Catherine Njiru-Sewer, D.O.
Family Medicine Physician · West River, MD
Catherine Njiru-Sewer, D.O. is a family medicine physician with a practice address in West River, Maryland, and NPI 1063914836, issued on Mar 7, 2018. Check the license on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Catherine Njiru-Sewer
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- DO035003 DC
Self-reported in NPPES; status is on the state search - Practice location
- 134 Owensville RD, West River, MD 20778
- Phone
- (410) 867-4700
- Enumerated
- Mar 7, 2018
- Record last updated
- Aug 13, 2024
- Medicare enrollment
- Enrolled (PECOS I20220822000279); accepts Medicare assignment
- Medical or professional school
- Edward Via Col Of Osteo Medicine-Virginia Campus, 2018
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 1,912 in Maryland → Look up another NPI →
Also registered at 134 Owensville RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Wayne Bierbaum, M.DInternal Medicine Physician1215993449
- Heather Brown, PACPhysician Assistant1689639445
- Amanda Court, LCPC, NCC, PHDMental Health Counselor1043933609
- Ebony Eddy, PA-CPhysician Assistant1144097973
- Jennifer EvansClinical Social Worker1659731628
- Bonnie McDonaldSocial Worker1992413496
Verify Catherine Njiru-Sewer 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
6% more Medicare Part D claims than the average family medicine physician in 2024
3,757 Medicare Part D claims for 426 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 18% of claims. 25 claims were for opioids.
Most prescribed
- Atorvastatin Calcium290 claims
- Amlodipine Besylate222 claims
- Albuterol Sulfate Hfa176 claims
- Losartan Potassium138 claims
- Diclofenac Sodium127 claims
- Lisinopril122 claims
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.
Industry payments in 2024: $31.10
1 payment: food and beverage; the largest payer was Takeda Pharmaceuticals U.S.A., Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Owensville Primary Care, IncWest River, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Catherine Njiru-Sewer among 1,912 family medicine physician records in Maryland
Catherine Njiru-Sewer, D.O. is one of 1,912 family medicine physician records with a practice address in Maryland. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 84% of them.
- NPI issued2018 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2018 · median 2004 among the 1,141 with a school on file
- Record last updated2024 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 family medicine physician records list a practice address in West River
They are 5 of the 22 NPPES records with a practice address in West River, and 1,912 family medicine physician records in Maryland.
All 1,912 in Maryland → Every provider in West River → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Jonathan Hennessee, D.O.West River, MD 207781972814192
- Daphne Metellus, MDWest River, MD 207781851975973
- Thomas Sheesley, D.O.West River, MD 207781841551645
- Gabriel Wilson, CRNP-FAMILYWest River, MD 207781245947522
- Lisa SingletaryHarwood, MD 207761720484462
- John Lilly, MDHyattsville, MD 207811528051711
- David Auh, MDUpper Marlboro, MD 207741356752588
- Olufemi Balogun, MDUpper Marlboro, MD 207741194010678
Common questions
What is Catherine Njiru-Sewer, D.O.'s NPI number?
Catherine Njiru-Sewer, D.O.'s National Provider Identifier (NPI) is 1063914836, issued on Mar 7, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Catherine Njiru-Sewer, D.O. located?
The NPPES record lists a practice address at 134 Owensville RD, West River, MD, 20778. Phone: (410) 867-4700. Providers update this record themselves, so call before visiting.
How can I verify Catherine Njiru-Sewer, 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 Catherine Njiru-Sewer, D.O. prescribe under Medicare Part D?
In 2024, Catherine Njiru-Sewer, D.O. had 3,757 Medicare Part D claims for 426 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.