DR. JOHN WILLIAM MARCUM MD
NPI 1902885957
Anesthesiology - Critical Care Medicine in Camarillo, CA
About Dr. John William Marcum Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN WILLIAM MARCUM MD (NPI 1902885957) is an individual critical care medicine provider in Camarillo, California, licensed in California (A75408) and active in the NPI registry since January 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Southern California Keck School Of Medicine (1999).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John William Marcum Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show John Marcum reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Los Angeles, CA 90027
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Childrens Hospital Los Angeles Medical Group Inc
- 1,281 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Marcum's NPI number?
The NPI number for John Marcum is 1902885957. It was assigned to this individual provider in the NPPES registry on January 10, 2006.
Where is John Marcum located?
John Marcum practices at 5021 Verdugo Way, Camarillo, CA 93012. The listed phone number is (805) 338-2395.
What is John Marcum's specialty?
The primary specialty registered for this NPI is Anesthesiology, specializing in Critical Care Medicine, with taxonomy code 207LC0200X.
Is John Marcum enrolled in Medicare?
Yes. John Marcum is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for John Marcum's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Marcum reassigns Medicare benefits to Children's Hospital Los Angeles Medical Group, Inc. (Los Angeles, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Marcum's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for John Marcum was last updated on March 19, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John William Marcum, MD · NPI 1902885957
Critical Care Medicine physician in Camarillo, California. Individual provider, active in the CMS NPPES registry since January 10, 2006.
## Identity
- **NPI:** 1902885957 (Entity type: Individual)
- **Enumerated:** January 10, 2006
- **Primary specialty:** Anesthesiology - Critical Care Medicine · taxonomy 207LC0200X
- **State license:** A75408 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 5021 VERDUGO WAY, Camarillo, CA 93012-8675
- **Phone:** (805) 338-2395 · **Fax:** (805) 830-0321
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Children's Hospital Los Angeles Medical Group, Inc. (NPI 1265530653, Los Angeles, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Southern California Keck School Of Medicine, class of 1999
## Record status
- **NPPES last updated:** March 19, 2015
- **Other identifiers:** Medicare UPIN H73541
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Source: [NPI Profile](https://npiprofile.com/npi/1902885957) · Data from the CMS NPPES public registry.