Mark Katz, M.D.
NPI 1558478941 · Addiction Psychiatry Physician · Long Beach, CA
Mark Katz, M.D. is a Addiction Psychiatry Physician provider in Long Beach, CA (NPI 1558478941).
Provider details
- NPI number
- 1558478941
- Entity type
- Individual
- Primary specialty
- Addiction Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G 62277 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$62 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-23
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Katz's NPI number?
- Mark Katz's National Provider Identifier (NPI) is 1558478941, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Katz's specialty?
- Mark Katz is listed in the NPPES registry with a primary specialty of Addiction Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Katz located?
- Mark Katz's practice location on file with NPPES is 5901 E 7th St, Long Beach, CA 90822-5201.
- What is Mark Katz's phone number?
- The practice phone number listed in the NPPES registry for Mark Katz is (562) 826-8000.
- Is Mark Katz's NPI active?
- Yes — Mark Katz's NPI (1558478941) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.