NPPES file of Aug 9, 2026

Julie Anne Winfield, M.D.

Specialist · Tiburon, CA

Julie Anne Winfield, M.D. is a specialist with a practice address in Tiburon, California, and NPI 1982733473, issued on Mar 2, 2007. Check the license (California A55830, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1982733473
Name
Julie Anne Winfield
Credential
M.D.
Primary taxonomy
Specialist 174400000X
License number
A55830 CA
Self-reported in NPPES; status is on the state search
Practice location
1652 Tiburon Blvd # 94920, Tiburon, CA 94920
Phone
(415) 250-1733
Enumerated
Mar 2, 2007
Record last updated
Mar 2, 2026
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest specialist records → All 5,749 in California → Look up another NPI →

Verify Julie Anne Winfield in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich California board licenses this profession
    Search for license A55830    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the California license search

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98% fewer Medicare Part D claims than the average specialist in 2024

21 Medicare Part D claims, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D.

  1. Julie Winfield21
  2. Specialty average1,380

Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.

Julie Anne Winfield among 5,749 specialist records in California

Julie Anne Winfield, M.D. is one of 5,749 specialist records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 40% of them.

  • NPI issued2007 · 40% of these records are older, 44% newer
  • In a Medicare fileYes · 30% of these records are
  • In the CMS Doctors and Clinicians fileNo · 19% of these records are
  • Record last updated2026 · 77% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Specialist providers in California

There are 5,749 specialist records in California.

All 5,749 in California → Every provider in Tiburon → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. Ilene Danse, M.D.Bolinas, CA 949241427483627
  2. Jennifer Duffy, PHDCorte Madera, CA 949251881716470
  3. Karen Nugent, P.T., C.H.T.Corte Madera, CA 949251679562649
  4. Patricia Scott, M.D.Corte Madera, CA 949251003835562
  5. Rhandee LippRohnert Park, CA 949281457849168
  6. David Orr, ATCRohnert Park, CA 949281891714432
  7. Bo Owens, ATC, CSCSRohnert Park, CA 949281144328550
  8. Abrea TillmanRohnert Park, CA 949281912798885

Common questions

What is Julie Anne Winfield, M.D.'s NPI number?

Julie Anne Winfield, M.D.'s National Provider Identifier (NPI) is 1982733473, issued on Mar 2, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Julie Anne Winfield, M.D. located?

The NPPES record lists a practice address at 1652 Tiburon Blvd # 94920, Tiburon, CA, 94920. Phone: (415) 250-1733. Providers update this record themselves, so call before visiting.

How can I verify Julie Anne Winfield, M.D.'s license?

NPPES lists California license number A55830, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Julie Anne Winfield, M.D. prescribe under Medicare Part D?

In 2024, Julie Anne Winfield, M.D. had 21 Medicare Part D claims; the average among specialist prescribers was 1,380. Part D covers Medicare prescriptions only.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.