Jonathan A. Rosaasen, M.D.
Family Medicine Physician · Thousand Oaks, CA
Jonathan A. Rosaasen, M.D. is a family medicine physician with a practice address in Thousand Oaks, California, and NPI 1528171352, issued on Aug 16, 2006. Check the license (California A85781, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jonathan A. Rosaasen
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A85781 CA
Self-reported in NPPES; status is on the state search - Practice location
- 187 E Wilbur RD # 100, Thousand Oaks, CA 91360
- Phone
- (805) 492-1015
- Enumerated
- Aug 16, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (805) 492-2035
- Medicare enrollment
- Enrolled (PECOS I20060106000447); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 2002
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 187 E Wilbur RD # 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Amanda Rosaasen, M.D.Family Medicine Physician1497868376
Verify Jonathan A. Rosaasen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85781Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
39% fewer Medicare Part D claims than the average family medicine physician in 2024
2,147 Medicare Part D claims for 189 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 138 claims were for opioids.
Most prescribed
- Atorvastatin Calcium107 claims
- Alprazolam92 claims
- Levothyroxine Sodium74 claims
- Lisinopril54 claims
- Hydrocodone-Acetaminophen53 claims
- Zolpidem Tartrate47 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.
Industry payments in 2024: $1,611.04
95 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
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
- Rosaasen Family Medicine, Inc.Thousand Oaks, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan A. Rosaasen among 17,133 family medicine physician records in California
Jonathan A. Rosaasen, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2002 · median 2005 among the 10,652 with a school on file
- Record last updated2023 · 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 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 family medicine physician records list a practice address in Thousand Oaks
They are 39 of the 2,434 NPPES records with a practice address in Thousand Oaks, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Thousand Oaks → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Elise Bukont, D.O.Thousand Oaks, CA 913601851449888
- Cheryl Cohler, M.D.Thousand Oaks, CA 913601962454041
- Francis Dawson, M.D.Thousand Oaks, CA 913601043390883
- Mark Kasow, M.D.Thousand Oaks, CA 913601619946266
- Barry Lefkovitch, M.D.Thousand Oaks, CA 913601538111752
- Frederick Lindberg, MDThousand Oaks, CA 913601467499582
- Verna Liss, MDThousand Oaks, CA 913601093708174
- Joey Liu, M.D.Thousand Oaks, CA 913601538137013
Common questions
What is Jonathan A. Rosaasen, M.D.'s NPI number?
Jonathan A. Rosaasen, M.D.'s National Provider Identifier (NPI) is 1528171352, issued on Aug 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan A. Rosaasen, M.D. located?
The NPPES record lists a practice address at 187 E Wilbur RD # 100, Thousand Oaks, CA, 91360. Phone: (805) 492-1015. Providers update this record themselves, so call before visiting.
How can I verify Jonathan A. Rosaasen, M.D.'s license?
NPPES lists California license number A85781, 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 A. Rosaasen, M.D. prescribe under Medicare Part D?
In 2024, Jonathan A. Rosaasen, M.D. had 2,147 Medicare Part D claims for 189 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.
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.