2026 NPPES data Family Medicine Physician NPI 1841557345 MD
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SAMUEL DVORAK, MD

Family Medicine Physician in CARROLL, Iowa. 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 · 277 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs

What the federal data shows

SAMUEL DVORAK, MD filed 4,979 Medicare Part D claims in 2023 as a Family Medicine Physician in CARROLL, Iowa, prescribing 88% generic.

5K
Part D claims, 2023
88%
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.

SAMUEL DVORAK, MD's Medicare Part D volume vs every U.S. prescriber

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

4,979 Top 6% higher than 94% 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

Board certification likely (heuristic — not verified)

SAMUEL DVORAK, MD 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 SAMUEL DVORAK, MD?

Quality data not reported

NPI registry status

Active

Issued 04/20/2012

NPI 1841557345

Primary specialty

Family Medicine Physician

High-volume

147,640 US NPIs in this specialty

Medicare Part D claims

4,979 46% vs specialty avg

2023 prescription claims

Specialty avg: 3,418

Specialty distribution in Iowa

How Family Medicine Physician compares to other specialties among Iowa providers

Iowa providers

Family Medicine Physician share within Iowa

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

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).

SAMUEL DVORAK, MD appears in the CMS NPPES registry as a Family Medicine Physician provider holding MD credentials at 1214 SOUTH GRANT ROAD, CARROLL, IA, 51401, with a listed phone of (712) 792-1500. NPI 1841557345 was issued on 04/20/2012. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what DVORAK 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 4,979 prescription claims written by this provider, covering 277 Medicare beneficiaries and totaling roughly $400K in drug spend, split 12% brand-name and 88% generic by claim count, with an opioid prescribing rate of 2.4%. 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

1214 SOUTH GRANT ROAD
CARROLL, IA 51401

Provider Details

NPI 1841557345
Specialty Family Medicine Physician
Credentials MD
Gender Male
NPI Issued 04/20/2012

Hospital and facility affiliations

Facilities where SAMUEL DVORAK, 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.

MCFARLAND CLINIC PC
CARROLL, IA

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

SAMUEL DVORAK, MD — brand share 12.0%
Specialty average (est.)

12% brand-name claims vs 88% generic, on 4,979 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.

4,979
Total Claims
$400K
Total Drug Cost
277
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
9,669
Total Day Supply
273,692
Brand vs Generic
12% brand / 88% generic
Brand Drug Cost
$326K
Generic Drug Cost
$70K
Opioid Claims
118 (2.4% rate)
Antibiotic Claims
76

Patient Demographics

Average Patient Age
72.8 years
Avg HCC Risk Score
1.11
Gender Split
48% female / 52% male
Age Distribution
<65: 24, 65-74: 145, 75-84: 74, 85+: 34

Top Prescribed Drugs (Medicare Part D)

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

What SAMUEL DVORAK, MD 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
296
Levothyroxine Sodium
283
Amlodipine Besylate
243
Lisinopril
216
Losartan Potassium
148
Metoprolol Succinate
135
Omeprazole
131
Rosuvastatin Calcium
119
Furosemide
101
Hydrochlorothiazide
98

* 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 SAMUEL DVORAK, 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

SAMUEL DVORAK, MD's 4,979 claims are above the specialty average of 3,418.

Nearby Family Medicine Physician Providers in Iowa

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

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

Frequently Asked Questions

What is SAMUEL DVORAK, MD's specialty?
SAMUEL DVORAK, MD specializes in Family Medicine Physician and practices in CARROLL, Iowa. Credentials: MD.
How much does SAMUEL DVORAK, MD prescribe under Medicare Part D?
In 2023, SAMUEL DVORAK, MD wrote 4,979 Medicare Part D claims totaling $400K in drug costs for 277 beneficiaries.
Where is SAMUEL DVORAK, MD located?
SAMUEL DVORAK, MD is located at 1214 SOUTH GRANT ROAD, CARROLL, IA, 51401. Phone: (712) 792-1500.
What is SAMUEL DVORAK, MD's NPI number?
SAMUEL DVORAK, MD's National Provider Identifier (NPI) is 1841557345, issued on 04/20/2012.
Does SAMUEL DVORAK, MD prescribe more brand-name or generic drugs?
SAMUEL DVORAK, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $326K in brand drug costs.
Does SAMUEL DVORAK, MD prescribe opioids?
Yes, SAMUEL DVORAK, MD had 118 opioid claims in 2023 with an opioid prescribing rate of 2.4%.
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 SAMUEL DVORAK, MD prescribe most often?
Based on 2023 Medicare Part D data, SAMUEL DVORAK, MD's most frequently prescribed drugs include Atorvastatin Calcium, Levothyroxine Sodium, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does SAMUEL DVORAK, MD accept Medicare?
SAMUEL DVORAK, MD appears in CMS Medicare data with 4,979 Part D claims and 277 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify SAMUEL DVORAK, MD's credentials?
SAMUEL DVORAK, MD's NPI is 1841557345 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