William T. Larsen
- Medicare patients, 2024
- 83
- Part D claims, 2024
- 54
- Hospital affiliations
- 5
- Medical groups
- 4
- State license
- 1
- Practice address
- 800 Biesterfield Rd, Elk Grove Village, IL 60007
- Practice phone
- Call (847) 437-5500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find William Larsen'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.
William T. Larsen is a physician assistant in Elk Grove Village, Illinois
William Larsen practices at Ascension Alexian Brothers in Elk Grove Village, Illinois, part of Ascension Health Alliance.
William Larsen's NPI, 1356711584, was assigned on September 30, 2015. William Larsen holds Illinois license 085005642.
- NPI
- 1356711584NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9537469846
- NPI enumeration date
- September 30, 2015
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (847) 437-5500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 37
- Medical school graduation
- 2015
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
William T. Larsen practices at Ascension Alexian Brothers in Elk Grove Village, Illinois
William Larsen's primary practice is Ascension Alexian Brothers, at 800 Biesterfield Rd, Elk Grove Village, IL 60007 in Cook County. The practice phone is (847) 437-5500.
- Ascension Alexian Brothers800 Biesterfield Rd, Elk Grove Village, IL 60007 · Cook CountyPhone(847) 437-5500
Source: Dmand AI Affiliation Data
William T. Larsen is affiliated with 5 sites of care and 4 medical groups
William Larsen's primary practice is Ascension Alexian Brothers in Elk Grove Village, Illinois, part of Ascension Health Alliance. William Larsen is also affiliated with University of Chicago Medical Center. The medical group on file is UChicago Medicine Physicians (University of Chicago Physicians Group). Dmand AI also links William Larsen to 3 more hospitals and 3 medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at William T. Larsen's practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Larsen practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Ascension Alexian Brothers | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Ascension Health Alliance and 6.2K+ hospitals, with verified contacts in the same login.
William T. Larsen is one of 543 physician assistants in Illinois
Medical is William Larsen's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. William Larsen is licensed in Illinois.
Specialties and state licenses
- Medical physician assistant, IllinoisPrimary
Physician assistants near William Larsen
Counts of physician assistants 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
William T. Larsen treated 83 Medicare patients in 2024, average age 77
CMS counts 83 Medicare patients who saw William Larsen in 2024. The largest group is 75 to 84, with 27 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 17% are also on Medicaid. Their average risk score is 1.87, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts William Larsen's median patient age at 73, with 55% women.
William Larsen's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
William Larsen's Medicare patients by sex, 2024
- Women4959%
- Men3441%
Chronic conditions among William Larsen's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis71%
- Stroke or TIA59%
- Ischemic heart disease52%
- Chronic kidney disease48%
- Heart failure47%
- Mood disorders47%
Share of Medicare patients with each condition. A patient can have several.
William Larsen's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 73
Patient panel by sex, all payers
- Women55%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
William T. Larsen wrote 54 Medicare Part D claims in 2024
In 2024, William Larsen wrote 54 Medicare Part D claims for 28 patients. 74% of them were for generic drugs.
William Larsen's Part D claims by kind of drug, 2024
- Generic40 claims74%
- Brand-name and other14 claims26%
Drug classes CMS tracks in William Larsen's Part D claims, 2024
- Opioids39%21 of 54 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How William T. Larsen takes part in Medicare
William Larsen accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Sources for William T. Larsen'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) |
| Part D prescribing | 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) |
| 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 William T. Larsen
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is William T. Larsen's NPI number?
William T. Larsen's NPI number is 1356711584. It was assigned on September 30, 2015, and it is active in the NPI Registry.
What does William T. Larsen specialize in?
William T. Larsen is a physician assistant in Elk Grove Village, Illinois. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).
Where does William T. Larsen practice?
William Larsen practices at 800 Biesterfield Rd, Elk Grove Village, IL 60007. William Larsen's primary practice is Ascension Alexian Brothers in Elk Grove Village, Illinois, part of Ascension Health Alliance. Dmand AI also links William Larsen to 3 hospitals and 3 medical groups.
What is William T. Larsen's office phone number?
The practice phone on file for William Larsen is (847) 437-5500.
What is William T. Larsen's medical license number?
William Larsen holds Illinois license 085005642.
Which hospitals is William T. Larsen affiliated with?
William Larsen practices at Ascension Alexian Brothers in Elk Grove Village, Illinois. William Larsen is also affiliated with University of Chicago Medical Center. Dmand AI links William Larsen to 3 more hospitals.
What medical group is William T. Larsen part of?
William Larsen is linked to UChicago Medicine Physicians (University of Chicago Physicians Group). Dmand AI links William Larsen to 3 more medical groups.
Does William T. Larsen accept Medicare?
Yes. CMS lists William Larsen as accepting Medicare assignment.
How many Medicare patients does William T. Larsen see?
CMS counts 83 Medicare patients who saw William Larsen in 2024, with an average age of 77.
How long has William T. Larsen been practicing?
William Larsen graduated from medical school in 2015, 11 years ago.
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