NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1326158791 D.O.
Verify on CMS → Andrew Nash, D.O.
Internal Medicine Physician in Harrington, Delaware.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,737 in Internal Medicine Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
13K
Medicare Part D claims · 1K beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
85%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$68.19
4 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Andrew Nash, D.O. filed 12,970 Medicare Part D claims in 2023 as a Internal Medicine Physician in Harrington, Delaware, prescribing 85% generic.
- 13K
- Part D claims, 2023
- 85%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Andrew Nash, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
12,970 Top 2% higher than 98% of 1,370,886 prescribers
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
✓
Board certification likely (heuristic, not verified)
Andrew Nash, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Andrew Nash, D.O.?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
12,970 378% vs specialty avg
Specialty distribution in Delaware
How Internal Medicine Physician compares to other specialties among Delaware providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Internal Medicine Physician. Verify directly:
How MIPS and board certification work
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).
Andrew Nash, D.O. appears in the CMS NPPES registry as an Internal Medicine Physician provider holding D.O. credentials at 16681 S DUPONT HWY, Harrington, DE, 19952, with a listed phone of (302) 398-8704. NPI 1326158791 was issued on 08/30/2006.
Medicare Part D records for calendar year 2023 show 12,970 prescription claims written by this provider, covering 1,172 Medicare beneficiaries and totaling roughly $1.7 million in drug spend, split 14% brand-name and 85% generic by claim count, with an opioid prescribing rate of 0.8%.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 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
Provider Details
| NPI | 1326158791 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 08/30/2006 |
Hospital and facility affiliations
Facilities where Andrew Nash, D.O. 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.
Bayhealth Medical Center, Inc
Harrington, DE
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Andrew Nash, D.O.. Source: openpaymentsdata.cms.gov.
Total received
$68
Largest payer
Novo Nordisk 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 · Typical
Andrew Nash, D.O. - brand share 14.0%
Internal Medicine Physician average
14% brand-name claims vs 85% generic, on 12,970 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.
12,970
Total Claims
$1.7M
Total Drug Cost
1,172
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 30,264
- Total Day Supply
- 885,782
- Brand vs Generic
- 14% brand / 85% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $266K
- Opioid Claims
- 108 (0.8% rate)
- Antibiotic Claims
- 300
Patient Demographics
- Average Patient Age
- 72.2 years
- Avg HCC Risk Score
- 1.49
- Gender Split
- 54% female / 46% male
- Age Distribution
- <65: 162, 65-74: 549, 75-84: 356, 85+: 105
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Andrew Nash, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
844 claims
- Warfarin Sodium
Warfarin Sodium
656 claims
- Amlodipine Besylate
Amlodipine Besylate
617 claims
- Rosuvastatin Calcium
Rosuvastatin Calcium
478 claims
- Lisinopril
Lisinopril
407 claims
- Metformin Hcl
Metformin Hcl
368 claims
- Levothyroxine Sodium 336
Levothyroxine Sodium
336 claims
- Omeprazole 327
Omeprazole
327 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 844 |
| Warfarin Sodium | 656 |
| Amlodipine Besylate | 617 |
| Rosuvastatin Calcium | 478 |
| Lisinopril | 407 |
| Metformin Hcl | 368 |
| Levothyroxine Sodium | 336 |
| Omeprazole | 327 |
| Losartan Potassium | 257 |
| Gabapentin | 240 |
* 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 Andrew Nash, D.O. fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Andrew Nash, D.O.'s 12,970 claims are above the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in Delaware
Other clinicians with the same primary specialty enrolled in Delaware, drawn from the same CMS NPPES roster as Nash.
Dr. Semaan Abboud
M.D.
Millsboro, DE
Dr. Joseph Raphael Ablaza
M.D.
Dover, DE
Anastasia Abongnelah
Milford, DE
Dr. Liann Abu Salman
MD
Newark, DE
Dr. Anas Abu-Khader
MD
Wilmington, DE
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Delaware medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal Medicine Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Andrew Nash, D.O.'s specialty? ▼
Andrew Nash, D.O. specializes in Internal Medicine Physician and practices in Harrington, Delaware. Credentials: D.O..
How much does Andrew Nash, D.O. prescribe under Medicare Part D? ▼
In 2023, Andrew Nash, D.O. wrote 12,970 Medicare Part D claims totaling $1.7M in drug costs for 1,172 beneficiaries.
Where is Andrew Nash, D.O. located? ▼
Andrew Nash, D.O. is located at 16681 S DUPONT HWY, Harrington, DE, 19952. Phone: (302) 398-8704.
What is Andrew Nash, D.O.'s NPI number? ▼
Andrew Nash, D.O.'s National Provider Identifier (NPI) is 1326158791, issued on 08/30/2006.
Does Andrew Nash, D.O. prescribe more brand-name or generic drugs? ▼
Andrew Nash, D.O.'s prescribing is 14% brand-name and 85% generic drugs by claim count, with $1.4M in brand drug costs.
Does Andrew Nash, D.O. prescribe opioids? ▼
Yes, Andrew Nash, D.O. had 108 opioid claims in 2023 with an opioid prescribing rate of 0.8%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 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 Andrew Nash, D.O. prescribe most often? ▼
Based on 2023 Medicare Part D data, Andrew Nash, D.O.'s most frequently prescribed drugs include Atorvastatin Calcium, Warfarin Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Andrew Nash, D.O. accept Medicare? ▼
Andrew Nash, D.O. appears in CMS Medicare data with 12,970 Part D claims and 1,172 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Andrew Nash, D.O.'s credentials? ▼
Andrew Nash, D.O.'s NPI is 1326158791 with credentials D.O.. 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
View source datasets and methodology notes
- 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
Compiled from official public sources by the PlainDoctor editorial team.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.