Russell Howard Marks, M.D.
Forensic Psychiatry Physician · San Luis Obispo, CA
Russell Howard Marks, M.D. is a forensic psychiatry physician with a practice address in San Luis Obispo, California, and NPI 1144478751, issued on Sep 8, 2008. Check the license (California G39655, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Russell Howard Marks
- Credential
- M.D.
- Primary taxonomy
- Forensic Psychiatry Physician 2084F0202X
- License number
- G39655 CA
Self-reported in NPPES; status is on the state search - Practice location
- 851 Murray Ave, San Luis Obispo, CA 93405
- Phone
- (805) 541-9327
- Enumerated
- Sep 8, 2008
- Record last updated
- Sep 8, 2008 (not updated in 18 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest forensic psychiatry physician records → All 109 in California → Look up another NPI →
Verify Russell Howard Marks in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G39655Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Russell Howard Marks among 109 forensic psychiatry physician records in California
Russell Howard Marks, M.D. is one of 109 forensic psychiatry physician records with a practice address in California. 41% 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 2008, is newer than 72% of them.
- NPI issued2008 · 72% of these records are older, 24% newer
- In a Medicare fileNo · 41% of these records are
- In the CMS Doctors and Clinicians fileNo · 14% of these records are
- Record last updated2008 · 53% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084F0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Forensic Psychiatry Physician providers in California
There are 109 forensic psychiatry physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 109 in California → Every provider in San Luis Obispo → Forensic Psychiatry Physician nationwide →
The 8 forensic psychiatry physician records with the nearest ZIP codes
- Joseph Abrahamson, MDAtascadero, CA 934221750309423
- Michael Arcuri, M.D.Atascadero, CA 934221861564296
- Jeffrey Billett, M.D.Atascadero, CA 934221790889749
- Seth Cohen, M.D.Atascadero, CA 934221386748762
- David Henderson, M.D.Atascadero, CA 934221346400249
- Justin Jones, M.D.Atascadero, CA 934221760772164
- Steven Lazrove, MDAtascadero, CA 934221225164262
- Lynn MaskelAtascadero, CA 934221134350549
Common questions
What is Russell Howard Marks, M.D.'s NPI number?
Russell Howard Marks, M.D.'s National Provider Identifier (NPI) is 1144478751, issued on Sep 8, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Russell Howard Marks, M.D. located?
The NPPES record lists a practice address at 851 Murray Ave, San Luis Obispo, CA, 93405. Phone: (805) 541-9327. Providers update this record themselves, so call before visiting.
How can I verify Russell Howard Marks, M.D.'s license?
NPPES lists California license number G39655, 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.