Sebastian G. Sepulveda, MD
Nephrology Physician · Chelmsford, MA
Sebastian G. Sepulveda, MD is a nephrology physician with a practice address in Chelmsford, Massachusetts, and NPI 1558343129, issued on Nov 18, 2005. Check the license (Massachusetts 204365, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Sebastian G. Sepulveda
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 204365 MA
Self-reported in NPPES; status is on the state search - Practice location
- 9 North RD, Chelmsford, MA 01824
- Phone
- (978) 458-2005
- Enumerated
- Nov 18, 2005
- Record last updated
- Feb 9, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (978) 452-5975
- Medicaid IDs
- 0168211 MA
9751581 MA - Medicare enrollment
- Enrolled (PECOS I20050602000805); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 417 in Massachusetts → Look up another NPI →
Also registered at 9 North RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dina Eliopoulos, M.D.Plastic Surgery Physician1033198247
Verify Sebastian G. Sepulveda in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 204365Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.8 times the Medicare Part D claims of the average nephrology physician in 2024
5,543 Medicare Part D claims for 615 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 49 claims were for opioids.
Most prescribed
- Amlodipine Besylate408 claims
- Atorvastatin Calcium379 claims
- Metoprolol Succinate365 claims
- Calcitriol352 claims
- Lisinopril283 claims
- Losartan Potassium255 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 2 group practices
- Commonwealth Medical Practice LLCChelmsford, MA
- Lowell General Inpatient Specialists PLLCLowell, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sebastian G. Sepulveda among 417 nephrology physician records in Massachusetts
Sebastian G. Sepulveda, MD is one of 417 nephrology physician records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated1988 · median 2001 among the 295 with a school on file
- Record last updated2017 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in Massachusetts
There are 417 nephrology physician records in Massachusetts.
All 417 in Massachusetts → Every provider in Chelmsford → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Emily Dulude, M.D.Haverhill, MA 018301477661791
- Franklin Segall, M.D.Andover, MA 018101861453573
- Michael Landman, M.D.Lawrence, MA 018411013039601
- Amin Paulino, MDLawrence, MA 018411699022160
- Beth Bouthot, MDBurlington, MA 018051275600926
- Eric Kerns, MDBurlington, MA 018051013189174
- Zeeshan Khawaja, MDBurlington, MA 018051770776148
- Periklis KyriazisBurlington, MA 018051598297319
Common questions
What is Sebastian G. Sepulveda, MD's NPI number?
Sebastian G. Sepulveda, MD's National Provider Identifier (NPI) is 1558343129, issued on Nov 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Sebastian G. Sepulveda, MD located?
The NPPES record lists a practice address at 9 North RD, Chelmsford, MA, 01824. Phone: (978) 458-2005. Providers update this record themselves, so call before visiting.
How can I verify Sebastian G. Sepulveda, MD's license?
NPPES lists Massachusetts license number 204365, 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 Sebastian G. Sepulveda, MD prescribe under Medicare Part D?
In 2024, Sebastian G. Sepulveda, MD had 5,543 Medicare Part D claims for 615 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.