PHILIP OSTERMANN
NPI 1821235623
Anesthesiology in Thousand Oaks, CA
About Philip Ostermann NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
PHILIP OSTERMANN (NPI 1821235623) is an individual anesthesiology provider in Thousand Oaks, California, licensed in California (A107004) and active in the NPI registry since January 2009. He is enrolled in Medicare PECOS and is a graduate of Northwestern University Feinberg Medical School (2007).
NPPES Registry Identity
Specialties & Licenses
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
Philip Ostermann 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 Philip Ostermann reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Thousand Oaks, CA 91360
- Reassigned Medicare billing, California enrollment
- 53 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 6
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.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
THOUSAND OAKS, CA 91360
THOUSAND OAKS, CA 91360
THOUSAND OAKS, CA 91360
THOUSAND OAKS, CA 91360
THOUSAND OAKS, CA 91360
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 Philip Ostermann's NPI number?
The NPI number for Philip Ostermann is 1821235623. It was assigned to this individual provider in the NPPES registry on January 15, 2009.
Where is Philip Ostermann located?
Philip Ostermann practices at 215 W Janss Rd Surgery Dept, Thousand Oaks, CA 91360. The listed phone number is (805) 370-4521.
What is Philip Ostermann's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Philip Ostermann enrolled in Medicare?
Yes. Philip Ostermann 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 Philip Ostermann's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Philip Ostermann reassigns Medicare benefits to Conejo Los Robles Anesthesiology Medical Group, Inc. (Thousand Oaks, 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 Philip Ostermann'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 Philip Ostermann was last updated on June 4, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 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.
# Philip Ostermann · NPI 1821235623
Anesthesiology physician in Thousand Oaks, California. Individual provider, active in the CMS NPPES registry since January 15, 2009.
## Identity
- **NPI:** 1821235623 (Entity type: Individual)
- **Enumerated:** January 15, 2009
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** A107004 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 215 W JANSS RD, SURGERY DEPT, Thousand Oaks, CA 91360-1847
- **Phone:** (805) 370-4521
## 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:** Conejo Los Robles Anesthesiology Medical Group, Inc. (NPI 1821171729, Thousand Oaks, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Northwestern University Feinberg Medical School, class of 2007
## Record status
- **NPPES last updated:** June 4, 2012
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Source: [NPI Profile](https://npiprofile.com/npi/1821235623) · Data from the CMS NPPES public registry.