Mark H. Katz, MD
Internal Medicine Physician · Los Angeles, CA
Mark H. Katz, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1487725370, issued on Nov 13, 2006. Check the license (California G46046, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark H. Katz
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G46046 CA
Self-reported in NPPES; status is on the state search - Practice location
- 6041 Cadillac Ave, Los Angeles, CA 90034
- Phone
- (323) 857-2000
- Enumerated
- Nov 13, 2006
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20100920001158); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 1975
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 6041 Cadillac Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark H. Katz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G46046Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
290 Medicare Part D claims for 50 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium30 claims
- Biktarvy15 claims
- Acyclovir11 claims
- Potassium Chloride11 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark H. Katz among 17,696 internal medicine physician records in California
Mark H. Katz, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1975 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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- Allan Chen, MDLos Angeles, CA 900341003829326
- Lewis Guiss Jr., MDLos Angeles, CA 900341629145636
- David Guzman, M.D.Los Angeles, CA 900341275521494
- Eric Lee, MDLos Angeles, CA 900341275552556
- John Londono, MDLos Angeles, CA 900341184795122
Common questions
What is Mark H. Katz, MD's NPI number?
Mark H. Katz, MD's National Provider Identifier (NPI) is 1487725370, issued on Nov 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark H. Katz, MD located?
The NPPES record lists a practice address at 6041 Cadillac Ave, Los Angeles, CA, 90034. Phone: (323) 857-2000. Providers update this record themselves, so call before visiting.
How can I verify Mark H. Katz, MD's license?
NPPES lists California license number G46046, 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 H. Katz, MD prescribe under Medicare Part D?
In 2024, Mark H. Katz, MD had 290 Medicare Part D claims for 50 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.