DR. JACLYN M GRENTZER MD, MSCI
NPI 1215240338
Obstetrics & Gynecology - Complex Family Planning in Riverside, CA
About Dr. Jaclyn M Grentzer Md, Msci NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JACLYN M GRENTZER MD, MSCI (NPI 1215240338) is an individual complex family planning provider in Riverside, California, licensed in California (A145051) and active in the NPI registry since July 2010. She is enrolled in Medicare PECOS, maintains a secondary practice location in Agoura Hills, and is a graduate of Washington University School Of Medicine (2010).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 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
Dr. Jaclyn M Grentzer Md, Msci 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 Jaclyn Grentzer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Riverside, CA 92505
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1952333460 (California)
- 5,228 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92505 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
RIVERSIDE, CA 92505
RIVERSIDE, CA 92505
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 Jaclyn Grentzer's NPI number?
The NPI number for Jaclyn Grentzer is 1215240338. It was assigned to this individual provider in the NPPES registry on July 18, 2010.
Where is Jaclyn Grentzer located?
Jaclyn Grentzer practices at 10800 Magnolia Ave, Riverside, CA 92505. The listed phone number is (833) 574-2273.
What is Jaclyn Grentzer's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Complex Family Planning, with taxonomy code 207VC0300X.
Is Jaclyn Grentzer enrolled in Medicare?
Yes. Jaclyn Grentzer 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 Jaclyn Grentzer's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jaclyn Grentzer reassigns Medicare benefits to Southern California Permanente Medical Group (Riverside, 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 Jaclyn Grentzer'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 Jaclyn Grentzer was last updated on September 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 40 days 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.
# Dr. Jaclyn M Grentzer, MD, MSCI · NPI 1215240338
Complex Family Planning physician in Riverside, California. Individual provider, active in the CMS NPPES registry since July 18, 2010.
## Identity
- **NPI:** 1215240338 (Entity type: Individual)
- **Enumerated:** July 18, 2010
- **Primary specialty:** Obstetrics & Gynecology - Complex Family Planning · taxonomy 207VC0300X
- **State license:** A145051 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 10800 MAGNOLIA AVE, Riverside, CA 92505-3043
- **Phone:** (833) 574-2273
## 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:** Southern California Permanente Medical Group (NPI 1316979834, Riverside, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Washington University School Of Medicine, class of 2010
## Record status
- **NPPES last updated:** September 29, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1215240338) · Data from the CMS NPPES public registry.