NPPES file of Aug 9, 2026

Gregory James Leipzig, M.D.

Anesthesiology Physician · Napa, CA

Gregory James Leipzig, M.D. is an anesthesiology physician with a practice address in Napa, California, and NPI 1750452033, issued on Nov 10, 2006. Check the license (California G821121, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.

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

NPPES recordNPPES file of Aug 9, 2026
1750452033
Name
Gregory James Leipzig
Credential
M.D.
Primary taxonomy
Anesthesiology Physician 207L00000X
License number
G821121 CA
Self-reported in NPPES; status is on the state search
Practice location
1000 Trancas St, Napa, CA 94558
Phone
(707) 252-4411
Enumerated
Nov 10, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicaid ID
00G821120 CA
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 anesthesiology physician records → All 7,571 in California → Look up another NPI →

Also registered at 1000 Trancas St

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

  1. Deborah Albert, PH.D, BSN, IBCLCLactation Consultant (Registered Nurse)1508115247
  2. Christian Anderson, M.D.Radiation Oncology Physician1235160730
  3. Melvin Atchison, CRNACertified Registered Nurse Anesthetist1750331344
  4. Ernesto Avelar, PHARM DCritical Care Pharmacist1265365787
  5. Mark Borsody, MDNeurology Physician1215179767
  6. Maureen Bose, BSN, RN, IBCLCLactation Consultant (Registered Nurse)1780375733

Verify Gregory James Leipzig in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G821121    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
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Gregory James Leipzig among 7,571 anesthesiology physician records in California

Gregory James Leipzig, M.D. is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.

  • NPI issued2006 · 5% of these records are older, 53% newer
  • In a Medicare fileNo · 71% of these records are
  • In the CMS Doctors and Clinicians fileNo · 64% of these records are
  • Record last updated2007 · 63% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Anesthesiology Physician providers in California

There are 7,571 anesthesiology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,571 in California → Every provider in Napa → Anesthesiology Physician nationwide →

The 8 anesthesiology physician records with the nearest ZIP codes

  1. Jerry Abajian, M.D.Napa, CA 945581851336218
  2. Jonathan Cohen, M.D.Napa, CA 945581396819959
  3. Patricia Decker, M.D.Napa, CA 945581114993540
  4. Daniel Masluk, M.D.Napa, CA 945581619906708
  5. Robert Morris, M.D.Napa, CA 945581245301548
  6. Robert Singler, M.D.Napa, CA 945581629181318
  7. Nicolas Wozmak, M.D.Napa, CA 945581467619353
  8. Robert Zellmer, M.D.Napa, CA 945581306850318

Common questions

What is Gregory James Leipzig, M.D.'s NPI number?

Gregory James Leipzig, M.D.'s National Provider Identifier (NPI) is 1750452033, issued on Nov 10, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Gregory James Leipzig, M.D. located?

The NPPES record lists a practice address at 1000 Trancas St, Napa, CA, 94558. Phone: (707) 252-4411. Providers update this record themselves, so call before visiting.

How can I verify Gregory James Leipzig, M.D.'s license?

NPPES lists California license number G821121, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.