NPPES file of Aug 9, 2026

Jonathan E. Shirman, DO

Addiction Medicine (Family Medicine) Physician · Oxnard, CA

Jonathan E. Shirman, DO is an addiction medicine (family medicine) physician with a practice address in Oxnard, California, and NPI 1326606898, issued on May 30, 2019. Check the license (California 20A22896, as entered in NPPES) on the Medical Board of California; 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
1326606898
Name
Jonathan E. Shirman
Credential
DO
Primary taxonomy
Addiction Medicine (Family Medicine) Physician 207QA0401X
License numbers
20A22896 CA
318974 NY
Self-reported in NPPES; status is on the state search
Practice location
3641 W 5TH St, Oxnard, CA 93030
Phone
(805) 985-5505
Enumerated
May 30, 2019
Record last updated
Oct 30, 2025
Medicare enrollment
Enrolled (PECOS I20240717003848); accepts Medicare assignment
Medical or professional school
Lake Erie College Of Osteopathic Medicine, Bradenton, 2019
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest addiction medicine (family medicine) physician records → All 124 in California → Look up another NPI →

Also registered at 3641 W 5TH St

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

  1. Scott Changchien, M.D.Obstetrics & Gynecology Physician1902850555
  2. Dorothea Clayton, M.D.Internal Medicine Physician1053596395
  3. Suseela Dasari, M.D.Pediatrics Physician1982658548
  4. Denia Garfias, M.D.Pediatrics Physician1992905871
  5. Mostafa Hammoudi, M.D.Neurology Physician1912027426
  6. Joel Siegel, M.D.Dermatology Physician1528056868

Verify Jonathan E. Shirman in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license 20A22896    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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92% fewer Medicare Part D claims than the average addiction medicine (family medicine) physician in 2024

56 Medicare Part D claims for 25 beneficiaries, against an average of 664 among the 581 providers of this specialty who prescribed in Part D.

  1. Jonathan Shirman56
  2. Specialty average664

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.

Industry payments in 2024: $37.00

1 payment: food and beverage; the largest payer was Indivior Inc. The 305 providers of this specialty with any payment received $1,151.00 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Jonathan Shirman$37.00
  2. Specialty average$1,151.00

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Bills Medicare through one group practice

  1. Community Memorial Health SystemOxnard, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Jonathan E. Shirman among 124 addiction medicine (family medicine) physician records in California

Jonathan E. Shirman, DO is one of 124 addiction medicine (family medicine) physician records with a practice address in California. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 75% of them.

  • NPI issued2019 · 75% of these records are older, 16% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileYes · 52% of these records are
  • Graduated2019 · median 2015 among the 64 with a school on file
  • Record last updated2025 · 33% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QA0401X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Addiction Medicine (Family Medicine) Physician providers in California

There are 124 addiction medicine (family medicine) physician records in California.

All 124 in California → Every provider in Oxnard → Addiction Medicine (Family Medicine) Physician nationwide →

The 8 addiction medicine (family medicine) physician records with the nearest ZIP codes

  1. Lorenz Choi, DOVentura, CA 930031619592623
  2. Christopher Fernandez, DOVentura, CA 930031902427404
  3. Alexander Howard, DOVentura, CA 930031528707593
  4. Tipu Khan, M.D.Ventura, CA 930031801059555
  5. Morgan Kirkpatrick, MDVentura, CA 930031457915795
  6. Matthew Lamon, DOVentura, CA 930031356835243
  7. Olivia NguyenVentura, CA 930031902478779
  8. Oluwatumininu Oludemi, DOVentura, CA 930031013656883

Common questions

What is Jonathan E. Shirman, DO's NPI number?

Jonathan E. Shirman, DO's National Provider Identifier (NPI) is 1326606898, issued on May 30, 2019. An NPI identifies a provider in billing; it is not a license.

Where is Jonathan E. Shirman, DO located?

The NPPES record lists a practice address at 3641 W 5TH St, Oxnard, CA, 93030. Phone: (805) 985-5505. Providers update this record themselves, so call before visiting.

How can I verify Jonathan E. Shirman, DO's license?

NPPES lists California license number 20A22896, 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.

How much does Jonathan E. Shirman, DO prescribe under Medicare Part D?

In 2024, Jonathan E. Shirman, DO had 56 Medicare Part D claims for 25 beneficiaries; the average among addiction medicine (family medicine) physician prescribers was 664. 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.