Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Theresa J Hallenen, OT

Individual provider Occupational Therapist · NPI 1811263502

Theresa J Hallenen, OT is registered under Occupational Therapist in Private Practice in Waldorf, Maryland. Qualified in 2009, 17 years ago. Practices with Duke University Health System, Inc, a 1,082-clinician group and accepts Medicare assignment. Licensed in Maryland.

Years since qualifying
17
Licensed in
MD
In the registry since
2012
What do these letters mean?
OT — Occupational Therapist
Helps people regain the skills needed for daily living and work.

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Practice location Address checks out

3 Post Ofc RD
Waldorf, MD 20602-2756 Not confirmed with CMS for 14 years — call before visiting
Phone: (301) 540-6140
Fax: (301) 540-5190
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Occupational Therapist (primary) Taxonomy 225X00000X · Licence 06359 (MD)

Record details

NPI number1811263502
Entity typeIndividual (Type 1)
GenderFemale
Credentials OT
Sole proprietorNo
NPI enumeratedMarch 27, 2012
Last updated in NPPESMarch 27, 2012

Medicare enrollment

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

Medicare specialtyOCCUPATIONAL THERAPIST IN PRIVATE PRACTICE
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Duke University Health System, Inc — 1082 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients17
Services billed 160 a service is one billed item, such as a visit, a test or a procedure
Average patient age68

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 Duke University Health System, Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1082 clinicians in the practice; 12 are shown here.

Other providers in Waldorf