Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mark Leonard Katz, MD

Individual provider Addiction Psychiatry Physician · NPI 1558478941

Dr. Mark Leonard Katz, MD is an Addiction Psychiatry Physician in Long Beach, California. Licensed in California. Registered with an NPI since 2006.

Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

5901 E 7th St Mailcode #006/116A - Mental Health CG
Long Beach, CA 90822-5201
Phone: (562) 826-8000
Fax: (562) 826-5431
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Addiction Psychiatry Physician (primary) Taxonomy 2084P0802X · Licence G 62277 (CA)

Record details

NPI number1558478941
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 23, 2006
Last updated in NPPESJuly 8, 2007
Mailing address5901 E 7th St, Mailcode #006/116a - Mental Health Cg, Long Beach, CA 90822-5201

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