Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. William Stuart Asch, MD, PHD

Individual provider Internal Medicine Physician · NPI 1003933326

Dr. William Stuart Asch, MD, PHD practises Nephrology in New Haven, Connecticut. Graduated from State University of New York at Stony Brook, School of Medicine in 2001, 25 years ago. Practices with Yale University, a 2,618-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Connecticut.

Years since qualifying
25
Trained at
State University of New York at Stony Brook, School of Medicine
Licensed in
CT
In the registry since
2007
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.

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Practice location Address checks out

20 York Street Cb 2041 Hospitalist Service
New Haven, CT 06510 Not confirmed with CMS for 19 years — call before visiting
Phone: (203) 688-4748
Fax: (203) 688-4740
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence 044496 (CT)
Internal Medicine Physician Taxonomy 207R00000X · Licence 044496 (CT)
Hospitalist Physician Taxonomy 208M00000X · Licence 044496 (CT)

Record details

NPI number1003933326
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , PHD
Sole proprietorNo
NPI enumeratedMarch 23, 2007
Last updated in NPPESOctober 27, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyNEPHROLOGY
Medical schoolSTATE UNIVERSITY OF NEW YORK AT STONY BROOK, SCHOOL OF MEDICINE
Graduated 2001 (25 years in practice)
Group practice Yale University — 2618 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients228
Services billed 634 a service is one billed item, such as a visit, a test or a procedure
Average patient age65

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Yale University

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 2618 clinicians in the practice; 12 are shown here.

Other providers in New Haven