SIGNATURE MEDICAL CLINICS INC
NPI 1942436548
Urology in Los Angeles, CA
About Signature Medical Clinics Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SIGNATURE MEDICAL CLINICS INC (NPI 1942436548), doing business as John J. Kowalczyk, D.o., Inc., is a healthcare organization registered as an urology in Los Angeles, California and active in the NPI registry since June 2009. The organization holds a CLIA Waiver certificate valid through August 31, 2028, maintains a secondary practice location in Burbank, and lists John James Kowalczyk, President, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 2
Secondary Practice Location 1
Group Practice 1
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Signature Medical Clinics Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by November 30, 2026
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
7Medicare enrollment records show 7 clinicians reassign Medicare billing to Signature Medical Clinics Inc, which bills Medicare for the services they deliver. Of these, 2 practice at this address and 3 within 10 miles. They are listed nearest first.
Clinicians, nearest first (7)
Los Angeles, CA 90017
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
CLIA Laboratory Certificates CMS CLIA
Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.
Certificate of Waiver 05D0542929
Signature Medical Clinics, Inc · Los Angeles, CAFrequently 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 Signature Medical Clinics Inc's NPI number?
The NPI number for Signature Medical Clinics Inc is 1942436548. It was assigned to this organization in the NPPES registry on June 9, 2009. The provider is doing business as Urology Group of Southern California. The provider was formerly known as John J. Kowalczyk, D.O., Inc..
Where is Signature Medical Clinics Inc located?
Signature Medical Clinics Inc is located at 1127 Wilshire Blvd Suite 805, Los Angeles, CA 90017. The listed phone number is (213) 977-1176.
What is Signature Medical Clinics Inc's specialty?
The primary specialty registered for this NPI is Urology with taxonomy code 208800000X.
Is Signature Medical Clinics Inc enrolled in Medicare?
Yes. Signature Medical Clinics Inc is registered in the Medicare PECOS enrollment system.
When is Signature Medical Clinics Inc's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by November 30, 2026. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through Signature Medical Clinics Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 7 clinicians in 2 Medicare specialties reassign their Medicare billing to Signature Medical Clinics 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 Urology (6) and Family Practice (1). Of these, 2 practice at this address and 3 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Signature Medical Clinics Inc hold a CLIA laboratory certificate?
Yes. A Certificate of Waiver (number 05D0542929) is associated with this NPI, valid through August 31, 2028. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Signature Medical Clinics Inc was last updated on September 6, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Signature Medical Clinics Inc · NPI 1942436548
Urology organization in Los Angeles, California. Organization record, active in the CMS NPPES registry since June 9, 2009.
## Identity
- **NPI:** 1942436548 (Entity type: Organization)
- **Enumerated:** June 9, 2009
- **Primary specialty:** Urology · taxonomy 208800000X
- **Also known as:** Urology Group of Southern California (Doing Business As)
- **Organization subpart:** No
- **Authorized official:** John Kowalczyk, PRESIDENT
## Practice location
- **Address:** 1127 WILSHIRE BLVD, SUITE 805, Los Angeles, CA 90017-3901
- **Phone:** (213) 977-1176 · **Fax:** (213) 977-0668
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** November 30, 2026 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 7 clinicians in 2 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Urology (6), Family Practice (1); 2 practice at this address and 3 within 10 miles · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** September 6, 2024
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1942436548) · Data from the CMS NPPES public registry.