Mark Kasow, M.D.
Family Medicine Physician · Thousand Oaks, CA
Mark Kasow, M.D. is a family medicine physician with a practice address in Thousand Oaks, California, and NPI 1619946266, issued on Mar 16, 2006. Check the license (California A39116, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Kasow
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A39116 CA
Self-reported in NPPES; status is on the state search - Practice location
- 620 E Janss RD, Thousand Oaks, CA 91360
- Phone
- (805) 495-6866
- Enumerated
- Mar 16, 2006
- Record last updated
- Mar 29, 2016 (not updated in 10 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 620 E Janss RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Munira Husain, M.D.Adult Medicine Physician1184856460
Verify Mark Kasow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A39116Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
157 Medicare Part D claims for 115 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Meloxicam25 claims
- Sulfamethoxazole-Trimethoprim20 claims
- Azithromycin19 claims
- Nitrofurantoin Mono-Macro13 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.
Mark Kasow among 17,133 family medicine physician records in California
Mark Kasow, 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 fileNo · 62% of these records are
- Record last updated2016 · 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
- 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
- Paul Reisser, M.D.Thousand Oaks, CA 913601306926142
Common questions
What is Mark Kasow, M.D.'s NPI number?
Mark Kasow, M.D.'s National Provider Identifier (NPI) is 1619946266, issued on Mar 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Kasow, M.D. located?
The NPPES record lists a practice address at 620 E Janss RD, Thousand Oaks, CA, 91360. Phone: (805) 495-6866. Providers update this record themselves, so call before visiting.
How can I verify Mark Kasow, M.D.'s license?
NPPES lists California license number A39116, 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 Mark Kasow, M.D. prescribe under Medicare Part D?
In 2024, Mark Kasow, M.D. had 157 Medicare Part D claims for 115 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.