DR. JENNIFER LOEB SISCO MD
NPI 1366869471
Internal Medicine in Oxnard, CA
About Dr. Jennifer Loeb Sisco Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JENNIFER LOEB SISCO MD (NPI 1366869471) is an individual internal medicine provider in Oxnard, California, licensed in California (A148364) and active in the NPI registry since March 2014. She is enrolled in Medicare PECOS, maintains 3 additional practice locations, and is a graduate of University Of Illinois College Of Med (chi/peor/rock/chm-urb) (2014).
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
Secondary Practice Locations 3
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. Jennifer Loeb Sisco 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 Reassignments
2Medicare enrollment records show Jennifer Sisco reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Oxnard, CA 93036
- Reassigned Medicare billing, California enrollment
- 31 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 93030 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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 Jennifer Sisco's NPI number?
The NPI number for Jennifer Sisco is 1366869471. It was assigned to this individual provider in the NPPES registry on March 26, 2014. The provider is also known as Mrs. Jennifer Michelle Loeb MD.
Where is Jennifer Sisco located?
Jennifer Sisco practices at St. John's Regional Medical Center -1600 N Rose Avenue, Oxnard, CA 93030. The listed phone number is (000) 000-0000.
What is Jennifer Sisco's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Jennifer Sisco enrolled in Medicare?
Yes. Jennifer Sisco 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 organizations bill Medicare for Jennifer Sisco's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jennifer Sisco reassigns Medicare benefits to 2 organizations: West Coast Critical Care Specialists, Inc. (Oxnard, CA) and Inpatient Specialists Of California, PC (San Bernardino, CA). Each 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 Jennifer Sisco'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 Jennifer Sisco was last updated on December 17, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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. Jennifer Loeb Sisco, MD · NPI 1366869471
Internal Medicine physician in Oxnard, California. Individual provider, active in the CMS NPPES registry since March 26, 2014.
## Identity
- **NPI:** 1366869471 (Entity type: Individual)
- **Enumerated:** March 26, 2014
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A148364 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** ST. JOHN'S REGIONAL MEDICAL CENTER -1600 N ROSE AVENUE, Oxnard, CA 93030
- **Phone:** (000) 000-0000 · **Fax:** (805) 485-3025
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): West Coast Critical Care Specialists, Inc. (NPI 1861707770, Oxnard, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Illinois College Of Med, class of 2014
## Record status
- **NPPES last updated:** December 17, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1366869471) · Data from the CMS NPPES public registry.