MARA POSNER D.O
NPI 1477765634
Internal Medicine - Gastroenterology in Las Vegas, NV
About Mara Posner D.o NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARA POSNER D.O (NPI 1477765634) is an individual gastroenterology provider in Las Vegas, Nevada, licensed in Nevada (DO 1494) and active in the NPI registry since May 2007. She is enrolled in Medicare PECOS and is a graduate of Other (2001).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 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
Mara Posner D.o 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
2Medicare enrollment records show Mara Posner reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Las Vegas, NV 89106
- Reassigned Medicare billing, Nevada enrollment
- 406 clinicians in this Medicare group
Las Vegas, NV 89128
- Reassigned Medicare billing, Nevada enrollment
- 608 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 4
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 89102 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
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Mara Posner's NPI number?
The NPI number for Mara Posner is 1477765634. It was assigned to this individual provider in the NPPES registry on May 3, 2007.
Where is Mara Posner located?
Mara Posner practices at 4750 W Oakey Blvd Ste 3B, Las Vegas, NV 89102. The listed phone number is (702) 877-5199.
What is Mara Posner's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Mara Posner enrolled in Medicare?
Yes. Mara Posner 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 Mara Posner's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mara Posner reassigns Medicare benefits to 2 organizations: Southwest Medical Associates, Inc (Las Vegas, NV) and Optum Medical Group II Rhodes P C (Las Vegas, NV). 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 Mara Posner'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 Mara Posner was last updated on June 4, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Mara Posner, D.O · NPI 1477765634
Gastroenterology physician in Las Vegas, Nevada. Individual provider, active in the CMS NPPES registry since May 3, 2007.
## Identity
- **NPI:** 1477765634 (Entity type: Individual)
- **Enumerated:** May 3, 2007
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** DO 1494 (Nevada)
- **Sole proprietor:** No
## Practice location
- **Address:** 4750 W OAKEY BLVD STE 3B, Las Vegas, NV 89102-1535
- **Phone:** (702) 877-5199
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Southwest Medical Associates, Inc (NPI 1659346005, Las Vegas, NV); Optum Medical Group II Rhodes P C (NPI 1790329407, Las Vegas, NV) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2001
## Record status
- **NPPES last updated:** June 4, 2020
- **Other identifiers:** Medicaid 1477765634 (NV)
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Source: [NPI Profile](https://npiprofile.com/npi/1477765634) · Data from the CMS NPPES public registry.