Masuma Chowdhury, M.D.
Internal Medicine Physician · Hillsboro, OR
Masuma Chowdhury, M.D. is an internal medicine physician with a practice address in Hillsboro, Oregon, and NPI 1861572604, issued on Oct 16, 2006. Check the license (Oregon MD26859, as entered in NPPES) on the Oregon Medical Board; the Medicare figures below come from public CMS files.
- Name
- Masuma Chowdhury
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD26859 OR
Self-reported in NPPES; status is on the state search - Practice location
- 364 SE 8TH Ave, Hillsboro, OR 97123
- Phone
- (503) 681-4233
- Enumerated
- Oct 16, 2006
- Record last updated
- May 19, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (503) 681-4234
- Medicaid ID
- 278494 OR
- Medicare enrollment
- Enrolled (PECOS I20070508000112); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 364 SE 8TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Masuma Chowdhury in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersOregon Medical Board
Search for license MD26859Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average internal medicine physician in 2024
8,413 Medicare Part D claims for 874 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 359 claims were for opioids.
Most prescribed
- Atorvastatin Calcium704 claims
- Levothyroxine Sodium373 claims
- Lisinopril351 claims
- Losartan Potassium318 claims
- Simvastatin300 claims
- Amlodipine Besylate248 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.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The NorthwestClackamas, OR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
65 internal medicine physician records list a practice address in Hillsboro
They are 65 of the 3,302 NPPES records with a practice address in Hillsboro, and 2,116 internal medicine physician records in Oregon.
All 65 in Hillsboro → All 2,116 in Oregon → Every provider in Hillsboro →
Other internal medicine physician records in Oregon
- Charmaine Clarisse Abalos, M.D.Medford, OR1700376050
- Soraya Abbassian, M.D.Portland, OR1225029184
- Mohamed Abdel Khalek, M.DRoseburg, OR1972687390
- Rand AbedalweliPortland, OR1265019996
- Robert Abernathy, M.D.Bend, OR1063433449
- Rebecca Abney, D.O.Portland, OR1881984748
- Mohamed Aboukhashan, MDMedford, OR1932350782
- Allison Abraham, D.O.Portland, OR1831488444
- Heidi Abreu Pacheco, M.DMount Angel, OR1669691721
- Hennie Abrio, MDRoseburg, OR1891925129
Common questions
What is Masuma Chowdhury, M.D.'s NPI number?
Masuma Chowdhury, M.D.'s National Provider Identifier (NPI) is 1861572604, issued on Oct 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Masuma Chowdhury, M.D. located?
The NPPES record lists a practice address at 364 SE 8TH Ave, Hillsboro, OR, 97123. Phone: (503) 681-4233. Providers update this record themselves, so call before visiting.
How can I verify Masuma Chowdhury, M.D.'s license?
NPPES lists Oregon license number MD26859, as entered by the provider. Search the Oregon Medical Board at https://www.oregon.gov/OMB/Pages/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Masuma Chowdhury, M.D. prescribe under Medicare Part D?
In 2024, Masuma Chowdhury, M.D. had 8,413 Medicare Part D claims for 874 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.