ILEANA M PAT MD
NPI 1598775538
Internal Medicine - Endocrinology, Diabetes & Metabolism in West Hills, CA
About Ileana M Pat Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ILEANA M PAT MD (NPI 1598775538) is an individual endocrinology, diabetes & metabolism provider in West Hills, California, licensed in California (A69940) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1983).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
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
Ileana M Pat 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 Ileana Pat reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
West Hills, CA 91304
- Reassigned Medicare billing, California enrollment
Toledo, OR 97391
- Reassigned Medicare billing, Oregon enrollment
- 348 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 3
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 91304 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Referred Medical Equipment & Supplies CMS DME claims
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WEST HILLS, CA 91304
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 Ileana Pat's NPI number?
The NPI number for Ileana Pat is 1598775538. It was assigned to this individual provider in the NPPES registry on August 9, 2006. The provider is also known as Ileana M Postolache.
Where is Ileana Pat located?
Ileana Pat practices at 22110 Roscoe Blvd Ste 307, West Hills, CA 91304. The listed phone number is (818) 497-7857.
What is Ileana Pat's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Endocrinology, Diabetes & Metabolism, with taxonomy code 207RE0101X.
Is Ileana Pat enrolled in Medicare?
Yes. Ileana Pat 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 Ileana Pat's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ileana Pat reassigns Medicare benefits to 2 organizations: Ileana Pat Inc (West Hills, CA) and Samaritan Pacific Health Services, Inc. (Toledo, OR). 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 Ileana Pat'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 Ileana Pat was last updated on September 8, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 months 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.
# Ileana M Pat, MD · NPI 1598775538
Endocrinology, Diabetes & Metabolism physician in West Hills, California. Individual provider, active in the CMS NPPES registry since August 9, 2006.
## Identity
- **NPI:** 1598775538 (Entity type: Individual)
- **Enumerated:** August 9, 2006
- **Primary specialty:** Internal Medicine - Endocrinology, Diabetes & Metabolism · taxonomy 207RE0101X
- **State license:** A69940 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 22110 ROSCOE BLVD STE 307, West Hills, CA 91304-3860
- **Phone:** (818) 497-7857 · **Fax:** (818) 394-6966
## 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): Ileana Pat Inc (NPI 1578079117, West Hills, CA); Samaritan Pacific Health Services, Inc. (NPI 1568543692, Toledo, OR) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1983
## Record status
- **NPPES last updated:** September 8, 2025
- **Other identifiers:** Medicaid 34344800 (WI)
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Source: [NPI Profile](https://npiprofile.com/npi/1598775538) · Data from the CMS NPPES public registry.