NPI registry status
Active
2026 NPPES data Blood Banking & Transfusion Medicine Physician NPI 1003301318 MD
Verify on CMS → Timothy Greenwell, MD
Blood Banking & Transfusion Medicine Physician in Milwaukee, 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 566 in Blood Banking & Transfusion 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.
What the federal data shows
Timothy Greenwell, MD is a Blood Banking & Transfusion Medicine Physician in Milwaukee, Wisconsin, listed in the federal CMS National Provider Identifier registry.
- Likely
- board-certified (heuristic)
- #231
- Blood Banking & Transfusion Medicine Physician rank among Wisconsin specialties
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.
CMS NPPES provider registry desk
NPI 1003301318 · Blood Banking & Transfusion Medicine Physician
NPI-10 · ENUM-RECENT · TAX-NARROW · RX-NONE · BOOK-THIN · PHOTO-ENUM
- NPI-10 1003301318
- ENUM-RECENT 2018
- TAX-NARROW 566
- RX-NONE No Part D
- BOOK-THIN 17 in Wisconsin
- PHOTO-ENUM Lisa Huynh · 2018
✓
Board certification likely (heuristic, not verified)
Timothy Greenwell, 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 Timothy Greenwell, MD?
Quality data not reportedPrimary specialty
Blood Banking & Transfusion Medicine Physician
Specialty distribution in Wisconsin
How Blood Banking & Transfusion 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 Blood Banking & Transfusion 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).
Practice Address
Provider Details
| NPI | 1003301318 |
|---|---|
| Specialty | Blood Banking & Transfusion Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/28/2018 |
Hospital and facility affiliations
Facilities where Timothy Greenwell, 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.
Great Lakes Pathologists SC
West Allis, 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).
More Blood Banking & Transfusion Medicine Physician in WI →
All providers in Wisconsin →
Compare specialties →
Blood Banking & Transfusion Medicine Physician Overview
How Timothy Greenwell, MD fits within the Blood Banking & Transfusion Medicine Physician landscape nationally.
566
Blood Banking & Transfusion Medicine Physician Providers in US
46
States with Blood Banking & Transfusion Medicine Physician
222
Avg Claims per Provider
Nationwide Blood Banking & Transfusion Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Greenwell, both outside Wisconsin so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2018)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Blood Banking & Transfusion Medicine Physician Providers in Wisconsin
Other clinicians with the same primary specialty enrolled in Wisconsin, drawn from the same CMS NPPES roster as Greenwell.
One of 17 Blood Banking & Transfusion Medicine Physician providers enrolled in Wisconsin, 5 are shown here.
Dr. Waseem Anani
M.D.
Milwaukee, WI
Dr. Barbara Bryant
MD
Milwaukee, WI
Dr. Joseph Connor
MD
Madison, WI
Dr. Jerome Gottschall
MD
Milwaukee, WI
Dr. Thomas Hadley
MD
Eau Claire, WI
Compare Blood Banking & Transfusion Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Timothy Greenwell, MD's specialty? ▼
Timothy Greenwell, MD specializes in Blood Banking & Transfusion Medicine Physician and practices in Milwaukee, Wisconsin. Credentials: MD.
Where is Timothy Greenwell, MD located? ▼
Timothy Greenwell, MD is located at 9200 W WISCONSIN AVE, Milwaukee, WI, 53226. Phone: (414) 805-3666.
What is Timothy Greenwell, MD's NPI number? ▼
Timothy Greenwell, MD's National Provider Identifier (NPI) is 1003301318, issued on 06/28/2018.
How many Blood Banking & Transfusion Medicine Physician providers are there in the US? ▼
There are 566 Blood Banking & Transfusion Medicine Physician providers across 46 states in the US. The average Blood Banking & Transfusion Medicine Physician provider writes 222 Medicare Part D claims per year.
Does Timothy Greenwell, MD accept Medicare? ▼
Timothy Greenwell, MD appears in CMS Medicare data. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy Greenwell, MD's credentials? ▼
Timothy Greenwell, MD's NPI is 1003301318 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.
- 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
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of May 2026.