2026 NPPES data Clinical Pathology/Laboratory Medicine Physician NPI 1558345124 MD
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Roger Gunn, MD

Clinical Pathology/Laboratory Medicine Physician in Sioux City, Iowa. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,229 in Clinical Pathology/Laboratory 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
22
Medicare Part D claims · Clinical Pathology/Laboratory Medicine Physician avg: 149
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Roger Gunn, MD filed 22 Medicare Part D claims in 2023 as a Clinical Pathology/Laboratory Medicine Physician in Sioux City, Iowa.

22
Part D claims, 2023

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.

Roger Gunn, MD's Medicare Part D volume vs every U.S. prescriber

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

22 0th percentile higher than 0% of 1,370,886 prescribers

0–200: 670,926 prescribers (49%). This entry sits in this band. 200–400: 182,923 prescribers (13%). Above this entry. 400–600: 90,619 prescribers (7%). Above this entry. 600–800: 56,224 prescribers (4%). Above this entry. 800–1,000: 40,919 prescribers (3%). Above this entry. 1,000–1,200: 31,827 prescribers (2%). Above this entry. 1,200–1,400: 26,224 prescribers (2%). Above this entry. 1,400–1,600: 21,710 prescribers (2%). Above this entry. 1,600–1,800: 19,072 prescribers (1%). Above this entry. 1,800–2,000: 16,451 prescribers (1%). Above this entry. 2K+: 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

Board-eligible specialty (heuristic, not verified)

Roger Gunn, 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).

What does the federal data show about Roger Gunn, MD?

Quality data not reported

NPI registry status

Active

Issued 12/06/2005

NPI 1558345124

Primary specialty

Clinical Pathology/Laboratory Medicine Physician

Niche

1,229 US NPIs in this specialty

Medicare Part D claims

22 85% vs specialty avg

2023 prescription claims

Specialty avg: 149

Specialty distribution in Iowa

How Clinical Pathology/Laboratory Medicine Physician compares to other specialties among Iowa providers

Iowa providers

Largest specialties in Iowa (% of in-state providers)

Pharmacist - 6.6%Pharmacist6.6%Physical Therapist - 5.5%Physical Therapist5.5%Mental Health Counselor - 5%Mental Health Counselor5%Family Medicine Physician - 4.8%Family Medicine Physician4.8%Chiropractor - 4.2%Chiropractor4.2%Clinical Social Worker - 4.1%Clinical Social Worker4.1%Clinical Pathology/Laboratory Medicine Physician - 0%Clinical Pathology/Laboratory Medicine Physician0%
Largest specialties in Iowa (% of in-state 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 Clinical Pathology/Laboratory Medicine Physician. Verify directly:

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).

Roger Gunn, MD appears in the CMS NPPES registry as a Clinical Pathology/Laboratory Medicine Physician provider holding MD credentials at 801 5TH ST, Sioux City, IA, 51101, with a listed phone of (712) 279-2372. NPI 1558345124 was issued on 12/06/2005. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Gunn 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 22 prescription claims written by this provider, covering N/A Medicare beneficiaries and totaling roughly $354 in drug spend. 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.

Clinical Pathology/Laboratory Medicine Physician is a narrow specialty nationwide, with 1,229 enrolled providers across 51 states and an average of 149 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

801 5TH ST
Sioux City, IA 51101

Provider Details

NPI 1558345124
Specialty Clinical Pathology/Laboratory Medicine Physician
Credentials MD
Gender Male
NPI Issued 12/06/2005

Medicare Part D Prescribing Data

CMS Medicare Part D prescriber-level data for calendar year 2023.

22
Total Claims
$354
Total Drug Cost
N/A
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
30
Total Day Supply
688
Brand Drug Cost
$0
Generic Drug Cost
$354

Patient Demographics

Average Patient Age
76.0 years
Avg HCC Risk Score
0.36

Clinical Pathology/Laboratory Medicine Physician Overview

How Roger Gunn, MD fits within the Clinical Pathology/Laboratory Medicine Physician landscape nationally.

1,229
Clinical Pathology/Laboratory Medicine Physician Providers in US
51
States with Clinical Pathology/Laboratory Medicine Physician
149
Avg Claims per Provider

Roger Gunn, MD's 22 claims are below the specialty average of 149.

Nearby Clinical Pathology/Laboratory Medicine Physician Providers in Iowa

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

Compare Clinical Pathology/Laboratory 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 Iowa medical board, federal registration is not a license check. Credential verification guide
  • Weigh a second option: compare this provider with a nearby Clinical Pathology/Laboratory 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.

Frequently Asked Questions

What is Roger Gunn, MD's specialty?
Roger Gunn, MD specializes in Clinical Pathology/Laboratory Medicine Physician and practices in Sioux City, Iowa. Credentials: MD.
How much does Roger Gunn, MD prescribe under Medicare Part D?
In 2023, Roger Gunn, MD wrote 22 Medicare Part D claims totaling $354 in drug costs for N/A beneficiaries.
Where is Roger Gunn, MD located?
Roger Gunn, MD is located at 801 5TH ST, Sioux City, IA, 51101. Phone: (712) 279-2372.
What is Roger Gunn, MD's NPI number?
Roger Gunn, MD's National Provider Identifier (NPI) is 1558345124, issued on 12/06/2005.
How many Clinical Pathology/Laboratory Medicine Physician providers are there in the US?
There are 1,229 Clinical Pathology/Laboratory Medicine Physician providers across 51 states in the US. The average Clinical Pathology/Laboratory Medicine Physician provider writes 149 Medicare Part D claims per year.
Does Roger Gunn, MD accept Medicare?
Roger Gunn, MD appears in CMS Medicare data with 22 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Roger Gunn, MD's credentials?
Roger Gunn, MD's NPI is 1558345124 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

Compiled from official public sources by the PlainDoctor editorial team.