NPI registry status
Active
2026 NPPES data Hematology (Internal Medicine) Physician NPI 1699736090 MD
Verify on CMS → John Sheehan, MD
Hematology (Internal Medicine) Physician in Madison, Wisconsin.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,436 in Hematology (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
166
Medicare Part D claims · 22 beneficiaries · Hematology (Internal Medicine) Physician avg: 693
Generic prescribing
66%
generic claims · 34% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$2.0K
1 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
John Sheehan, MD filed 166 Medicare Part D claims in 2023 as a Hematology (Internal Medicine) Physician in Madison, Wisconsin, prescribing 66% generic.
- 166
- Part D claims, 2023
- 66%
- 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.
John Sheehan, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
166 35th percentile higher than 35% 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)
John Sheehan, 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 John Sheehan, MD?
Quality data not reportedPrimary specialty
Hematology (Internal Medicine) Physician
Medicare Part D claims
166 76% vs specialty avg
Specialty distribution in Wisconsin
How Hematology (Internal Medicine) Physician compares to other specialties among Wisconsin 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 Hematology (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).
John Sheehan, MD appears in the CMS NPPES registry as a Hematology (Internal Medicine) Physician provider holding MD credentials at 600 HIGHLAND AVE, Madison, WI, 53792, with a listed phone of (608) 265-1700. NPI 1699736090 was issued on 03/28/2006.
Medicare Part D records for calendar year 2023 show 166 prescription claims written by this provider, covering 22 Medicare beneficiaries and totaling roughly $495K in drug spend, split 34% brand-name and 66% generic by claim count.
Hematology (Internal Medicine) Physician is a narrow specialty nationwide, with 1,436 enrolled providers across 50 states and an average of 693 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 | 1699736090 |
|---|---|
| Specialty | Hematology (Internal Medicine) Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 03/28/2006 |
Hospital and facility affiliations
Facilities where John Sheehan, 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.
University OF Wisconsin Medical Foundation Inc
Madison, WI
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 John Sheehan, MD. Source: openpaymentsdata.cms.gov.
Total received
$2.0K
Largest payer
PFIZER INC.
Most common payment type
Consulting Fee
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 · Above average
John Sheehan, MD - brand share 34.0%
Hematology (Internal Medicine) Physician average
34% brand-name claims vs 66% generic, on 166 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.
166
Total Claims
$495K
Total Drug Cost
22
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 235
- Total Day Supply
- 6,586
- Brand vs Generic
- 34% brand / 66% generic
- Brand Drug Cost
- $492K
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 76.1 years
- Avg HCC Risk Score
- 2.34
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What John Sheehan, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Acyclovir
Acyclovir
43 claims
- Hydroxyurea
Hydroxyurea
25 claims
- Imbruvica 13
Imbruvica
13 claims
- Epogen 12
Epogen
12 claims
- Xarelto 11
Xarelto
11 claims
| Drug | Claims |
|---|---|
| Acyclovir | 43 |
| Hydroxyurea | 25 |
| Imbruvica Ibrutinib | 13 |
| Epogen Epoetin Alfa | 12 |
| Xarelto Rivaroxaban | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Hematology (Internal Medicine) Physician in WI →
All providers in Wisconsin →
Compare specialties →
Hematology (Internal Medicine) Physician Overview
How John Sheehan, MD fits within the Hematology (Internal Medicine) Physician landscape nationally.
1,436
Hematology (Internal Medicine) Physician Providers in US
50
States with Hematology (Internal Medicine) Physician
693
Avg Claims per Provider
John Sheehan, MD's 166 claims are below the specialty average of 693.
Nearby Hematology (Internal Medicine) Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Sheehan.
Dr. David Blake
M.D.
New Berlin, WI
Dr. Wayne Bottner
MD
La Crosse, WI
Dr. Julie Chang
M.D.
Madison, WI
Dr. Michael Deininger
MD
Milwaukee, WI
Dr. Joshua Field
MD
Milwaukee, WI
Compare Hematology (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 Wisconsin medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Hematology (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 John Sheehan, MD's specialty? ▼
John Sheehan, MD specializes in Hematology (Internal Medicine) Physician and practices in Madison, Wisconsin. Credentials: MD.
How much does John Sheehan, MD prescribe under Medicare Part D? ▼
In 2023, John Sheehan, MD wrote 166 Medicare Part D claims totaling $495K in drug costs for 22 beneficiaries.
Where is John Sheehan, MD located? ▼
John Sheehan, MD is located at 600 HIGHLAND AVE, Madison, WI, 53792. Phone: (608) 265-1700.
What is John Sheehan, MD's NPI number? ▼
John Sheehan, MD's National Provider Identifier (NPI) is 1699736090, issued on 03/28/2006.
Does John Sheehan, MD prescribe more brand-name or generic drugs? ▼
John Sheehan, MD's prescribing is 34% brand-name and 66% generic drugs by claim count, with $492K in brand drug costs.
How many Hematology (Internal Medicine) Physician providers are there in the US? ▼
There are 1,436 Hematology (Internal Medicine) Physician providers across 50 states in the US. The average Hematology (Internal Medicine) Physician provider writes 693 Medicare Part D claims per year.
What drugs does John Sheehan, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, John Sheehan, MD's most frequently prescribed drugs include Acyclovir, Hydroxyurea, Imbruvica. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does John Sheehan, MD accept Medicare? ▼
John Sheehan, MD appears in CMS Medicare data with 166 Part D claims and 22 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify John Sheehan, MD's credentials? ▼
John Sheehan, MD's NPI is 1699736090 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
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.