NPPES file of Aug 9, 2026

John Paul Zimmermann, M.D.

Specialist · Napa, CA

John Paul Zimmermann, M.D. is a specialist with a practice address in Napa, California, and NPI 1558380154, issued on Jul 18, 2006. Check the license (California G-26664, 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
1558380154
Name
John Paul Zimmermann
Credential
M.D.
Primary taxonomy
Specialist 174400000X
License number
G-26664 CA
Self-reported in NPPES; status is on the state search
Practice location
3443 Villa LN Ste 10, Napa, CA 94558
Phone
(707) 258-6077
Enumerated
Jul 18, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(707) 253-7182
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 →

Also registered at 3443 Villa LN Ste 10

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Robert Davis, MDSpecialist1255440228
  2. Diana Devera, D.O.Internal Medicine Physician1629399563
  3. Paul Laband, MDInternal Medicine Physician1427029040

Verify John Paul Zimmermann 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 G-26664    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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90% fewer Medicare Part D claims than the average specialist in 2024

140 Medicare Part D claims for 20 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 15 claims were for opioids.

  1. John Zimmermann140
  2. Specialty average1,380

Most prescribed

  1. Oxycodone-Acetaminophen15 claims
  2. Cephalexin13 claims
  3. Zolpidem Tartrate Er12 claims

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.

John Paul Zimmermann among 5,749 specialist records in California

John Paul Zimmermann, 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 2006, is newer than 7% of them.

  • NPI issued2006 · 7% of these records are older, 60% newer
  • In a Medicare fileYes · 30% of these records are
  • In the CMS Doctors and Clinicians fileNo · 19% of these records are
  • Record last updated2007 · 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 Napa → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. James Bird, M.D.Napa, CA 945581629067210
  2. Robert Davis, MDNapa, CA 945581255440228
  3. George Lendaris, R.P.T.Napa, CA 945581639266133
  4. Robert Losey, M.D.Napa, CA 945581669496543
  5. Elizabeth Moffitt, M.D.Napa, CA 945581497779383
  6. George Monteverdi, M.D.Napa, CA 945581730362062
  7. Wyeth Pierce, D.P.T.Napa, CA 945581659448702
  8. Lisa ToftelyNapa, CA 945581346687688

Common questions

What is John Paul Zimmermann, M.D.'s NPI number?

John Paul Zimmermann, M.D.'s National Provider Identifier (NPI) is 1558380154, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.

Where is John Paul Zimmermann, M.D. located?

The NPPES record lists a practice address at 3443 Villa LN Ste 10, Napa, CA, 94558. Phone: (707) 258-6077. Providers update this record themselves, so call before visiting.

How can I verify John Paul Zimmermann, M.D.'s license?

NPPES lists California license number G-26664, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does John Paul Zimmermann, M.D. prescribe under Medicare Part D?

In 2024, John Paul Zimmermann, M.D. had 140 Medicare Part D claims for 20 beneficiaries; 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.