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Dr. William Stuart Asch, MD, PhD
NPI1003933326PAC ID4082772140
- Medicare services, 2024
- 560
- Medicare patients, 2024
- 228
- Part D claims, 2024
- 1,841
- Publications
- 26
- MIPS score, 2024
- 87
- Practice address
- 20 York Street, New Haven, CT 06510
- Practice phone
- Call (203) 688-5900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Yale New Haven Psychiatric Hospital (York St)
Psychiatric Inpatient Facility · New Haven, Connecticut
Find Dr. Asch's professional email, personal email and mobile number
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Dr. William Stuart Asch is a nephrologist in New Haven, Connecticut
Dr. Asch practices at Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut.
Dr. Asch's NPI, 1003933326, was assigned on March 23, 2007. Dr. Asch graduated from Stony Brook University Health Sciences Center School of Medicine in 2001. Dr. Asch holds Connecticut license 044496.
NPI and contact details
- NPI
- 1003933326NPI Registry (opens in a new tab)
- Medicare PAC ID
- 4082772140
- NPI enumeration date
- March 23, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (203) 688-5900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 51
- Medical school graduation
- 2001
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Stuart Asch practices at Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut
Dr. Asch's primary practice is Yale New Haven Psychiatric Hospital (York St), at 20 York Street, New Haven, CT 06510. The practice phone is (203) 688-5900.
- Yale New Haven Psychiatric Hospital (York St)20 York Street, New Haven, CT 06510Phone(203) 688-5900
Source: Dmand AI Affiliation Data
Dr. William Stuart Asch is affiliated with 6 sites of care and 2 medical groups
Dr. Asch's primary practice is Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut. Dr. Asch is also affiliated with Yale New Haven Hospital. The medical group on file is Yale Health. Dmand AI also links Dr. Asch to 4 more hospitals and 1 medical group, each named with a free account.
Yale New Haven Psychiatric Hospital (York St)Primary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Stuart Asch's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Asch practices, 6 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Yale New Haven Psychiatric Hospital (York St) | Available with a free account |
| +5 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
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Dr. William Stuart Asch is one of 141 nephrologists in Connecticut
Nephrology is Dr. Asch's primary specialty in the NPI Registry, under taxonomy code 207RN0300X. Dr. Asch is licensed in Connecticut.
Specialties and state licenses
- Nephrology, ConnecticutPrimary
Nephrologists near Dr. Asch
Counts of nephrologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Stuart Asch billed Medicare for 560 services in 2024
CMS data shows 560 Medicare services from Dr. Asch across 6 procedure codes in 2024, for 228 Medicare patients. Medicare paid $40,285 for them.
Medicare services, 2024560
Medicare patients228
Paid by Medicare$40,285
Procedure codes6
Dr. Asch's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 6202024: 51816%
- Imaging
- 2023: 202024: 215%
- Surgery
- 2023: 202024: 215%
Where Dr. Asch's Medicare services took place, 2024
- In an office7013%
- In a facility49088%
Dr. Asch compared with the Connecticut median for nephrologists, 2024
- Dr. Asch
- Connecticut median
- Medicare services
- 560vs 73223% below
- Medicare patients
- 228vs 26113% below
- Part D claims
- 1,553vs 6002.6 times
Medians across 137 nephrologists in Connecticut with Dmand AI profiles that report each measure.
Dr. Asch's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Stuart Asch treated 228 Medicare patients in 2024, average age 65
CMS counts 228 Medicare patients who saw Dr. Asch in 2024. The largest group is 65 to 74, with 99 patients. 75% of them have chronic kidney disease, and 75% have high blood pressure. 31% are also on Medicaid. Their average risk score is 4.42, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Asch's median patient age at 65, with 44% women.
Medicare patients, 2024228
Average age65
Average risk score4.42
Also on Medicaid31%
Dr. Asch's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Asch's Medicare patients by sex, 2024
- Women10446%
- Men12454%
Chronic conditions among Dr. Asch's Medicare patients, 2024
- Chronic kidney disease75%
- High blood pressure75%
- High cholesterol75%
- Diabetes56%
- Ischemic heart disease40%
- Heart failure39%
- Arthritis37%
- Mood disorders33%
Share of Medicare patients with each condition. A patient can have several.
Dr. Asch's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 65
Patient panel by sex, all payers
- Women44%
- Men55%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Stuart Asch wrote 1,841 Medicare Part D claims in 2024
In 2024, Dr. Asch wrote 1,841 Medicare Part D claims for 279 patients. 92% of them were for generic drugs. CMS names the drug for 1,553 of them, across 36 drugs with 11 or more claims each, at $86,798 in total drug cost. In 2023, CMS named 1,711 claims across 36 drugs.
