Janarthanan Someswarananthan, MD
Internal Medicine Physician · Chelmsford, MA
Janarthanan Someswarananthan, MD is an internal medicine physician with a practice address in Chelmsford, Massachusetts, and NPI 1134212830, issued on Oct 2, 2006. Check the license (Massachusetts 230684, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Janarthanan Someswarananthan
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 230684 MA
ME83087 FL
Self-reported in NPPES; status is on the state search - Practice location
- 290 Littleton RD Unit 3, Chelmsford, MA 01824
- Phone
- (978) 685-2460
- Enumerated
- Oct 2, 2006
- Record last updated
- Apr 13, 2026
- Medicare enrollment
- Enrolled (PECOS I20070413000564); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 290 Littleton RD Unit 3
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Leanne Aguirre, NPFamily Nurse Practitioner1720741465
- Rachelle Archard, CNPAdult Health Nurse Practitioner1598400079
- Laura BauerNurse Practitioner1164078838
- Diana Bishop, NPNurse Practitioner1447954177
- Amanda Bonomo, FNP-BCFamily Nurse Practitioner1912623588
- Elnora Burton, ARNPFamily Nurse Practitioner1659694768
Verify Janarthanan Someswarananthan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 230684Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11.3 times the Medicare Part D claims of the average internal medicine physician in 2024
35,893 Medicare Part D claims for 989 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Atorvastatin Calcium2,050 claims
- Trazodone Hcl1,894 claims
- Eliquis1,560 claims
- Gabapentin1,471 claims
- Amlodipine Besylate1,196 claims
- Sertraline Hcl1,083 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 3 group practices
- Beth Israel Lahey Health Primary Care, IncSouth Hamilton, MA
- Lawrence General Community Medical Service PLLCSalem, NH
- New England Community Medical Services PLLCChelmsford, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Janarthanan Someswarananthan among 6,825 internal medicine physician records in Massachusetts
Janarthanan Someswarananthan, 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1996 · median 2004 among the 4,103 with a school on file
- Record last updated2026 · 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).
34 internal medicine physician records list a practice address in Chelmsford
They are 34 of the 937 NPPES records with a practice address in Chelmsford, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Chelmsford → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Shamim Dahod, M.D.Chelmsford, MA 018241710971379
- Karen Dasilva, M.D.Chelmsford, MA 018241851364889
- Richard Deamicis, M.D.Chelmsford, MA 018241801865233
- Milton Drake, M.D.Chelmsford, MA 018241750354700
- Damian FolchChelmsford, MA 018241225002066
- Jorge Gonzalez, M.D.Chelmsford, MA 018241821081209
- Raj Gupta, M.D.Chelmsford, MA 018241346215605
- Wen Yee Lee, M.D.Chelmsford, MA 018241396701777
Common questions
What is Janarthanan Someswarananthan, MD's NPI number?
Janarthanan Someswarananthan, MD's National Provider Identifier (NPI) is 1134212830, issued on Oct 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Janarthanan Someswarananthan, MD located?
The NPPES record lists a practice address at 290 Littleton RD Unit 3, Chelmsford, MA, 01824. Phone: (978) 685-2460. Providers update this record themselves, so call before visiting.
How can I verify Janarthanan Someswarananthan, MD's license?
NPPES lists Massachusetts license number 230684, 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 Janarthanan Someswarananthan, MD prescribe under Medicare Part D?
In 2024, Janarthanan Someswarananthan, MD had 35,893 Medicare Part D claims for 989 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.