ELLEN OTTENSTEIN
NPI 1760847693
Social Worker - Clinical in Rockville, MD
About Ellen Ottenstein NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN OTTENSTEIN (NPI 1760847693) is an individual clinical provider in Rockville, Maryland, licensed in Maryland (18014) and active in the NPI registry since December 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2012).
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
Ellen Ottenstein 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 Ellen Ottenstein reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Rockville, MD 20855
- Reassigned Medicare billing, District of Columbia enrollment
- 19 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
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 20855 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 2
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 Ellen Ottenstein's NPI number?
The NPI number for Ellen Ottenstein is 1760847693. It was assigned to this individual provider in the NPPES registry on December 18, 2015.
Where is Ellen Ottenstein located?
Ellen Ottenstein practices at 15841 Crabbs Branch Way, Rockville, MD 20855. The listed phone number is (301) 251-8965.
What is Ellen Ottenstein's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Ellen Ottenstein enrolled in Medicare?
Yes. Ellen Ottenstein 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 Ellen Ottenstein's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Ottenstein reassigns Medicare benefits to Willow Oak Therapy Center, Inc. (Rockville, MD). 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 Ellen Ottenstein'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 Ellen Ottenstein was last updated on December 18, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.
# Ellen Ottenstein · NPI 1760847693
Clinical provider in Rockville, Maryland. Individual provider, active in the CMS NPPES registry since December 18, 2015.
## Identity
- **NPI:** 1760847693 (Entity type: Individual)
- **Enumerated:** December 18, 2015
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** 18014 (Maryland)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 15841 CRABBS BRANCH WAY, Rockville, MD 20855-6625
- **Phone:** (301) 251-8965
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** Willow Oak Therapy Center, Inc. (NPI 1386620581, Rockville, MD), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2012
## Record status
- **NPPES last updated:** December 18, 2015
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Source: [NPI Profile](https://npiprofile.com/npi/1760847693) · Data from the CMS NPPES public registry.