Part D claims, 20241,841
Drugs named by CMS36
Total drug cost$86,798
Part D patients279
Dr. Asch's Part D claims by kind of drug, 2024
- Generic1,692 claims92%
- Brand-name128 claims7%
- Other21 claims1%
Dr. Asch's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Asch's Part D claims, 2024
- Opioids1%14 of 1,841 claims
- Antibiotics6%114 of 1,841 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1,7112024: 1,5539%
Drugs named by CMS: 36 in 2024, 36 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Dr. William Stuart Asch scored 87 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 87 out of 100 for Dr. Asch for performance year 2024, reported as part of a group. Dr. Asch accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Asch as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Dr. Asch's MIPS scores, performance year 2024
- 87of 100Final score
- 77.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 74of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. William Stuart Asch has 26 publications on record
Dmand AI links 26 papers to Dr. Asch, published from 2011 to 2024. 2020 was the busiest year, with 3. The most frequent topics are Kidney Transplantation, Immunosuppressive Agents and Calcineurin Inhibitors. Dr. Asch has published most often in Am J Kidney Dis. Dr. Asch's most frequent co-authors are Margaret J. Bia, MD, Richard Nicholas Formica, MD and Sanjay Kulkarni, MD.
Papers26
Years published2011 to 2024
Dr. Asch's papers by year, 2011 to 2024
Topics Dr. Asch writes about most
- Kidney Transplantation
- Immunosuppressive Agents
- Calcineurin Inhibitors
- Graft Rejection
- Transplant Recipients
- Antifungal Agents
- BK Virus
- Carcinoma, Renal Cell
Dr. Asch's most frequent co-authors
- Margaret J. Bia, MD6 shared papers
- Richard Nicholas Formica, MD6 shared papers
- Sanjay Kulkarni, MD5 shared papers
Recent publications by Dr. Asch
COVID-19CytokinesImmunosuppressive Agents
See who Dr. Asch researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Asch works with, so you can find a warm path to the right nephrologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William Stuart Asch received $4,806 in industry payments from 2016 to 2021
CMS Open Payments shows 10 general payments to Dr. Asch from 4 drug and device companies from 2016 to 2021. Honoraria make up the largest share, 60% of the total. Horizon Pharma plc paid the most, $2,880.
General payments to Dr. Asch by program year, 2016 to 2021
General payments to Dr. Asch by kind, 2016 to 2021
$4.8Kin total
- Honoraria$2,88060%
- Travel and lodging$1,27126%
- Food and beverage$65514%
Companies that paid Dr. Asch the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Stuart Asch graduated from Stony Brook University Health Sciences Center School of Medicine
Dr. Asch graduated from Stony Brook University Health Sciences Center School of Medicine in 2001.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Stuart Asch's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Stuart Asch
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William Stuart Asch's NPI number?
Dr. William Stuart Asch's NPI number is 1003933326. It was assigned on March 23, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. William Stuart Asch?
Dr. William Stuart Asch is a nephrologist in New Haven, Connecticut. The primary specialty in the NPI Registry is Nephrology Physician (taxonomy code 207RN0300X).
Where does Dr. William Stuart Asch practice?
Dr. Asch practices at 20 York Street, New Haven, CT 06510. Dr. Asch's primary practice is Yale New Haven Psychiatric Hospital (York St) in New Haven, Connecticut. Dmand AI also links Dr. Asch to 4 hospitals and 1 medical group.
What is Dr. William Stuart Asch's office phone number?
The practice phone on file for Dr. Asch is (203) 688-5900.
What is Dr. William Stuart Asch's medical license number?
Dr. Asch holds Connecticut license 044496.
Which hospitals is Dr. William Stuart Asch affiliated with?
Dr. Asch is affiliated with Yale New Haven Hospital. Dmand AI links Dr. Asch to 4 more hospitals.
What medical group is Dr. William Stuart Asch part of?
Dr. Asch is linked to Yale Health. Dmand AI links Dr. Asch to 1 more medical group.
Does Dr. William Stuart Asch accept Medicare?
Yes. CMS data shows Dr. Asch billed Medicare for 560 services in 2024, and Dr. Asch accepts Medicare assignment.
Does Dr. William Stuart Asch offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Asch as offering telehealth services.
What is Dr. William Stuart Asch's MIPS score?
Dr. Asch's MIPS final score for performance year 2024 is 87 out of 100, reported as part of a group.
Show 8 more questionsShow fewer questions
How many Medicare patients does Dr. William Stuart Asch see?
CMS counts 228 Medicare patients who saw Dr. Asch in 2024, with an average age of 65.
What services does Dr. William Stuart Asch bill to Medicare?
In 2024, Dr. Asch's most billed Medicare services were hospital inpatient care (99232), office visit, established patient (99214) and hospital inpatient care (99222).
Where did Dr. William Stuart Asch go to medical school?
Dr. Asch graduated from Stony Brook University Health Sciences Center School of Medicine in 2001.
What drugs does Dr. William Stuart Asch prescribe most?
In 2024 Medicare Part D data, Dr. Asch's most prescribed drugs by claims were Prednisone, Amlodipine Besylate and Carvedilol.
Has Dr. William Stuart Asch received payments from drug or device companies?
CMS Open Payments shows $4,806 in general payments to Dr. Asch from 4 companies from 2016 to 2021. The largest total came from Horizon Pharma plc.
How long has Dr. William Stuart Asch been practicing?
Dr. Asch graduated from medical school in 2001, 25 years ago.
Does Dr. William Stuart Asch do research?
Dmand AI links 26 publications to Dr. Asch, published from 2011 to 2024.
Who does Dr. William Stuart Asch publish with?
Dr. Asch's most frequent co-authors are Margaret J. Bia, MD (6 shared papers), Richard Nicholas Formica, MD (6 shared papers) and Sanjay Kulkarni, MD (5 shared papers).
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