Dr. Willaim J. Sierraalta, MD
- Medicare patients, 2024
- 47
- MIPS score, 2024
- 95
- Hospital affiliations
- 2
- Industry payments
- $113
- Medical group
- 1
- Practice address
- 300 Randall Rd, Geneva, IL 60134
- Practice phone
- Call (630) 208-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Sierraalta's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Willaim J. Sierraalta is a general surgeon in Geneva, Illinois
Dr. Sierraalta practices at Northwestern Medicine Delnor Hospital in Geneva, Illinois, part of Northwestern Memorial HealthCare.
Dr. Sierraalta's NPI, 1932761483, was assigned on July 5, 2019. Dr. Sierraalta holds Pennsylvania license MT219417.
- NPI
- 1932761483NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7012246614
- NPI enumeration date
- July 5, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (630) 208-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 40
- Medical school graduation
- 2012
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Willaim J. Sierraalta practices at Northwestern Medicine Delnor Hospital in Geneva, Illinois
Dr. Sierraalta's primary practice is Northwestern Medicine Delnor Hospital, at 300 Randall Rd, Geneva, IL 60134 in Kane County. The practice phone is (630) 208-3000.
- Northwestern Medicine Delnor Hospital300 Randall Rd, Geneva, IL 60134 · Kane CountyPhone(630) 208-3000
Source: Dmand AI Affiliation Data
Dr. Willaim J. Sierraalta is affiliated with 3 sites of care and 1 medical group
Dr. Sierraalta's primary practice is Northwestern Medicine Delnor Hospital in Geneva, Illinois, part of Northwestern Memorial HealthCare. Dr. Sierraalta is also affiliated with Northwestern Medicine Central DuPage Hospital. The medical group on file is Northwestern Medical Faculty Foundation. Dmand AI also links Dr. Sierraalta to 1 more group practice or clinic, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Willaim J. Sierraalta's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sierraalta practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Northwestern Medicine Delnor Hospital | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dmand AI maps EHR vendors, IT decision makers and buying committees across Northwestern Memorial HealthCare and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Willaim J. Sierraalta is one of 1,217 general surgeons in Illinois
Surgery is Dr. Sierraalta's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dmand AI has Dr. Sierraalta's licenses on file in 2 states: Pennsylvania and Illinois.
Specialties and state licenses
- Surgery, PennsylvaniaPrimary
- Anesthesiology, Illinois
General surgeons near Dr. Sierraalta
Counts of general surgeons 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. Willaim J. Sierraalta treated 47 Medicare patients in 2024, average age 77
CMS counts 47 Medicare patients who saw Dr. Sierraalta in 2024. The largest group is 75 to 84, with 21 patients. 75% of them have high cholesterol, and 68% have high blood pressure. Their average risk score is 1.38, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Sierraalta's median patient age at 63, with 50% women.
Dr. Sierraalta's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Sierraalta's Medicare patients by sex, 2024
- Women2553%
- Men2247%
Chronic conditions among Dr. Sierraalta's Medicare patients, 2024
- High cholesterol75%
- High blood pressure68%
- Arthritis49%
- Atrial fibrillation36%
- Cancer34%
- Ischemic heart disease32%
- Mood disorders28%
- Anxiety26%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sierraalta's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 63
Patient panel by sex, all payers
- Women50%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Willaim J. Sierraalta scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Sierraalta for performance year 2024, reported through an alternative payment model (APM). Dr. Sierraalta accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Sierraalta's MIPS scores, performance year 2024
- 95of 100Final score
- 83of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
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
Dr. Willaim J. Sierraalta received $113 in industry payments in 2021
CMS Open Payments shows 1 general payment to Dr. Sierraalta from 1 drug or device company in 2021. Food and beverage make up the largest share, 100% of the total. Acacia Pharma Inc paid the most, $113.
Companies that paid Dr. Sierraalta the most, 2021 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. Willaim J. Sierraalta'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 patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - 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) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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. Willaim J. Sierraalta
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. Willaim J. Sierraalta's NPI number?
Dr. Willaim J. Sierraalta's NPI number is 1932761483. It was assigned on July 5, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Willaim J. Sierraalta?
Dr. Willaim J. Sierraalta is a general surgeon in Geneva, Illinois. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Willaim J. Sierraalta practice?
Dr. Sierraalta practices at 300 Randall Rd, Geneva, IL 60134. Dr. Sierraalta's primary practice is Northwestern Medicine Delnor Hospital in Geneva, Illinois, part of Northwestern Memorial HealthCare. Dmand AI also links Dr. Sierraalta to 1 group practice or clinic.
What is Dr. Willaim J. Sierraalta's office phone number?
The practice phone on file for Dr. Sierraalta is (630) 208-3000.
What is Dr. Willaim J. Sierraalta's medical license number?
Dr. Sierraalta holds Pennsylvania license MT219417, one of the licenses on file in 2 states.
Which states has Dr. Willaim J. Sierraalta been licensed in?
Dmand AI has state licenses on file for Dr. Sierraalta in Pennsylvania and Illinois.
Which hospitals is Dr. Willaim J. Sierraalta affiliated with?
Dr. Sierraalta practices at Northwestern Medicine Delnor Hospital in Geneva, Illinois. Dr. Sierraalta is also affiliated with Northwestern Medicine Central DuPage Hospital.
What medical group is Dr. Willaim J. Sierraalta part of?
Dr. Sierraalta is linked to Northwestern Medical Faculty Foundation.
Does Dr. Willaim J. Sierraalta accept Medicare?
Yes. CMS lists Dr. Sierraalta as accepting Medicare assignment.
What is Dr. Willaim J. Sierraalta's MIPS score?
Dr. Sierraalta's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
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How many Medicare patients does Dr. Willaim J. Sierraalta see?
CMS counts 47 Medicare patients who saw Dr. Sierraalta in 2024, with an average age of 77.
Has Dr. Willaim J. Sierraalta received payments from drug or device companies?
CMS Open Payments shows $113 in general payments to Dr. Sierraalta from 1 company from 2021 to 2021. The largest total came from Acacia Pharma Inc.
How long has Dr. Willaim J. Sierraalta been practicing?
Dr. Sierraalta graduated from medical school in 2012, 14 years ago.
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