Mark Isaac Lieber, MD
Internal Medicine Physician · Los Angeles, CA
Mark Isaac Lieber, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1467072678, issued on Apr 17, 2020. Check the license (California A185243, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark Isaac Lieber
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A185243 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1300 N Mission RD, Los Angeles, CA 90033
- Phone
- (323) 409-8255
- Enumerated
- Apr 17, 2020
- Record last updated
- Jul 17, 2023
- Medicaid ID
- 799077400 MD
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1300 N Mission RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Isaac Lieber in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A185243Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
493 Medicare Part D claims for 49 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Biktarvy44 claims
- Atorvastatin Calcium27 claims
- Sertraline Hcl18 claims
- Levothyroxine Sodium17 claims
- Descovy16 claims
- Pantoprazole Sodium16 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: $444.73
16 payments; by number, the most common kind was food and beverage; the largest payer was Gilead Sciences, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Mark Isaac Lieber among 17,696 internal medicine physician records in California
Mark Isaac Lieber, 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 2020, is newer than 89% of them.
- NPI issued2020 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2023 · 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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- Jenny Hwang, M.D.Los Angeles, CA 900331578548764
- Michael Karp, M.D.Los Angeles, CA 900331336177229
Common questions
What is Mark Isaac Lieber, MD's NPI number?
Mark Isaac Lieber, MD's National Provider Identifier (NPI) is 1467072678, issued on Apr 17, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mark Isaac Lieber, MD located?
The NPPES record lists a practice address at 1300 N Mission RD, Los Angeles, CA, 90033. Phone: (323) 409-8255. Providers update this record themselves, so call before visiting.
How can I verify Mark Isaac Lieber, MD's license?
NPPES lists California license number A185243, 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 Isaac Lieber, MD prescribe under Medicare Part D?
In 2024, Mark Isaac Lieber, MD had 493 Medicare Part D claims for 49 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.