Dr. Mark Wayne Williams Sr., MD, PhD
- Medicare services, 2024
- 80
- Medicare patients, 2024
- 102
- Part D claims, 2024
- 89
- Hospital affiliations
- 2
- Industry payments
- $1,925
- Practice address
- 1518 Mulberry Avenue, Muscatine, IA 52761
- Practice phone
- Call (563) 264-9100
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Williams' 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. Mark Wayne Williams Sr. is a general surgeon in Muscatine, Iowa
Dr. Williams practices at UnityPoint Health -Trinity Muscatine Hospital in Muscatine, Iowa, part of UnityPoint Health.
Dr. Williams' NPI, 1417986001, was assigned on July 3, 2006. Dr. Williams graduated from University of North Carolina at Chapel Hill School of Medicine in 2000. Dr. Williams holds South Carolina license TL25609.
- NPI
- 1417986001NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9638182314
- NPI enumeration date
- July 3, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (563) 264-9100
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark Wayne Williams Sr. practices at UnityPoint Health -Trinity Muscatine Hospital in Muscatine, Iowa
Dr. Williams' primary practice is UnityPoint Health -Trinity Muscatine Hospital, at 1518 Mulberry Avenue, Muscatine, IA 52761 in Muscatine County. The practice phone is (563) 264-9100.
- UnityPoint Health -Trinity Muscatine Hospital1518 Mulberry Avenue, Muscatine, IA 52761 · Muscatine CountyPhone(563) 264-9100
Source: Dmand AI Affiliation Data
Dr. Mark Wayne Williams Sr. is affiliated with 3 sites of care and 2 medical groups
Dr. Williams' primary practice is UnityPoint Health -Trinity Muscatine Hospital in Muscatine, Iowa, part of UnityPoint Health. Dr. Williams is also affiliated with UnityPoint Health - Trinity Rock Island. The medical group on file is UnityPoint Clinic. Dmand AI also links Dr. Williams to 1 more home health agency and 1 medical group, each named with a free account. Dr. Williams' employer is on file too: a hospital.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark Wayne Williams Sr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| UnityPoint Health -Trinity Muscatine Hospital | Available with a free account |
| +2 more sites and 1 medical group | 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 UnityPoint Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Mark Wayne Williams Sr. is one of 317 general surgeons in Iowa
Surgery is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Williams is licensed in South Carolina.
Specialties and state licenses
- Surgery, South CarolinaPrimary
General surgeons near Dr. Williams
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. Mark Wayne Williams Sr. billed Medicare for 80 services in 2024
CMS data shows 80 Medicare services from Dr. Williams across 5 procedure codes in 2024, for 102 Medicare patients. Medicare paid $9,342 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 192024: 38100%
- Surgery
- 2023: 02024: 27
- Other services
- 2023: 02024: 15
Dr. Williams compared with the Iowa median for general surgeons, 2024
- Dr. Williams
- Iowa median
- Medicare services
- 80vs 16451% below
- Medicare patients
- 102vs 14630% below
- Part D claims
- 45vs 43Close to median
Medians across 332 general surgeons in Iowa with Dmand AI profiles that report each measure.
Dr. Williams' 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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other general surgeons in Iowa.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Mark Wayne Williams Sr. treated 102 Medicare patients in 2024, average age 72
CMS counts 102 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 58 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 11% are also on Medicaid. Their average risk score is 1.40, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 71, with 46% women.
