DR. LEAH E. GROSSMAN MD
NPI 1710542824
Internal Medicine in Oxnard, CA
About Dr. Leah E. Grossman Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LEAH E. GROSSMAN MD (NPI 1710542824) is an individual internal medicine provider in Oxnard, California, licensed in California (A178486) and active in the NPI registry since May 2019. She is enrolled in Medicare PECOS and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses
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. Leah E. Grossman Md 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 Reassignments
4Medicare enrollment records show Leah Grossman reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Thousand Oaks, CA 91320
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: Grossman And Grossman Mds A Medical Corporation
- 3 clinicians in this Medicare group
Torrance, CA 90503
- Reassigned Medicare billing, California enrollment
- 36 clinicians in this Medicare group
San Pedro, CA 90732
- Reassigned Medicare billing, California enrollment
- 31 clinicians in this Medicare group
San Bernardino, CA 92404
- Reassigned Medicare billing, California enrollment
- 1,216 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 6
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 93030 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.
OXNARD, CA 93030
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 Leah Grossman's NPI number?
The NPI number for Leah Grossman is 1710542824. It was assigned to this individual provider in the NPPES registry on May 3, 2019.
Where is Leah Grossman located?
Leah Grossman practices at 1600 N Rose Ave, Oxnard, CA 93030. The listed phone number is (805) 988-2505.
What is Leah Grossman's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Leah Grossman enrolled in Medicare?
Yes. Leah 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 organizations bill Medicare for Leah Grossman's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Leah Grossman reassigns Medicare benefits to 4 organizations: Grossman And Grossman M D S A Medical Corporation (Thousand Oaks, CA), Little Company Hospitalist Medical Group Inc (Torrance, CA), San Pedro Hospitalist Medical Group Inc (San Pedro, CA) and Inpatient Specialists Of California, PC (San Bernardino, CA). Each 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 Leah 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 Leah Grossman was last updated on November 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Dr. Leah E. Grossman, MD · NPI 1710542824
Internal Medicine physician in Oxnard, California. Individual provider, active in the CMS NPPES registry since May 3, 2019.
## Identity
- **NPI:** 1710542824 (Entity type: Individual)
- **Enumerated:** May 3, 2019
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A178486 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1600 N ROSE AVE, Oxnard, CA 93030-3722
- **Phone:** (805) 988-2505
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Grossman And Grossman M D S A Medical Corporation (NPI 1255483525, Thousand Oaks, CA); Little Company Hospitalist Medical Group Inc (NPI 1740141969, Torrance, CA); San Pedro Hospitalist Medical Group Inc (NPI 1750245783, San Pedro, CA); Inpatient Specialists Of California, PC (NPI 1952792475, San Bernardino, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2019
## Record status
- **NPPES last updated:** November 24, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1710542824) · Data from the CMS NPPES public registry.