NPPES file of Aug 9, 2026

Michael Mainardi, M.D.

Specialist · Sonoma, CA

Michael Mainardi, M.D. is a specialist with a practice address in Sonoma, California, and NPI 1801815360, issued on Jul 18, 2006. Check the license (California G19146, 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
1801815360
Name
Michael Mainardi
Credential
M.D.
Primary taxonomy
Specialist 174400000X
License number
G19146 CA
Self-reported in NPPES; status is on the state search
Practice location
2877 White Alder, Sonoma, CA 95476
Phone
(707) 938-9331
Enumerated
Jul 18, 2006
Record last updated
Jan 12, 2015 (not updated in 11 years: call before relying on the address or phone)
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 Michael Mainardi 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 G19146    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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99% fewer Medicare Part D claims than the average specialist in 2024

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

  1. Michael Mainardi14
  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.

Michael Mainardi among 5,749 specialist records in California

Michael Mainardi, 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 updated2015 · 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 Sonoma → Specialist nationwide →

The 8 specialist records with the nearest ZIP codes

  1. Alicia HuntSonoma, CA 954761821979394
  2. Thomas Cunningham, M.D.Sebastopol, CA 954721821034125
  3. Allan Hill, MDSebastopol, CA 954721578565438
  4. Margaret Bracewell, OTR/LUkiah, CA 954821497920490
  5. Joseph Kimbro, MDUkiah, CA 954821134290380
  6. William Bowen, M.D.Willits, CA 954901770593386
  7. Laisenia SauWillits, CA 954901679194971
  8. Daisy Bravo LagunasWindsor, CA 954921962320655

Common questions

What is Michael Mainardi, M.D.'s NPI number?

Michael Mainardi, M.D.'s National Provider Identifier (NPI) is 1801815360, issued on Jul 18, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Michael Mainardi, M.D. located?

The NPPES record lists a practice address at 2877 White Alder, Sonoma, CA, 95476. Phone: (707) 938-9331. Providers update this record themselves, so call before visiting.

How can I verify Michael Mainardi, M.D.'s license?

NPPES lists California license number G19146, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.

How much does Michael Mainardi, M.D. prescribe under Medicare Part D?

In 2024, Michael Mainardi, M.D. had 14 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.