WILLOW BROOK CRITICAL CARE MEDICAL GROUP, INC
NPI 1811520224
Hospitalist in Glendale, CA
About Willow Brook Critical Care Medical Group, Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLOW BROOK CRITICAL CARE MEDICAL GROUP, INC (NPI 1811520224) is a healthcare organization registered as a hospitalist in Glendale, California and active in the NPI registry since February 2020. The organization lists Steven Peter Maron, Md, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Willow Brook Critical Care Medical Group, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Clinicians Billing Medicare Through This Organization
61Medicare enrollment records show 61 clinicians reassign Medicare billing to Willow Brook Critical Care Medical Group, Inc, which bills Medicare for the services they deliver. Of these, 4 practice at this address and 18 within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 9
Nearest to this location (20)
See all 61Source: 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 Willow Brook Critical Care Medical Group, Inc's NPI number?
The NPI number for Willow Brook Critical Care Medical Group, Inc is 1811520224. It was assigned to this organization in the NPPES registry on February 14, 2020.
Where is Willow Brook Critical Care Medical Group, Inc located?
Willow Brook Critical Care Medical Group, Inc is located at 1420 S Central Ave, Glendale, CA 91204. The listed phone number is (448) 474-4019.
What is Willow Brook Critical Care Medical Group, Inc's specialty?
The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.
Is Willow Brook Critical Care Medical Group, Inc enrolled in Medicare?
Yes. Willow Brook Critical Care Medical Group, Inc is registered in the Medicare PECOS enrollment system.
How many clinicians bill Medicare through Willow Brook Critical Care Medical Group, Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 61 clinicians in 9 Medicare specialties reassign their Medicare billing to Willow Brook Critical Care Medical Group, Inc. A 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 the clinician's services. The largest specialties are Nurse Practitioner (20), Critical Care (Intensivists) (11) and Anesthesiology (9). Of these, 4 practice at this address and 18 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
When was this NPI record last updated?
The NPPES record for Willow Brook Critical Care Medical Group, Inc was last updated on February 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.
# Willow Brook Critical Care Medical Group, Inc · NPI 1811520224
Hospitalist organization in Glendale, California. Organization record, active in the CMS NPPES registry since February 14, 2020.
## Identity
- **NPI:** 1811520224 (Entity type: Organization)
- **Enumerated:** February 14, 2020
- **Primary specialty:** Hospitalist · taxonomy 208M00000X
- **Organization subpart:** No
- **Authorized official:** Steven Maron, MD
## Practice location
- **Address:** 1420 S CENTRAL AVE, Glendale, CA 91204-2508
- **Phone:** (448) 474-4019 · **Fax:** (330) 493-8677
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Clinicians billing through this organization:** 61 clinicians in 9 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Nurse Practitioner (20), Critical Care (Intensivists) (11), Anesthesiology (9); 4 practice at this address and 18 within 10 miles; [full list](https://npiprofile.com/npi/1811520224/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** February 12, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1811520224) · Data from the CMS NPPES public registry.