OPTUM
NPI 1891981502
Internal Medicine - Addiction Medicine in Tustin, CA
About Optum NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
OPTUM (NPI 1891981502) is a healthcare organization registered as an addiction medicine in Tustin, California and active in the NPI registry since September 2007. The organization holds a CLIA Microscopy certificate valid through September 3, 2027 and lists Rebecca D. Schaumburg, Administrative Assistant, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Names 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)
Optum is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by March 31, 2027
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
2,044Medicare enrollment records show 2,044 clinicians reassign Medicare billing to Optum, which bills Medicare for the services they deliver. Of these, 189 practice within 10 miles. Listed here are the 20 practicing nearest to this location.
Clinicians by Medicare Specialty 51
Nearest to this location (20)
See all 2,044Source: 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 for Provider-Performed Microscopy Procedures (PPMP) 05D0990839
Healthcare Partners Affiliates Medical Group · Tustin, 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 Healthcare Partners Affiliates Medical Group's NPI number?
The NPI number for Healthcare Partners Affiliates Medical Group is 1891981502. It was assigned to this organization in the NPPES registry on September 18, 2007. The provider is doing business as Optum.
Where is Healthcare Partners Affiliates Medical Group located?
Healthcare Partners Affiliates Medical Group is located at 14591 Newport Ave, Tustin, CA 92780. The listed phone number is (714) 442-4864.
What is Healthcare Partners Affiliates Medical Group's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Addiction Medicine, with taxonomy code 207RA0401X.
Is Healthcare Partners Affiliates Medical Group enrolled in Medicare?
Yes. Healthcare Partners Affiliates Medical Group is registered in the Medicare PECOS enrollment system.
When is Healthcare Partners Affiliates Medical Group'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 March 31, 2027. 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 Healthcare Partners Affiliates Medical Group?
According to the CMS Revalidation Reassignment List (October 2026 release), 2,044 clinicians in 51 Medicare specialties reassign their Medicare billing to Healthcare Partners Affiliates Medical Group. 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 Internal Medicine (612), Family Practice (525) and Nurse Practitioner (373). Of these, 189 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Does Healthcare Partners Affiliates Medical Group hold a CLIA laboratory certificate?
Yes. A Certificate for Provider-Performed Microscopy Procedures (PPMP) (number 05D0990839) is associated with this NPI, valid through September 3, 2027. CLIA certificates authorize laboratory testing under the federal Clinical Laboratory Improvement Amendments program.
When was this NPI record last updated?
The NPPES record for Healthcare Partners Affiliates Medical Group was last updated on April 8, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.
# Optum · NPI 1891981502
Addiction Medicine organization in Tustin, California. Organization record, active in the CMS NPPES registry since September 18, 2007.
## Identity
- **NPI:** 1891981502 (Entity type: Organization)
- **Enumerated:** September 18, 2007
- **Primary specialty:** Internal Medicine - Addiction Medicine · taxonomy 207RA0401X
- **Legal business name:** Healthcare Partners Affiliates Medical Group
- **Organization subpart:** No
- **Authorized official:** Rebecca Schaumburg, ADMINISTRATIVE ASSISTANT
## Practice location
- **Address:** 14591 NEWPORT AVE, Tustin, CA 92780-6001
- **Phone:** (714) 442-4864
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** March 31, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 2,044 clinicians in 51 Medicare specialties reassign Medicare billing to this organization (form CMS-855R); largest: Internal Medicine (612), Family Practice (525), Nurse Practitioner (373); 189 practice within 10 miles; [full list](https://npiprofile.com/npi/1891981502/clinicians) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** April 8, 2021
- **CLIA laboratory certificates:** 1 on file
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Source: [NPI Profile](https://npiprofile.com/npi/1891981502) · Data from the CMS NPPES public registry.