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

Dr. Thaddeus Demetrius Mamienski, DO

Individual provider Obstetrics & Gynecology Physician · NPI 1104979194

Dr. Thaddeus Demetrius Mamienski, DO is an Obstetrics/Gynecology in Bethesda, Maryland. Graduated from Philadelphia College of Osteopathic Medicine in 2005, 21 years ago. Practices with Medstar Medical Group II LLC, a 3,717-clinician group and accepts Medicare assignment. Licensed in Virginia.

Years since qualifying
21
Trained at
Philadelphia College of Osteopathic Medicine
Licensed in
VA
In the registry since
2007
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

8901 Wisconsin Ave Dept OF Obstetrics And Gynecology
Bethesda, MD 20889-0001
Phone: (215) 872-7216
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Obstetrics & Gynecology Physician (primary) Taxonomy 207V00000X · Licence 0102201967 (VA)

Record details

NPI number1104979194
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJanuary 21, 2007
Last updated in NPPESJuly 8, 2007

Medicare enrollment

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

Medicare specialtyOBSTETRICS/GYNECOLOGY
Medical schoolPHILADELPHIA COLLEGE OF OSTEOPATHIC MEDICINE
Graduated 2005 (21 years in practice)
Group practice Medstar Medical Group Ii Llc — 3717 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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