2026 NPPES data Internal Medicine Physician NPI 1598783631 MD
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CORY MILLER, MD

Internal Medicine Physician in WILLISTON, North Dakota. 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
4K
Medicare Part D claims · 212 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
86%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: CORY MILLER, MD is a Internal Medicine Physician ([object Object]) practicing in WILLISTON, North Dakota with a Medicare Part D prescribing footprint of 4K claims across 212 beneficiaries — 14% brand-name prescribing .

What stands out: CORY MILLER, MD filed 3,594 Medicare Part D claims in 2023 across WILLISTON, North Dakota. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board-eligible specialty (heuristic — not verified)

CORY MILLER, MD practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).

CORY MILLER, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 07/17/2006

NPI 1598783631

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

3,594 32% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in North Dakota

How Internal Medicine Physician compares to other specialties among North Dakota providers

North Dakota providers

Internal Medicine Physician share within North Dakota

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

Specialty board-certification context

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

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

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

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

CORY MILLER, MD is a Internal Medicine Physician provider practicing in WILLISTON, North Dakota, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1598783631. 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.

CORY MILLER, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 1213 15TH AVE W, WILLISTON, ND, 58801, with a listed phone of (701) 572-7651. NPI 1598783631 was issued on 07/17/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MILLER 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 3,594 prescription claims written by this provider, covering 212 Medicare beneficiaries and totaling roughly $411K in drug spend, split 14% brand-name and 86% 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.

Internal Medicine Physician is a high-volume specialty nationwide, with 172,858 enrolled providers across 56 states and an average of 2,716 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

1213 15TH AVE W
WILLISTON, ND 58801

Provider Details

NPI 1598783631
Specialty Internal Medicine Physician
Credentials MD
Gender Male
NPI Issued 07/17/2006

Brand vs generic prescribing mix · Typical

CORY MILLER, MD — brand share 14.0%
Specialty average (est.)

14% brand-name claims vs 86% generic, on 3,594 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.

3,594
Total Claims
$411K
Total Drug Cost
212
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
7,852
Total Day Supply
231,200
Brand vs Generic
14% brand / 86% generic
Brand Drug Cost
$341K
Generic Drug Cost
$69K
Antibiotic Claims
57

Patient Demographics

Average Patient Age
75.8 years
Avg HCC Risk Score
0.93
Gender Split
34% female / 66% male

Top Prescribed Drugs (Medicare Part D)

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

Drug Claims
Lisinopril
236
Rosuvastatin Calcium
214
Amlodipine Besylate
158
Losartan Potassium
141
Metoprolol Succinate
134
Atorvastatin Calcium
130
Metformin Hcl Er
Metformin Hcl
124
Tamsulosin Hcl
103
Levothyroxine Sodium
98
Allopurinol
87

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

Internal Medicine Physician Overview

How CORY MILLER, MD fits within the Internal Medicine Physician landscape nationally.

172,858
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider

CORY MILLER, MD's 3,594 claims are above the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in North Dakota

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

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

Frequently Asked Questions

What is CORY MILLER, MD's specialty?
CORY MILLER, MD specializes in Internal Medicine Physician and practices in WILLISTON, North Dakota. Credentials: MD.
How much does CORY MILLER, MD prescribe under Medicare Part D?
In 2023, CORY MILLER, MD wrote 3,594 Medicare Part D claims totaling $411K in drug costs for 212 beneficiaries.
Where is CORY MILLER, MD located?
CORY MILLER, MD is located at 1213 15TH AVE W, WILLISTON, ND, 58801. Phone: (701) 572-7651.
What is CORY MILLER, MD's NPI number?
CORY MILLER, MD's National Provider Identifier (NPI) is 1598783631, issued on 07/17/2006.
Does CORY MILLER, MD prescribe more brand-name or generic drugs?
CORY MILLER, MD's prescribing is 14% brand-name and 86% generic drugs by claim count, with $341K in brand drug costs.
How many Internal Medicine Physician providers are there in the US?
There are 172,858 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does CORY MILLER, MD prescribe most often?
Based on 2023 Medicare Part D data, CORY MILLER, MD's most frequently prescribed drugs include Lisinopril, Rosuvastatin Calcium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does CORY MILLER, MD accept Medicare?
CORY MILLER, MD appears in CMS Medicare data with 3,594 Part D claims and 212 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify CORY MILLER, MD's credentials?
CORY MILLER, MD's NPI is 1598783631 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