Dr. Williams' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Williams' Medicare patients by sex, 2024
- Women5049%
- Men5251%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Mood disorders32%
- Depression31%
- Diabetes30%
- Chronic kidney disease27%
- Ischemic heart disease25%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 71
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark Wayne Williams Sr. wrote 89 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 89 Medicare Part D claims for 72 patients. 90% of them were for generic drugs. CMS names the drug for 45 of them, across 2 drugs with 11 or more claims each, at $197 in total drug cost. In 2023, CMS named 30 claims across 1 drug.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic80 claims90%
- Brand-name and other9 claims10%
Dr. Williams' 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. Williams' Part D claims, 2024
- Opioids53%47 of 89 claims
- Antibiotics20%18 of 89 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: 302024: 4550%
Drugs named by CMS: 2 in 2024, 1 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. Mark Wayne Williams Sr. ranks in the 68th percentile for colonoscopy in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 61 procedures of colonoscopy by Dr. Williams, more than 68% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Williams ranks in Medicare procedure volume
- Colonoscopy
- 68th percentile61 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Hernia repair (minimally invasive): 1 to 10 procedures (CMS shows small counts as a range)
Hernia repair - groin (open): 1 to 10 procedures (CMS shows small counts as a range)
Melanoma (skin cancer) excision: 1 to 10 procedures (CMS shows small counts as a range)
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Upper gastrointestinal (GI) endoscopy for acid reflux: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Mark Wayne Williams Sr. received $1,925 in industry payments from 2016 to 2025
CMS Open Payments shows 10 general payments to Dr. Williams from 2 drug and device companies from 2016 to 2025. Travel and lodging make up the largest share, 58% of the total. Davol Inc. paid the most, $1,813.
General payments to Dr. Williams by program year, 2016 to 2025
General payments to Dr. Williams by kind, 2016 to 2025
- Travel and lodging$1,12358%
- Food and beverage$78341%
- Education$191%
Companies that paid Dr. Williams the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Mark Wayne Williams Sr. graduated from University of North Carolina at Chapel Hill School of Medicine
Dr. Williams graduated from University of North Carolina at Chapel Hill School of Medicine in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark Wayne Williams Sr.'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)Doctors and Clinicians Utilization Data (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. Mark Wayne Williams Sr.
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. Mark Wayne Williams Sr.'s NPI number?
Dr. Mark Wayne Williams Sr.'s NPI number is 1417986001. It was assigned on July 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark Wayne Williams Sr.?
Dr. Mark Wayne Williams Sr. is a general surgeon in Muscatine, Iowa. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Mark Wayne Williams Sr. practice?
Dr. Williams practices at 1518 Mulberry Avenue, Muscatine, IA 52761. Dr. Williams' primary practice is UnityPoint Health -Trinity Muscatine Hospital in Muscatine, Iowa, part of UnityPoint Health. Dmand AI also links Dr. Williams to 1 home health agency and 1 medical group.
What is Dr. Mark Wayne Williams Sr.'s office phone number?
The practice phone on file for Dr. Williams is (563) 264-9100.
What is Dr. Mark Wayne Williams Sr.'s medical license number?
Dr. Williams holds South Carolina license TL25609.
Which hospitals is Dr. Mark Wayne Williams Sr. affiliated with?
Dr. Williams practices at UnityPoint Health -Trinity Muscatine Hospital in Muscatine, Iowa. Dr. Williams is also affiliated with UnityPoint Health - Trinity Rock Island.
What medical group is Dr. Mark Wayne Williams Sr. part of?
Dr. Williams is linked to UnityPoint Clinic. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Mark Wayne Williams Sr. accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 80 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Mark Wayne Williams Sr. see?
CMS counts 102 Medicare patients who saw Dr. Williams in 2024, with an average age of 72.
What services does Dr. Mark Wayne Williams Sr. bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were hospital inpatient care (99232), hospital inpatient care (99222) and medicare service (G0121).
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Where did Dr. Mark Wayne Williams Sr. go to medical school?
Dr. Williams graduated from University of North Carolina at Chapel Hill School of Medicine in 2000.
What drugs does Dr. Mark Wayne Williams Sr. prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Hydrocodone-Acetaminophen and Tramadol HCl.
Has Dr. Mark Wayne Williams Sr. received payments from drug or device companies?
CMS Open Payments shows $1,925 in general payments to Dr. Williams from 2 companies from 2016 to 2025. The largest total came from Davol Inc.
How long has Dr. Mark Wayne Williams Sr. been practicing?
Dr. Williams graduated from medical school in 2000, 26 years ago.
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