Neil Michael Barth, M.D.

Hematology & Oncology Physician · Newport Beach, CA

Neil Michael Barth, M.D. is a hematology & oncology physician with a practice address in Newport Beach, California, and NPI 1245379858, issued on Feb 6, 2007. Check the license (California G37824, 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

1245379858

Name: Neil Michael Barth
Credential: M.D.
Primary taxonomy: Hematology & Oncology Physician 207RH0003X
License number: G37824 CA
Self-reported in NPPES; status is on the state search
Practice location: 20162 SW Birch St, Newport Beach, CA 92660
Phone: (949) 553-3330
Enumerated: Feb 6, 2007
Record last updated: Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax: (949) 631-9012
Medicaid ID: GR0041390 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 hematology & oncology physician records → All 1,583 in California → Look up another NPI →

Also registered at 20162 SW Birch St

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

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Verify Neil Michael Barth in five checks

1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
2LicenseActive license and public ordersMedical Board of California
Search for license G37824Check the board
3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
5CertificationBoard certificationABMS AOA NCCPA AANPNot checked

Open the California license search

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Neil Michael Barth among 1,583 hematology & oncology physician records in California

Neil Michael Barth, M.D. is one of 1,583 hematology & oncology physician records with a practice address in California. 83% 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 2007, is newer than 46% of them.

NPI issued2007 · 46% of these records are older, 40% newer
In a Medicare fileNo · 83% of these records are
In the CMS Doctors and Clinicians fileNo · 71% of these records are
Record last updated2007 · 58% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hematology & Oncology Physician providers in California

There are 1,583 hematology & oncology physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 1,583 in California → Every provider in Newport Beach → Hematology & Oncology Physician nationwide →

The 8 hematology & oncology physician records with the nearest ZIP codes

Robert Carroll, M.D.Newport Beach, CA 926601295875854
Wael Harb, MDNewport Beach, CA 926601861468415
Misagh Karimi, MDNewport Beach, CA 926601770583197
Darwin Roman, M.D.Newport Beach, CA 926601821478082
Irina Sachelarie, M.D.Newport Beach, CA 926601730139387
George Semeniuk, M.D.Newport Beach, CA 926601316022924
Wade Smith, M.D.Newport Beach, CA 926601730240219
Tingting Tan, M.D. PH.D.Newport Beach, CA 926601669627238

Common questions

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

Neil Michael Barth, M.D.'s National Provider Identifier (NPI) is 1245379858, issued on Feb 6, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Neil Michael Barth, M.D. located?

The NPPES record lists a practice address at 20162 SW Birch St, Newport Beach, CA, 92660. Phone: (949) 553-3330. Providers update this record themselves, so call before visiting.

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

NPPES lists California license number G37824, 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.