Mark Thomas Ackerman, MD
Internal Medicine Physician · Los Angeles, CA
Mark Thomas Ackerman, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1144225046, issued on Jun 16, 2005. Check the license (California A060600, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mark Thomas Ackerman
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A060600 CA
Self-reported in NPPES; status is on the state search - Practice location
- 221 Westwood Plz, Los Angeles, CA 90095
- Phone
- (310) 794-5555
- Enumerated
- Jun 16, 2005
- Record last updated
- Jan 6, 2025
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 221 Westwood Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Thomas Ackerman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A060600Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mark Thomas Ackerman among 17,696 internal medicine physician records in California
Mark Thomas Ackerman, 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 not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2025 · 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. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
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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- Arleen Brown, MDLos Angeles, CA 900951720013618
- Richard Buyalos, MDLos Angeles, CA 900951720012123
- Basit Chaudhry, MDLos Angeles, CA 900951992739460
- Judy Chen, MDLos Angeles, CA 900951548294846
Common questions
What is Mark Thomas Ackerman, MD's NPI number?
Mark Thomas Ackerman, MD's National Provider Identifier (NPI) is 1144225046, issued on Jun 16, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Mark Thomas Ackerman, MD located?
The NPPES record lists a practice address at 221 Westwood Plz, Los Angeles, CA, 90095. Phone: (310) 794-5555. Providers update this record themselves, so call before visiting.
How can I verify Mark Thomas Ackerman, MD's license?
NPPES lists California license number A060600, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.