2026 NPPES data Internal Medicine Physician NPI 1477563179 MD
Verify on CMS →

Charles Shepard, MD

Internal Medicine Physician in Winona, Minnesota. This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 172,858 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
5K
Medicare Part D claims · 233 beneficiaries · Internal Medicine Physician avg: 3K
Generic prescribing
88%
generic claims · 11% brand-name · higher generic rates reduce patient out-of-pocket costs
Compiled from official public sources by the PlainDoctor editorial team.

What the federal data shows

Charles Shepard, MD filed 5,258 Medicare Part D claims in 2023 as a Internal Medicine Physician in Winona, Minnesota, prescribing 88% generic.

5K
Part D claims, 2023
88%
generic prescribing

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.

Charles Shepard, MD's Medicare Part D volume vs every U.S. prescriber

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

5,258 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. 2K+: 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-eligible specialty (heuristic, not verified)

Charles Shepard, 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 Charles Shepard, MD?

Quality data not reported

NPI registry status

Active

Issued 08/08/2006

NPI 1477563179

Primary specialty

Internal Medicine Physician

High-volume

172,858 US NPIs in this specialty

Medicare Part D claims

5,258 94% vs specialty avg

2023 prescription claims

Specialty avg: 2,716

Specialty distribution in Minnesota

How Internal Medicine Physician compares to other specialties among Minnesota providers

Minnesota providers

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

Behavior Technician - 11.7%Behavior Technician11.7%Clinical Social Worker - 4.7%Clinical Social Worker4.7%Physical Therapist - 4.1%Physical Therapist4.1%Pharmacist - 3.7%Pharmacist3.7%Student in an Organized Health Care Education/Training Program - 3.4%Student in an Organized Health Care Education/Training Program3.4%Mental Health Counselor - 3.1%Mental Health Counselor3.1%Internal Medicine Physician - 2.6%Internal Medicine Physician2.6%
Largest specialties in Minnesota (% 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 Internal 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).

Charles Shepard, MD appears in the CMS NPPES registry as a Internal Medicine Physician provider holding MD credentials at 859 MANKATO AVE, Winona, MN, 55987, with a listed phone of (507) 454-3680. NPI 1477563179 was issued on 08/08/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what Shepard 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 5,258 prescription claims written by this provider, covering 233 Medicare beneficiaries and totaling roughly $445K in drug spend, split 11% brand-name and 88% generic by claim count, with an opioid prescribing rate of 2.1%. 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

859 MANKATO AVE
Winona, MN 55987

Provider Details

NPI 1477563179
Specialty Internal Medicine Physician
Credentials MD
Gender Male
NPI Issued 08/08/2006

Brand vs generic prescribing mix · Typical

Charles Shepard, MD - brand share 11.0%
Internal Medicine Physician average

11% brand-name claims vs 88% generic, on 5,258 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.

5,258
Total Claims
$445K
Total Drug Cost
233
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
11,658
Total Day Supply
342,879
Brand vs Generic
11% brand / 88% generic
Brand Drug Cost
$354K
Generic Drug Cost
$88K
Opioid Claims
109 (2.1% rate)
Antibiotic Claims
35

Patient Demographics

Average Patient Age
77.7 years
Avg HCC Risk Score
1.13
Gender Split
32% female / 68% male
Age Distribution
<65: 15, 65-74: 66, 75-84: 103, 85+: 49

Top Prescribed Drugs (Medicare Part D)

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

What Charles Shepard, 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
409
Amlodipine Besylate
251
Lisinopril
232
Metoprolol Succinate
217
Losartan Potassium
188
Hydrochlorothiazide
184
Levothyroxine Sodium
169
Omeprazole
169
Rosuvastatin Calcium
144
Warfarin Sodium
119

* 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 Charles Shepard, 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

Charles Shepard, MD's 5,258 claims are above the specialty average of 2,716.

Nearby Internal Medicine Physician Providers in Minnesota

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

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 Minnesota 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.

Frequently Asked Questions

What is Charles Shepard, MD's specialty?
Charles Shepard, MD specializes in Internal Medicine Physician and practices in Winona, Minnesota. Credentials: MD.
How much does Charles Shepard, MD prescribe under Medicare Part D?
In 2023, Charles Shepard, MD wrote 5,258 Medicare Part D claims totaling $445K in drug costs for 233 beneficiaries.
Where is Charles Shepard, MD located?
Charles Shepard, MD is located at 859 MANKATO AVE, Winona, MN, 55987. Phone: (507) 454-3680.
What is Charles Shepard, MD's NPI number?
Charles Shepard, MD's National Provider Identifier (NPI) is 1477563179, issued on 08/08/2006.
Does Charles Shepard, MD prescribe more brand-name or generic drugs?
Charles Shepard, MD's prescribing is 11% brand-name and 88% generic drugs by claim count, with $354K in brand drug costs.
Does Charles Shepard, MD prescribe opioids?
Yes, Charles Shepard, MD had 109 opioid claims in 2023 with an opioid prescribing rate of 2.1%.
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 Charles Shepard, MD prescribe most often?
Based on 2023 Medicare Part D data, Charles Shepard, MD's most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Lisinopril. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Charles Shepard, MD accept Medicare?
Charles Shepard, MD appears in CMS Medicare data with 5,258 Part D claims and 233 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Charles Shepard, MD's credentials?
Charles Shepard, MD's NPI is 1477563179 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.