Claire Zar-Kessler, MD
Pediatric Gastroenterology Physician · Boston, MA
Claire Zar-Kessler, MD is a pediatric gastroenterology physician with a practice address in Boston, Massachusetts, and NPI 1437384633, issued on May 18, 2009. Check the license (Massachusetts 253124, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Claire Zar-Kessler
- Credential
- MD
- Primary taxonomy
- Pediatric Gastroenterology Physician 2080P0206X
- License number
- 253124 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 726-8705
- Enumerated
- May 18, 2009
- Entity
- Type 1 · individual
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Affan Aamir, MD, PHARMD, RPHStudent in an Organized Health Care Education/Training Program1821890377
- Matthew AbadirAnesthesiology Physician1699120550
- Taimur AbbasiStudent in an Organized Health Care Education/Training Program1841673522
- Megan Abbott, MDAnesthesiology Physician1730839333
- Moustafa AbdallaStudent in an Organized Health Care Education/Training Program1952046062
- Shadi Abdar Esfahani, MD, MPHDiagnostic Radiology Physician1497137590
Verify Claire Zar-Kessler in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 253124Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
78% fewer Medicare Part D claims than the average pediatric gastroenterology physician in 2024
15 Medicare Part D claims, against an average of 67 among the 210 providers of this specialty who prescribed in Part D. Brand-name drugs were 80% of claims.
Most prescribed
- Trulance12 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.
One hospital or facility affiliation
- Massachusetts General Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Pediatric Gastroenterology Physician providers in Massachusetts
There are 87 pediatric gastroenterology physician records in Massachusetts.
Other pediatric gastroenterology physician records in Massachusetts
- Charalampos Agakidis, MDBoston, MA1508138173
- Anastasios Angelides, MDSpringfield, MA1265413009
- Beate Beinvogl, MD, MPHBoston, MA1881935153
- Jaime Belkind-Gerson, M.D., MSCBoston, MA1609193440
- Tal BergerBoston, MA1184346967
- Elana Bern, MD, MPHBoston, MA1598785727
- Silvana Bonilla, M.D.Boston, MA1770749749
- Athos Bousvaros, MD, MPHBoston, MA1528174885
- Kathryn Broyles, FNP-BCBoston, MA1891355715
- Timothy Buie, M.D.Boston, MA1750338026
Common questions
What is Claire Zar-Kessler, MD's NPI number?
Claire Zar-Kessler, MD's National Provider Identifier (NPI) is 1437384633, issued on May 18, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Claire Zar-Kessler, MD located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 726-8705. Providers update this record themselves, so call before visiting.
How can I verify Claire Zar-Kessler, MD's license?
NPPES lists Massachusetts license number 253124, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Claire Zar-Kessler, MD prescribe under Medicare Part D?
In 2024, Claire Zar-Kessler, MD had 15 Medicare Part D claims; the average among pediatric gastroenterology physician prescribers was 67. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.