

Family Medicine Physician in GREENVILLE, North Carolina. 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 · 186 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: STEPHEN ALLDAY, MD is a Family Medicine Physician ([object Object]) practicing in GREENVILLE, North Carolina with a Medicare Part D prescribing footprint of 1K claims across 186 beneficiaries — 19% brand-name prescribing .

What stands out: STEPHEN ALLDAY, MD filed 1,446 Medicare Part D claims in 2023 across GREENVILLE, North Carolina. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

STEPHEN ALLDAY, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

STEPHEN ALLDAY, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 04/16/2021

NPI 1326629858

Primary specialty

Family Medicine Physician

High-volume

147,640 US NPIs in this specialty

Medicare Part D claims

1,446 58% vs specialty avg

2023 prescription claims

Specialty avg: 3,418

Specialty distribution in North Carolina

How Family Medicine Physician compares to other specialties among North Carolina providers

North Carolina providers

Family Medicine Physician share within North Carolina

1. Family Medicine Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Family Medicine Physician share within North Carolina

Specialty board-certification context

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

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

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

0%100%78%
Est. board-certified rate (Family Medicine Physician) — 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).

STEPHEN ALLDAY, MD is a Family Medicine Physician provider practicing in GREENVILLE, North Carolina, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1326629858. 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.

STEPHEN ALLDAY, MD appears in the CMS NPPES registry as a Family Medicine Physician provider holding MD credentials at 1850 W ARLINGTON BLVD, GREENVILLE, NC, 27834, with a listed phone of (252) 413-6202. NPI 1326629858 was issued on 04/16/2021. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ALLDAY 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 1,446 prescription claims written by this provider, covering 186 Medicare beneficiaries and totaling roughly $176K in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 1.1%. 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.

Family Medicine Physician is a high-volume specialty nationwide, with 147,640 enrolled providers across 56 states and an average of 3,418 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

1850 W ARLINGTON BLVD
GREENVILLE, NC 27834

Provider Details

NPI 1326629858
Specialty Family Medicine Physician
Credentials MD
Gender Male
NPI Issued 04/16/2021

Hospital and facility affiliations

Facilities where STEPHEN ALLDAY, MD 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.

PHYSICIANS EAST PA
GREENVILLE, NC
PROACTIVE THERAPY OF NORTH CAROLINA INC
WILSON, NC

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 · Typical

STEPHEN ALLDAY, MD — brand share 19.0%
Specialty average (est.)

19% brand-name claims vs 81% generic, on 1,446 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.

1,446
Total Claims
$176K
Total Drug Cost
186
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
2,928
Total Day Supply
84,616
Brand vs Generic
19% brand / 81% generic
Brand Drug Cost
$156K
Generic Drug Cost
$19K
Opioid Claims
16 (1.1% rate)
Antibiotic Claims
28

Patient Demographics

Average Patient Age
66.7 years
Avg HCC Risk Score
1.94
Gender Split
60% female / 40% male
Age Distribution
<65: 59, 65-74: 79, 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.

Drug Claims
Amlodipine Besylate
131
Atorvastatin Calcium
88
Lisinopril
51
Levothyroxine Sodium
35
Pantoprazole Sodium
35
Albuterol Sulfate Hfa
Albuterol Sulfate
34
Hydrochlorothiazide
33
Sertraline Hcl
33
Jardiance
Empagliflozin
31
Metformin Hcl Er
Metformin Hcl
31

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

Family Medicine Physician Overview

How STEPHEN ALLDAY, MD fits within the Family Medicine Physician landscape nationally.

147,640
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider

STEPHEN ALLDAY, MD's 1,446 claims are below the specialty average of 3,418.

Nearby Family Medicine Physician Providers in North Carolina

Other clinicians with the same primary specialty enrolled in North Carolina, drawn from the same CMS NPPES roster as ALLDAY.

Compare Family Medicine Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is STEPHEN ALLDAY, MD's specialty?
STEPHEN ALLDAY, MD specializes in Family Medicine Physician and practices in GREENVILLE, North Carolina. Credentials: MD.
How much does STEPHEN ALLDAY, MD prescribe under Medicare Part D?
In 2023, STEPHEN ALLDAY, MD wrote 1,446 Medicare Part D claims totaling $176K in drug costs for 186 beneficiaries.
Where is STEPHEN ALLDAY, MD located?
STEPHEN ALLDAY, MD is located at 1850 W ARLINGTON BLVD, GREENVILLE, NC, 27834. Phone: (252) 413-6202.
What is STEPHEN ALLDAY, MD's NPI number?
STEPHEN ALLDAY, MD's National Provider Identifier (NPI) is 1326629858, issued on 04/16/2021.
Does STEPHEN ALLDAY, MD prescribe more brand-name or generic drugs?
STEPHEN ALLDAY, MD's prescribing is 19% brand-name and 81% generic drugs by claim count, with $156K in brand drug costs.
Does STEPHEN ALLDAY, MD prescribe opioids?
Yes, STEPHEN ALLDAY, MD had 16 opioid claims in 2023 with an opioid prescribing rate of 1.1%.
How many Family Medicine Physician providers are there in the US?
There are 147,640 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does STEPHEN ALLDAY, MD prescribe most often?
Based on 2023 Medicare Part D data, STEPHEN ALLDAY, MD's most frequently prescribed drugs include Amlodipine Besylate, Atorvastatin Calcium, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does STEPHEN ALLDAY, MD accept Medicare?
STEPHEN ALLDAY, MD appears in CMS Medicare data with 1,446 Part D claims and 186 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify STEPHEN ALLDAY, MD's credentials?
STEPHEN ALLDAY, MD's NPI is 1326629858 with credentials MD. 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