Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Ellen Ottenstein

Individual provider Clinical Social Worker · NPI 1760847693

Ellen Ottenstein is a Clinical Social Worker in Rockville, Maryland. Qualified in 2012, 14 years ago. Practices with Willow Oak Therapy Center, Inc, an 18-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Maryland.

Years since qualifying
14
Licensed in
MD
In the registry since
2015
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Practice location Address checks out

15841 Crabbs Branch Way
Rockville, MD 20855-6625 Not confirmed with CMS for 10 years — call before visiting
Phone: (301) 251-8965
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Social Worker (primary) Taxonomy 1041C0700X · Licence 18014 (MD)

Record details

NPI number1760847693
Entity typeIndividual (Type 1)
GenderFemale
Sole proprietorYes
NPI enumeratedDecember 18, 2015
Last updated in NPPESDecember 18, 2015

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL SOCIAL WORKER
Medical schoolOTHER
Graduated 2012 (14 years in practice)
Group practice Willow Oak Therapy Center, Inc — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients12
Services billed 332 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Willow Oak Therapy Center, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 18 clinicians in the practice; 12 are shown here.

Other providers in Rockville