Dr. William Sprague Trask IV, DO
- Medicare services, 2024
- 135
- Medicare patients, 2024
- 218
- Hospital affiliations
- 1
- Industry payments
- $23
- Medical group
- 1
- Practice address
- 4747 Arapahoe Avenue, Boulder, CO 80304
- Practice phone
- Call (303) 440-2273
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. William Sprague Trask IV is an anesthesiologist in Boulder, Colorado
Dr. Trask practices at Foothills Hospital in Boulder, Colorado, part of Boulder Community Health.
Dr. Trask's NPI, 1184706608, was assigned on October 20, 2006. Dr. Trask graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2006. Dr. Trask holds Colorado license 49491.
- NPI
- 1184706608NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638294630
- NPI enumeration date
- October 20, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (303) 440-2273
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William Sprague Trask IV practices at Foothills Hospital in Boulder, Colorado
Dr. Trask's primary practice is Foothills Hospital, at 4747 Arapahoe Avenue, Boulder, CO 80304 in Boulder County. The practice phone is (303) 440-2273.
- Foothills Hospital4747 Arapahoe Avenue, Boulder, CO 80304 · Boulder CountyPhone(303) 440-2273
Source: Dmand AI Affiliation Data
Dr. William Sprague Trask IV is affiliated with 1 site of care and 1 medical group
Dr. Trask's primary practice is Foothills Hospital in Boulder, Colorado, part of Boulder Community Health. The medical group on file is Boulder Valley Anesthesiology.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William Sprague Trask IV's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Trask practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Foothills Hospital | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Sprague Trask IV is one of 1,032 anesthesiologists in Colorado
Anesthesiology is Dr. Trask's primary specialty in the NPI Registry, under taxonomy code 207L00000X. Dmand AI has Dr. Trask's licenses on file in 2 states: Colorado and Washington.
Specialties and state licenses
- Anesthesiology, ColoradoPrimary
- Washington license
Anesthesiologists near Dr. Trask
Counts of anesthesiologists 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 Sprague Trask IV billed Medicare for 135 services in 2024
CMS data shows 135 Medicare services from Dr. Trask across 3 procedure codes in 2024, for 218 Medicare patients. Medicare paid $13,878 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Trask's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Anesthesia
- 2023: 1392024: 10425%
- Surgery
- 2023: 272024: 3115%
Dr. Trask compared with the Colorado median for anesthesiologists, 2024
- Dr. Trask
- Colorado median
- Medicare services
- 135vs 532.5 times
- Medicare patients
- 218vs 12673% above
Medians across 977 anesthesiologists in Colorado with Dmand AI profiles that report each measure.
Dr. Trask'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.
Need commercial claims for Dr. Trask?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Trask and other anesthesiologists in Colorado.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Sprague Trask IV treated 218 Medicare patients in 2024, average age 74
CMS counts 218 Medicare patients who saw Dr. Trask in 2024. The largest group is 65 to 74, with 116 patients. 64% of them have high cholesterol, and 57% have arthritis. Their average risk score is 0.93, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Trask's median patient age at 62, with 56% women.
Dr. Trask's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Trask's Medicare patients by sex, 2024
- Women13160%
- Men8740%
Chronic conditions among Dr. Trask's Medicare patients, 2024
- High cholesterol64%
- Arthritis57%
- High blood pressure57%
- Ischemic heart disease27%
- Atrial fibrillation19%
- Mood disorders19%
- Osteoporosis19%
- Anxiety17%
Share of Medicare patients with each condition. A patient can have several.
Dr. Trask's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 62
Patient panel by sex, all payers
- Women56%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
How Dr. William Sprague Trask IV takes part in Medicare
Dr. Trask 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)
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Dr. William Sprague Trask IV received $23 in industry payments in 2016
CMS Open Payments shows 2 general payments to Dr. Trask from 2 drug and device companies in 2016. Food and beverage make up the largest share, 100% of the total. St. Jude Medical, Inc. paid the most, $13.
Companies that paid Dr. Trask the most, 2016 to 2016
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William Sprague Trask IV graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville
Dr. Trask graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2006.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. William Sprague Trask IV'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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Sprague Trask IV
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 Sprague Trask IV's NPI number?
Dr. William Sprague Trask IV's NPI number is 1184706608. It was assigned on October 20, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William Sprague Trask IV?
Dr. William Sprague Trask IV is an anesthesiologist in Boulder, Colorado. The primary specialty in the NPI Registry is Anesthesiology Physician (taxonomy code 207L00000X).
Where does Dr. William Sprague Trask IV practice?
Dr. Trask practices at 4747 Arapahoe Avenue, Boulder, CO 80304. Dr. Trask's primary practice is Foothills Hospital in Boulder, Colorado, part of Boulder Community Health.
What is Dr. William Sprague Trask IV's office phone number?
The practice phone on file for Dr. Trask is (303) 440-2273.
What is Dr. William Sprague Trask IV's medical license number?
Dr. Trask holds Colorado license 49491, one of the licenses on file in 2 states.
Which states has Dr. William Sprague Trask IV been licensed in?
Dmand AI has state licenses on file for Dr. Trask in Colorado and Washington.
Which hospitals is Dr. William Sprague Trask IV affiliated with?
Dr. Trask practices at Foothills Hospital in Boulder, Colorado.
What medical group is Dr. William Sprague Trask IV part of?
Dr. Trask is linked to Boulder Valley Anesthesiology.
Does Dr. William Sprague Trask IV accept Medicare?
Yes. CMS data shows Dr. Trask billed Medicare for 135 services in 2024, and Dr. Trask accepts Medicare assignment.
How many Medicare patients does Dr. William Sprague Trask IV see?
CMS counts 218 Medicare patients who saw Dr. Trask in 2024, with an average age of 74.
Show 4 more questionsShow fewer questions
What services does Dr. William Sprague Trask IV bill to Medicare?
In 2024, Dr. Trask's most billed Medicare services were anesthesia (00142), surgery: brain, spine and nerves (64447) and anesthesia (01402).
Where did Dr. William Sprague Trask IV go to medical school?
Dr. Trask graduated from At Still University of Health Sciences, College of Osteo Med, Kirksville in 2006.
Has Dr. William Sprague Trask IV received payments from drug or device companies?
CMS Open Payments shows $23 in general payments to Dr. Trask from 2 companies from 2016 to 2016. The largest total came from St. Jude Medical, Inc.
How long has Dr. William Sprague Trask IV been practicing?
Dr. Trask graduated from medical school in 2006, 20 years ago.
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