Wei Sum Li, M.D.
Internal Medicine Physician · Charlestown, MA
Wei Sum Li, M.D. is an internal medicine physician with a practice address in Charlestown, Massachusetts, and NPI 1629425046, issued on May 16, 2016. Check the license (Massachusetts 283634, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Wei Sum Li
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 283634 MA
LP03593 RI
MD16644 RI
Self-reported in NPPES; status is on the state search - Practice location
- 73 High St, Charlestown, MA 02129
- Phone
- (617) 724-8135
- Enumerated
- May 16, 2016
- Record last updated
- Oct 2, 2022
- Medicare enrollment
- Enrolled (PECOS I20220512001479); accepts Medicare assignment
- Medical or professional school
- University Of Massachusetts Medical School, 2016
- 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 73 High St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Quinn Almerico-Leclair, LICSWClinical Social Worker1902158173
- Chelsea AtzingerClinical Social Worker1093452187
- Christina Biagiotti, P.T.Physical Therapist1942337704
- Robin BleicherClinical Social Worker1104717289
- Tiara Calhoun, MDPulmonary Disease Physician1902326101
- Sara Callahan, FNPFamily Nurse Practitioner1942722533
Verify Wei Sum Li in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 283634Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,133 Medicare Part D claims for 250 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. 194 claims were for opioids.
Most prescribed
- Atorvastatin Calcium241 claims
- Omeprazole156 claims
- Oxycodone Hcl156 claims
- Gabapentin135 claims
- Lisinopril114 claims
- Amlodipine Besylate113 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
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Wei Sum Li among 6,825 internal medicine physician records in Massachusetts
Wei Sum Li, M.D. 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 2016, is newer than 77% of them.
- NPI issued2016 · 77% of these records are older, 21% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2016 · median 2004 among the 4,103 with a school on file
- Record last updated2022 · 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).
12 internal medicine physician records list a practice address in Charlestown
They are 12 of the 421 NPPES records with a practice address in Charlestown, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Charlestown → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hugo Calavia Liano, MDBoston, MA 021291568026367
- Caitlin Cohen, MDCharlestown, MA 021291710368121
- Michael Garrity, MDCharlestown, MA 021291932181369
- Lauren Glickman, MDCharlestown, MA 021291508856808
- Rajani Larocca, MDCharlestown, MA 021291144204884
- Joyce Liu, MDCharlestown, MA 021291144395179
- Cheryl Monteiro, MDCharlestown, MA 021291649700253
- James Morrill, MD PHDCharlestown, MA 021291952419764
Common questions
What is Wei Sum Li, M.D.'s NPI number?
Wei Sum Li, M.D.'s National Provider Identifier (NPI) is 1629425046, issued on May 16, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Wei Sum Li, M.D. located?
The NPPES record lists a practice address at 73 High St, Charlestown, MA, 02129. Phone: (617) 724-8135. Providers update this record themselves, so call before visiting.
How can I verify Wei Sum Li, M.D.'s license?
NPPES lists Massachusetts license number 283634, 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 Wei Sum Li, M.D. prescribe under Medicare Part D?
In 2024, Wei Sum Li, M.D. had 3,133 Medicare Part D claims for 250 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.