Daria Kotsar, MD
Internal Medicine Physician · East Boston, MA
Daria Kotsar, MD is an internal medicine physician with a practice address in East Boston, Massachusetts, and NPI 1891420725, issued on Jul 25, 2022. Check the license (Massachusetts 1023390, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Daria Kotsar
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 1023390 MA
Self-reported in NPPES; status is on the state search - Practice location
- 20 Maverick SQ, East Boston, MA 02128
- Phone
- (617) 569-5800
- Enumerated
- Jul 25, 2022
- Record last updated
- Jun 6, 2025
- Fax
- (617) 568-4685
- Medicare enrollment
- Enrolled (PECOS I20250811002757); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 20 Maverick SQ
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Tamsen Brown, MS, CGCGenetic Counselor (M.S.)1366981276
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Verify Daria Kotsar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 1023390Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
60 Medicare Part D claims for 35 beneficiaries, against an average of 3,176 among the 108,855 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.
Bills Medicare through one group practice
- Internal Medical Associates-EbnhcEast Boston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daria Kotsar among 6,825 internal medicine physician records in Massachusetts
Daria Kotsar, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 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 2022, is newer than 92% of them.
- NPI issued2022 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2021 · median 2004 among the 4,103 with a school on file
- Record last updated2025 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
32 internal medicine physician records list a practice address in East Boston
They are 32 of the 587 NPPES records with a practice address in East Boston, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in East Boston → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pengwynne Blevins, M.D.East Boston, MA 021281316925795
- Jan Dohlman, M.D.East Boston, MA 021281528046943
- Frances Kuebler, M.D.East Boston, MA 021281588642912
- Tien-Hsin Lin, M.D.East Boston, MA 021281841279593
- Stylianos Maheras, MDEast Boston, MA 021281821062621
- Stephanie Quamo, M.D.East Boston, MA 021281457339731
- Vicki Rieder, M.D.East Boston, MA 021281992783278
- Suzanne Sarfaty, M.D.East Boston, MA 021281447238720
Common questions
What is Daria Kotsar, MD's NPI number?
Daria Kotsar, MD's National Provider Identifier (NPI) is 1891420725, issued on Jul 25, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Daria Kotsar, MD located?
The NPPES record lists a practice address at 20 Maverick SQ, East Boston, MA, 02128. Phone: (617) 569-5800. Providers update this record themselves, so call before visiting.
How can I verify Daria Kotsar, MD's license?
NPPES lists Massachusetts license number 1023390, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Daria Kotsar, MD prescribe under Medicare Part D?
In 2024, Daria Kotsar, MD had 60 Medicare Part D claims for 35 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.