Dr. Michael D. Williams, MD
- Medicare services, 2024
- 20,545
- Medicare patients, 2024
- 719
- Part D claims, 2024
- 964
- Hospital affiliations
- 2
- Industry payments
- $53,533
- Practice address
- 208 Portland Street, Columbia, MO 65201
- Practice phone
- Call (573) 449-3500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Columbia Endoscopy Center
Surgery Center - Medicare-Certified · Columbia, Missouri
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Michael D. Williams is a gastroenterologist in Columbia, Missouri
Dr. Williams practices at Columbia Endoscopy Center in Columbia, Missouri.
Dr. Williams' NPI, 1750334470, was assigned on May 17, 2006. Dr. Williams graduated from University of Missouri, Columbia School of Medicine in 2003. Dr. Williams holds Missouri license 2017008968.
- NPI
- 1750334470NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2769495514
- NPI enumeration date
- May 17, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (573) 449-3500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Michael D. Williams practices at Columbia Endoscopy Center in Columbia, Missouri
Dr. Williams' primary practice is Columbia Endoscopy Center, at 208 Portland Street, Columbia, MO 65201. The practice phone is (573) 449-3500.
- Columbia Endoscopy Center208 Portland Street, Columbia, MO 65201Phone(573) 449-3500
Source: Dmand AI Affiliation Data
Dr. Michael D. Williams is affiliated with 5 sites of care and 3 medical groups
Dr. Williams' primary practice is Columbia Endoscopy Center in Columbia, Missouri. Dr. Williams is also affiliated with University Hospital. The medical group on file is Boone Health Medical Group. Dmand AI also links Dr. Williams to 1 more hospital, 2 group practices and clinics and 2 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 Dr. Michael D. Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Columbia Endoscopy Center | Available with a free account |
| +4 more sites and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Michael D. Williams is one of 329 gastroenterologists in Missouri
Gastroenterology is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Williams is licensed in Missouri.
Specialties and state licenses
- Gastroenterology, MissouriPrimary
Gastroenterologists near Dr. Williams
Counts of gastroenterologists 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. Michael D. Williams billed Medicare for 20,545 services in 2024
CMS data shows 20,545 Medicare services from Dr. Williams across 19 procedure codes in 2024, for 719 Medicare patients. Medicare paid $498,205 for them.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 20,4002024: 17,40015%
- Lab and pathology
- 2023: 8342024: 1,39067%
- Office and hospital visits
- 2023: 9192024: 81212%
- Surgery
- 2023: 4932024: 80663%
- Tests and treatments
- 2023: 1142024: 1131%
- Other services
- 2023: 112024: 24118%
Where Dr. Williams' Medicare services took place, 2024
- In an office19,71596%
- In a facility8304%
Dr. Williams compared with the Missouri median for gastroenterologists, 2024
- Dr. Williams
- Missouri median
- Medicare services
- 20,545vs 41649.4 times
- Medicare patients
- 719vs 2962.4 times
- Part D claims
- 807vs 43486% above
Medians across 337 gastroenterologists in Missouri 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 gastroenterologists in Missouri.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Michael D. Williams treated 719 Medicare patients in 2024, average age 73
CMS counts 719 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 387 patients. 74% of them have high cholesterol, and 73% have high blood pressure. 5% are also on Medicaid. Their average risk score is 1.13, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 63, with 58% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women40056%
- Men31944%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High cholesterol74%
- High blood pressure73%
- Arthritis52%
- Diabetes27%
- Ischemic heart disease24%
- Mood disorders24%
- Depression23%
- Anxiety22%
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 63
Patient panel by sex, all payers
- Women58%
- Men42%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Michael D. Williams wrote 964 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 964 Medicare Part D claims for 253 patients. 85% of them were for generic drugs. CMS names the drug for 807 of them, across 18 drugs with 11 or more claims each, at $72,019 in total drug cost. In 2023, CMS named 686 claims across 16 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic823 claims85%
- Brand-name141 claims15%
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
- Antibiotics2%24 of 964 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: 6862024: 80718%
Drugs named by CMS: 18 in 2024, 16 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. Michael D. Williams ranks in the 93rd percentile for upper gastrointestinal (gi) endoscopy for acid reflux in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 243 procedures of upper gastrointestinal (gi) endoscopy for acid reflux by Dr. Williams, more than 93% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Williams ranks in Medicare procedure volume
- Upper gastrointestinal (GI) endoscopy for acid reflux
- 93rd percentile243 procedures
- Colonoscopy
- 92nd percentile180 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Michael D. Williams received $53,533 in industry payments from 2016 to 2025
CMS Open Payments shows 818 general payments to Dr. Williams from 45 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 64% of the total. Phathom Pharmaceuticals, Inc. paid the most, $39,543.
General payments to Dr. Williams by program year, 2016 to 2025
General payments to Dr. Williams by kind, 2016 to 2025
- Speaker and faculty fees$34,40064%
- Food and beverage$15,49929%
- Travel and lodging$3,3686%
- Consulting fees$1500%
- Education$1160%
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. Michael D. Williams graduated from University of Missouri, Columbia School of Medicine
Dr. Williams graduated from University of Missouri, Columbia School of Medicine in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Michael D. Williams'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. Michael D. Williams
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. Michael D. Williams' NPI number?
Dr. Michael D. Williams' NPI number is 1750334470. It was assigned on May 17, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Michael D. Williams?
Dr. Michael D. Williams is a gastroenterologist in Columbia, Missouri. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Michael D. Williams practice?
Dr. Williams practices at 208 Portland Street, Columbia, MO 65201. Dr. Williams' primary practice is Columbia Endoscopy Center in Columbia, Missouri. Dmand AI also links Dr. Williams to 1 hospital, 2 group practices and clinics and 2 medical groups.
What is Dr. Michael D. Williams' office phone number?
The practice phone on file for Dr. Williams is (573) 449-3500.
What is Dr. Michael D. Williams' medical license number?
Dr. Williams holds Missouri license 2017008968.
Which hospitals is Dr. Michael D. Williams affiliated with?
Dr. Williams is affiliated with University Hospital. Dmand AI links Dr. Williams to 1 more hospital.
What medical group is Dr. Michael D. Williams part of?
Dr. Williams is linked to Boone Health Medical Group. Dmand AI links Dr. Williams to 2 more medical groups.
Does Dr. Michael D. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 20,545 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Michael D. Williams see?
CMS counts 719 Medicare patients who saw Dr. Williams in 2024, with an average age of 73.
What services does Dr. Michael D. Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were injected or infused drug (J3380), lab and pathology test (88305) and care management and other visits (99490).
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Where did Dr. Michael D. Williams go to medical school?
Dr. Williams graduated from University of Missouri, Columbia School of Medicine in 2003.
What drugs does Dr. Michael D. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Omeprazole, Pantoprazole Sodium and Linzess.
Has Dr. Michael D. Williams received payments from drug or device companies?
CMS Open Payments shows $53,533 in general payments to Dr. Williams from 45 companies from 2016 to 2025. The largest total came from Phathom Pharmaceuticals, Inc.
How long has Dr. Michael D. Williams been practicing?
Dr. Williams graduated from medical school in 2003, 23 years ago.
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