Thaddeus Demetrius Mamienski, D.O.
Obstetrics & Gynecology Physician · Bethesda, MD
Thaddeus Demetrius Mamienski, D.O. is an obstetrics & gynecology physician with a practice address in Bethesda, Maryland, and NPI 1104979194, issued on Jan 21, 2007. Check the license on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Thaddeus Demetrius Mamienski
- Credential
- D.O.
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 0102201967 VA
Self-reported in NPPES; status is on the state search - Practice location
- 8901 Wisconsin Ave, Bethesda, MD 20889
- Phone
- (215) 872-7216
- Enumerated
- Jan 21, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20131026000076); accepts Medicare assignment
- Medical or professional school
- Philadelphia College Of Osteopathic Medicine, 2005
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 1,034 in Maryland → Look up another NPI →
Also registered at 8901 Wisconsin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thaddeus Demetrius Mamienski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of PhysiciansCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average obstetrics & gynecology physician in 2024
19 Medicare Part D claims, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.2 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Medstar Medical Group II LLCWashington, DC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thaddeus Demetrius Mamienski among 1,034 obstetrics & gynecology physician records in Maryland
Thaddeus Demetrius Mamienski, D.O. is one of 1,034 obstetrics & gynecology physician records with a practice address in Maryland. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 47% of them.
- NPI issued2007 · 47% of these records are older, 42% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated2005 · median 2005 among the 597 with a school on file
- Record last updated2007 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Maryland
There are 1,034 obstetrics & gynecology physician records in Maryland.
All 1,034 in Maryland → Every provider in Bethesda → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Jill Brown, M.D.Bethesda, MD 208891407831902
- Rebecca Chason, M.D.Bethesda, MD 208891477696003
- Christine Dorr, M.D.Bethesda, MD 208891871567123
- Susan Dunlow, M.D.Bethesda, MD 208891053384446
- William Haffner, M.D.Bethesda, MD 208891871594291
- Ernest Lockrow, DOBethesda, MD 208891043334808
- Michelle Lyons, M.D.Bethesda, MD 208891174724397
- Hugh Mackay, M.D.Bethesda, MD 208891346232261
Common questions
What is Thaddeus Demetrius Mamienski, D.O.'s NPI number?
Thaddeus Demetrius Mamienski, D.O.'s National Provider Identifier (NPI) is 1104979194, issued on Jan 21, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thaddeus Demetrius Mamienski, D.O. located?
The NPPES record lists a practice address at 8901 Wisconsin Ave, Bethesda, MD, 20889. Phone: (215) 872-7216. Providers update this record themselves, so call before visiting.
How can I verify Thaddeus Demetrius Mamienski, D.O.'s license?
Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thaddeus Demetrius Mamienski, D.O. prescribe under Medicare Part D?
In 2024, Thaddeus Demetrius Mamienski, D.O. had 19 Medicare Part D claims; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
What is Thaddeus Demetrius Mamienski, D.O.'s MIPS final score?
The 2023 MIPS final score is 80.2 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.