Karen Yang-Yu Xiao, MD
Gastroenterology Physician · New Haven, CT
Karen Yang-Yu Xiao, MD is a gastroenterology physician with a practice address in New Haven, Connecticut, and NPI 1396232922, issued on Apr 19, 2018. Check the license (Connecticut 78960, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Karen Yang-Yu Xiao
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- 78960 CT
Self-reported in NPPES; status is on the state search - Practice location
- 20 York St, New Haven, CT 06510
- Phone
- (203) 688-4242
- Enumerated
- Apr 19, 2018
- Record last updated
- Jul 19, 2024
- Medicare enrollment
- Enrolled (PECOS I20240905004238); accepts Medicare assignment
- Medical or professional school
- University Of Connecticut School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 336 in Connecticut → Look up another NPI →
Also registered at 20 York St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Cyrena Abbasi, MDStudent in an Organized Health Care Education/Training Program1609703289
- Ali Abboud, MD, MBAStudent in an Organized Health Care Education/Training Program1942943097
- Basil Abdalla, MDStudent in an Organized Health Care Education/Training Program1154905057
- Jasmina AbdallaStudent in an Organized Health Care Education/Training Program1700638590
- Sarah AbdallahPsychiatry Physician1740800952
- Usama Abdelghany, PHARM DOncology Pharmacist1548827843
Verify Karen Yang-Yu Xiao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 78960Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average gastroenterology physician in 2024
38 Medicare Part D claims for 23 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 34% of claims.
Most prescribed
- Linzess12 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
- Cornell Scott Hill Health CorporationNew Haven, CT
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen Yang-Yu Xiao among 336 gastroenterology physician records in Connecticut
Karen Yang-Yu Xiao, MD is one of 336 gastroenterology physician records with a practice address in Connecticut. 86% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 92% of them.
- NPI issued2018 · 92% of these records are older, 4% newer
- In a Medicare fileYes · 86% of these records are
- In the CMS Doctors and Clinicians fileYes · 76% of these records are
- Graduated2018 · median 2001 among the 255 with a school on file
- Record last updated2024 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Connecticut
There are 336 gastroenterology physician records in Connecticut.
All 336 in Connecticut → Every provider in New Haven → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Harry Aslanian, MDNew Haven, CT 065101295718401
- Sidney Bogardus, MDNew Haven, CT 065101730131103
- James Boyer, M.D.New Haven, CT 065101447233267
- Samuel Feldshon, MDNew Haven, CT 065101861464547
- Rosemarie Fisher, MDNew Haven, CT 065101174507685
- Guadalupe Garcia Tsao, MDNew Haven, CT 065101194706416
- Wolfram Goessling, MD PHDNew Haven, CT 065101083696298
- Chul Hyun, MDNew Haven, CT 065101467540401
Common questions
What is Karen Yang-Yu Xiao, MD's NPI number?
Karen Yang-Yu Xiao, MD's National Provider Identifier (NPI) is 1396232922, issued on Apr 19, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Karen Yang-Yu Xiao, MD located?
The NPPES record lists a practice address at 20 York St, New Haven, CT, 06510. Phone: (203) 688-4242. Providers update this record themselves, so call before visiting.
How can I verify Karen Yang-Yu Xiao, MD's license?
NPPES lists Connecticut license number 78960, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Karen Yang-Yu Xiao, MD prescribe under Medicare Part D?
In 2024, Karen Yang-Yu Xiao, MD had 38 Medicare Part D claims for 23 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.