IRWIN GROSSMAN M.D.
NPI 1205004652
Radiology - Diagnostic Radiology in Oxnard, CA
About Irwin Grossman M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
IRWIN GROSSMAN M.D. (NPI 1205004652) is an individual diagnostic radiology provider in Oxnard, California, licensed in California (G19219) and active in the NPI registry since February 2008. He is enrolled in Medicare PECOS and is a graduate of State University Of New York Downstate Medical Center (1968).
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
Irwin Grossman M.d. 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 Irwin Grossman reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Encino, CA 91436
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1164760823 (California), NPI 1962457812 (California)
- 349 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 44
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 93036 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.
Other Providers at the Same Location NPPES
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Irwin Grossman's NPI number?
The NPI number for Irwin Grossman is 1205004652. It was assigned to this individual provider in the NPPES registry on February 19, 2008.
Where is Irwin Grossman located?
Irwin Grossman practices at 2001 Solar Dr Ste 135, Oxnard, CA 93036. The listed phone number is (805) 988-0616.
What is Irwin Grossman's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Irwin Grossman enrolled in Medicare?
Yes. Irwin Grossman 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 Irwin Grossman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Irwin Grossman reassigns Medicare benefits to Beverly Radiology Medical Group III (Encino, 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 Irwin Grossman'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 Irwin Grossman was last updated on May 21, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.