John William Marcum, MD
Critical Care Medicine (Anesthesiology) Physician · Camarillo, CA
John William Marcum, MD is a critical care medicine (anesthesiology) physician with a practice address in Camarillo, California, and NPI 1902885957, issued on Jan 10, 2006. Check the license (California A75408, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John William Marcum
- Credential
- MD
- Primary taxonomy
- Critical Care Medicine (Anesthesiology) Physician 207LC0200X
- License number
- A75408 CA
Self-reported in NPPES; status is on the state search - Practice location
- 5021 Verdugo Way, Camarillo, CA 93012
- Phone
- (805) 338-2395
- Enumerated
- Jan 10, 2006
- Record last updated
- Mar 19, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (805) 830-0321
- Medicare enrollment
- Enrolled (PECOS I20100805000077); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1999
- Entity
- Type 1 · individual
8 nearest critical care medicine (anesthesiology) physician records → All 146 in California → Look up another NPI →
Verify John William Marcum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A75408Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Childrens Hospital Los Angeles Medical Group IncLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John William Marcum among 146 critical care medicine (anesthesiology) physician records in California
John William Marcum, MD is one of 146 critical care medicine (anesthesiology) physician records with a practice address in California. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 72% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 84% of these records are
- Graduated1999 · median 2009 among the 123 with a school on file
- Record last updated2015 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207LC0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Critical Care Medicine (Anesthesiology) Physician providers in California
There are 146 critical care medicine (anesthesiology) physician records in California.
All 146 in California → Every provider in Camarillo → Critical Care Medicine (Anesthesiology) Physician nationwide →
The 8 critical care medicine (anesthesiology) physician records with the nearest ZIP codes
- Lisa Colosimo, D.O.Orange, CA 928681356640718
- Sonali Rao, M.D.Orange, CA 928681154734572
- Trung Vu, MDOrange, CA 928681578604328
- Josue Guzman, MDVisalia, CA 932911457856031
- Michael Tang, MDVisalia, CA 932911831458553
- Karvier Yates, M.D.Bishop, CA 935141902033574
- Allen Botimer, M.D.Loma Linda, CA 923541558707521
- Melody Chang, MDLoma Linda, CA 923541144493149
Common questions
What is John William Marcum, MD's NPI number?
John William Marcum, MD's National Provider Identifier (NPI) is 1902885957, issued on Jan 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John William Marcum, MD located?
The NPPES record lists a practice address at 5021 Verdugo Way, Camarillo, CA, 93012. Phone: (805) 338-2395. Providers update this record themselves, so call before visiting.
How can I verify John William Marcum, MD's license?
NPPES lists California license number A75408, 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. Medicare files from data.cms.gov. 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.