Dr. Mark Leibowitz M.D.
About this NPIWhat this record shows.
NPI 1144352907 is registered to Dr. Mark Leibowitz M.D., a Internal Medicine practising at 2600 Redondo Ave, Suite 500 in Long Beach, California. Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties. Dr. Mark Leibowitz M.D. has been enumerated in the National Provider Identifier (NPI) registry since 2007.
Your brand here.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Dr. Mark Leibowitz M.D. accepts. To confirm in-network status with your specific health plan, contact Dr. Mark Leibowitz M.D. directly at (562) 304-1742.
Frequently asked
Yes. NPI 1144352907 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (562) 304-1742.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Dr. Mark Leibowitz M.D. is a Type-1 individual NPI.