Dr. William K. Imsais, MD
- Medicare services, 2024
- 129
- Medicare patients, 2024
- 145
- Part D claims, 2019
- 12
- MIPS score, 2024
- 94
- Hospital affiliations
- 2
- Practice address
- 4502 Medical Dr, San Antonio, TX 78229
- Practice phone
- Call (210) 358-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital (San Antonio)
San Antonio, Texas
Find Dr. Imsais' 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. William K. Imsais is an internist in San Antonio, Texas
Dr. Imsais practices at University Hospital (San Antonio) in San Antonio, Texas.
Dr. Imsais' NPI, 1770548349, was assigned on April 18, 2006. Dr. Imsais holds Louisiana license MD026039.
- NPI
- 1770548349NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2567416373
- NPI enumeration date
- April 18, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (210) 358-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 50
- Medical school graduation
- 2002
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. William K. Imsais practices at University Hospital (San Antonio) in San Antonio, Texas
Dr. Imsais' primary practice is University Hospital (San Antonio), at 4502 Medical Dr, San Antonio, TX 78229 in Bexar County. The practice phone is (210) 358-4000.
- University Hospital (San Antonio)4502 Medical Dr, San Antonio, TX 78229 · Bexar CountyPhone(210) 358-4000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. William K. Imsais is affiliated with 3 sites of care and 6 medical groups
Dr. Imsais' primary practice is University Hospital (San Antonio) in San Antonio, Texas. Dr. Imsais is also affiliated with University Hospital. The medical group on file is UT Health Physicians. Dmand AI also links Dr. Imsais to 1 more hospital and 5 medical groups, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William K. Imsais' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Imsais practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| University Hospital (San Antonio) | Available with a free account |
| +2 more sites and 5 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William K. Imsais is one of 8,437 internists in Texas
Internal medicine is Dr. Imsais' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Imsais' licenses on file in 2 states: Louisiana and Texas.
Specialties and state licenses
- Internal medicine, LouisianaPrimary
- Emergency medicine, Texas
Internists near Dr. Imsais
Counts of internists 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 K. Imsais billed Medicare for 129 services in 2024
CMS data shows 129 Medicare services from Dr. Imsais across 2 procedure codes in 2024, for 145 Medicare patients. Medicare paid $16,959 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Imsais' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2712024: 12952%
Dr. Imsais compared with the Texas median for internists, 2024
- Dr. Imsais
- Texas median
- Medicare services
- 129vs 53976% below
- Medicare patients
- 145vs 19024% below
- Part D claims
- 12vs 28996% below
Medians across 7,794 internists in Texas with Dmand AI profiles that report each measure.
Dr. Imsais' 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. Imsais?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Imsais and other internists in Texas.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William K. Imsais treated 145 Medicare patients in 2024, average age 70
CMS counts 145 Medicare patients who saw Dr. Imsais in 2024. The largest group is 65 to 74, with 45 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 34% are also on Medicaid. Their average risk score is 2.74, 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. Imsais' median patient age at 59, with 52% women.
Dr. Imsais' Medicare patients by age, 2024
Dr. Imsais' Medicare patients by sex, 2024
- Women6948%
- Men7652%
Chronic conditions among Dr. Imsais' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Diabetes54%
- Chronic kidney disease52%
- Mood disorders51%
- Depression47%
- Arthritis44%
- Ischemic heart disease44%
Share of Medicare patients with each condition. A patient can have several.
Dr. Imsais' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 59
Patient panel by sex, all payers
- Women52%
- Men48%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William K. Imsais wrote 12 Medicare Part D claims in 2019
In 2019, Dr. Imsais wrote 12 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $3,639 in total drug cost.
Dr. Imsais' most prescribed drugs by claims, 2019
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
Dr. William K. Imsais scored 94 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 94 out of 100 for Dr. Imsais for performance year 2024, reported as part of a group. Dr. Imsais accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Imsais' MIPS scores, performance year 2024
- 94of 100Final score
- 81.1of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 72of 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 K. Imsais received $58 in industry payments from 2020 to 2022
CMS Open Payments shows 3 general payments to Dr. Imsais from 2 drug and device companies from 2020 to 2022. Food and beverage make up the largest share, 100% of the total. C. R. Bard, Inc. & Subsidiaries paid the most, $40.
General payments to Dr. Imsais by program year, 2020 to 2022
Companies that paid Dr. Imsais the most, 2020 to 2022
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William K. Imsais'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand 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) |
| 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. William K. Imsais
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 K. Imsais' NPI number?
Dr. William K. Imsais' NPI number is 1770548349. It was assigned on April 18, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William K. Imsais?
Dr. William K. Imsais is an internist in San Antonio, Texas. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. William K. Imsais practice?
Dr. Imsais practices at 4502 Medical Dr, San Antonio, TX 78229. Dr. Imsais' primary practice is University Hospital (San Antonio) in San Antonio, Texas. Dmand AI also links Dr. Imsais to 1 hospital and 5 medical groups.
What is Dr. William K. Imsais' office phone number?
The practice phone on file for Dr. Imsais is (210) 358-4000.
What is Dr. William K. Imsais' medical license number?
Dr. Imsais holds Louisiana license MD026039, one of the licenses on file in 2 states.
Which states has Dr. William K. Imsais been licensed in?
Dmand AI has state licenses on file for Dr. Imsais in Louisiana and Texas.
Which hospitals is Dr. William K. Imsais affiliated with?
Dr. Imsais is affiliated with University Hospital. Dmand AI links Dr. Imsais to 1 more hospital.
What medical group is Dr. William K. Imsais part of?
Dr. Imsais is linked to UT Health Physicians. Dmand AI links Dr. Imsais to 5 more medical groups.
Does Dr. William K. Imsais accept Medicare?
Yes. CMS data shows Dr. Imsais billed Medicare for 129 services in 2024, and Dr. Imsais accepts Medicare assignment.
What is Dr. William K. Imsais' MIPS score?
Dr. Imsais' MIPS final score for performance year 2024 is 94 out of 100, reported as part of a group.
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How many Medicare patients does Dr. William K. Imsais see?
CMS counts 145 Medicare patients who saw Dr. Imsais in 2024, with an average age of 70.
What services does Dr. William K. Imsais bill to Medicare?
In 2024, Dr. Imsais' most billed Medicare services were emergency department visit (99285) and emergency department visit (99284).
What drugs does Dr. William K. Imsais prescribe most?
In 2019 Medicare Part D data, Dr. Imsais' most prescribed drugs by claims were Ampicillin Sodium.
Has Dr. William K. Imsais received payments from drug or device companies?
CMS Open Payments shows $58 in general payments to Dr. Imsais from 2 companies from 2020 to 2022. The largest total came from C. R. Bard, Inc. & Subsidiaries.
How long has Dr. William K. Imsais been practicing?
Dr. Imsais graduated from medical school in 2002, 24 years ago.
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