2026 NPPES data Hospitalist Physician NPI 1083689434 M.D.
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WILLIAM MUNDELL, M.D.

Hospitalist Physician in ROCHESTER, Minnesota. 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
270
Medicare Part D claims · 15 beneficiaries · Hospitalist Physician avg: 888
Generic prescribing
82%
generic claims · 18% brand-name · higher generic rates reduce patient out-of-pocket costs
What the federal data reveals: WILLIAM MUNDELL, M.D. is a Hospitalist Physician ([object Object]) practicing in ROCHESTER, Minnesota with a Medicare Part D prescribing footprint of 270 claims across 15 beneficiaries — 18% brand-name prescribing .

What stands out: WILLIAM MUNDELL, M.D. filed 270 Medicare Part D claims in 2023 across ROCHESTER, Minnesota. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

WILLIAM MUNDELL, M.D. 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).

WILLIAM MUNDELL, M.D. at a glance

Quality data not reported

NPI registry status

Active

Issued 02/21/2006

NPI 1083689434

Primary specialty

Hospitalist Physician

Mid-sized

16,825 US NPIs in this specialty

Medicare Part D claims

270 70% vs specialty avg

2023 prescription claims

Specialty avg: 888

Specialty distribution in Minnesota

How Hospitalist Physician compares to other specialties among Minnesota providers

Minnesota providers

Hospitalist Physician share within Minnesota

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

Specialty board-certification context

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

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

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

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

WILLIAM MUNDELL, M.D. is a Hospitalist Physician provider practicing in ROCHESTER, Minnesota, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: M.D.. NPI: 1083689434. 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.

WILLIAM MUNDELL, M.D. appears in the CMS NPPES registry as a Hospitalist Physician provider holding M.D. credentials at 200 1ST ST SW, ROCHESTER, MN, 55905, with a listed phone of (507) 284-2511. NPI 1083689434 was issued on 02/21/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what MUNDELL 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 270 prescription claims written by this provider, covering 15 Medicare beneficiaries and totaling roughly $33K in drug spend, split 18% brand-name and 82% generic by claim count, with an opioid prescribing rate of 14.8%. 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.

Hospitalist Physician is a mid-sized specialty nationwide, with 16,825 enrolled providers across 54 states and an average of 888 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

200 1ST ST SW
ROCHESTER, MN 55905

Provider Details

NPI 1083689434
Specialty Hospitalist Physician
Credentials M.D.
Gender Male
NPI Issued 02/21/2006

Hospital and facility affiliations

Facilities where WILLIAM MUNDELL, M.D. 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.

MAYO CLINIC
ROCHESTER, MN

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

WILLIAM MUNDELL, M.D. — brand share 18.0%
Specialty average (est.)

18% brand-name claims vs 82% generic, on 270 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.

270
Total Claims
$33K
Total Drug Cost
15
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
335
Total Day Supply
7,498
Brand vs Generic
18% brand / 82% generic
Brand Drug Cost
$28K
Generic Drug Cost
$5K
Opioid Claims
40 (14.8% rate)

Patient Demographics

Average Patient Age
79.3 years
Avg HCC Risk Score
3.56
Age Distribution
<65: 0, 65-74: N/A, 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
Diazepam
20
Oxycodone Hcl
20
Atorvastatin Calcium
18
Oxycontin
Oxycodone Hcl
17
Hydrochlorothiazide
13

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

Hospitalist Physician Overview

How WILLIAM MUNDELL, M.D. fits within the Hospitalist Physician landscape nationally.

16,825
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
888
Avg Claims per Provider

WILLIAM MUNDELL, M.D.'s 270 claims are below the specialty average of 888.

Nearby Hospitalist Physician Providers in Minnesota

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

Compare Hospitalist Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is WILLIAM MUNDELL, M.D.'s specialty?
WILLIAM MUNDELL, M.D. specializes in Hospitalist Physician and practices in ROCHESTER, Minnesota. Credentials: M.D..
How much does WILLIAM MUNDELL, M.D. prescribe under Medicare Part D?
In 2023, WILLIAM MUNDELL, M.D. wrote 270 Medicare Part D claims totaling $33K in drug costs for 15 beneficiaries.
Where is WILLIAM MUNDELL, M.D. located?
WILLIAM MUNDELL, M.D. is located at 200 1ST ST SW, ROCHESTER, MN, 55905. Phone: (507) 284-2511.
What is WILLIAM MUNDELL, M.D.'s NPI number?
WILLIAM MUNDELL, M.D.'s National Provider Identifier (NPI) is 1083689434, issued on 02/21/2006.
Does WILLIAM MUNDELL, M.D. prescribe more brand-name or generic drugs?
WILLIAM MUNDELL, M.D.'s prescribing is 18% brand-name and 82% generic drugs by claim count, with $28K in brand drug costs.
Does WILLIAM MUNDELL, M.D. prescribe opioids?
Yes, WILLIAM MUNDELL, M.D. had 40 opioid claims in 2023 with an opioid prescribing rate of 14.8%.
How many Hospitalist Physician providers are there in the US?
There are 16,825 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 888 Medicare Part D claims per year.
What drugs does WILLIAM MUNDELL, M.D. prescribe most often?
Based on 2023 Medicare Part D data, WILLIAM MUNDELL, M.D.'s most frequently prescribed drugs include Diazepam, Oxycodone Hcl, Atorvastatin Calcium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does WILLIAM MUNDELL, M.D. accept Medicare?
WILLIAM MUNDELL, M.D. appears in CMS Medicare data with 270 Part D claims and 15 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify WILLIAM MUNDELL, M.D.'s credentials?
WILLIAM MUNDELL, M.D.'s NPI is 1083689434 with credentials M.D.. 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