Quick answers
- Where does Thaddeus Mamienski see patients?
- Medicare's clinician data lists 4 practice locations, including Washington, DC, Olney, MD and Silver, MD. Call before your visit to confirm the address.
- What is Thaddeus Mamienski's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Thaddeus Mamienski accept Medicare assignment?
- Yes. Medicare's clinician data says Thaddeus Mamienski accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Thaddeus Mamienski?
- (202) 429-2401, as listed in official Medicare / NPI Registry data.
- What is Thaddeus Mamienski's NPI number?
- 1104979194. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Thaddeus Mamienski is enrolled with Medicare (CMS data updated 2026-10-02).
- 1145 19th St NW, 311 Mmg at 19th Street NWWashington, DC 20036 (202) 429‑2401
- 18101 Prince Philip DrOlney, MD 20832 (301) 570‑7404
- 18105 Prince Philip DrOlney, MD 20832 (301) 774‑8962
- 2415 Musgrove RdSilver, MD 20904 (301) 384‑4788
Group practices
Medicare enrollment lists Thaddeus Mamienski as a member of this group (CMS data updated 2026-10-02).
- MedStar Medical Group II LLC3,767 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Find other Obstetrics/Gynecology doctors in District of Columbia →
Other OB-GYNs in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Philadelphia College Of Osteopathic Medicine |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1104979194 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians