Dr. Fred Harrison Williams, MD
- Medicare services, 2024
- 127
- Medicare patients, 2024
- 131
- Part D claims, 2024
- 478
- MIPS score, 2024
- 64
- Hospital affiliations
- 1
- Practice address
- 121 St Lukes Center Dr, Chesterfield, MO 63017
- Practice phone
- Call (314) 529-4900
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Gateway Gastroenterology Inc
Chesterfield, Missouri
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. Fred Harrison Williams is a gastroenterologist in Chesterfield, Missouri
Dr. Williams practices at Gateway Gastroenterology Inc in Chesterfield, Missouri.
Dr. Williams' NPI, 1386644326, was assigned on July 29, 2005. Dr. Williams graduated from University of Missouri, Kansas City, School of Medicine in 1986. Dr. Williams holds Missouri license 118411.
- NPI
- 1386644326NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2961580261
- NPI enumeration date
- July 29, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (314) 529-4900
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 66
- Medical school graduation
- 1986
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Fred Harrison Williams practices at Gateway Gastroenterology Inc in Chesterfield, Missouri
Dr. Williams' primary practice is Gateway Gastroenterology Inc, at 121 St Lukes Center Dr, Chesterfield, MO 63017 in Saint Louis County. The practice phone is (314) 529-4900.
- Gateway Gastroenterology Inc121 St Lukes Center Dr, Chesterfield, MO 63017 · Saint Louis CountyPhone(314) 529-4900
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Fred Harrison Williams is affiliated with 3 sites of care and 1 medical group
Dr. Williams' primary practice is Gateway Gastroenterology Inc in Chesterfield, Missouri. Dr. Williams is also affiliated with St. Luke's Hospital. The medical group on file is Gateway Gastroenterology. Dmand AI also links Dr. Williams to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Fred Harrison Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Gateway Gastroenterology Inc | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Fred Harrison 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. Fred Harrison Williams billed Medicare for 127 services in 2024
CMS data shows 127 Medicare services from Dr. Williams across 5 procedure codes in 2024, for 131 Medicare patients. Medicare paid $9,701 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 2652024: 9763%
- Lab and pathology
- 2023: 1302024: 3077%
- Other services
- 2023: 762024: 0100%
- Surgery
- 2023: 1232024: 0100%
Dr. Williams compared with the Missouri median for gastroenterologists, 2024
- Dr. Williams
- Missouri median
- Medicare services
- 127vs 41669% below
- Medicare patients
- 131vs 29656% below
- Part D claims
- 359vs 43417% below
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. Fred Harrison Williams treated 131 Medicare patients in 2024, average age 75
CMS counts 131 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. Their average risk score is 1.25, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 64, with 57% 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
- Women7658%
- Men5542%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis52%
- Anxiety34%
- Ischemic heart disease30%
- Mood disorders30%
- Depression29%
- Chronic kidney disease24%
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 64
Patient panel by sex, all payers
- Women57%
- Men43%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Fred Harrison Williams wrote 478 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 478 Medicare Part D claims for 193 patients. 87% of them were for generic drugs. CMS names the drug for 359 of them, across 10 drugs with 11 or more claims each, at $36,791 in total drug cost. In 2023, CMS named 803 claims across 22 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic415 claims87%
- Brand-name63 claims13%
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
- Antibiotics4%20 of 478 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: 8032024: 35955%
Drugs named by CMS: 10 in 2024, 22 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. Fred Harrison Williams scored 64 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 64 out of 100 for Dr. Williams for performance year 2024, reported as part of a group. Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Williams' MIPS scores, performance year 2024
- 64of 100Final score
- 79.9of 100Quality
- 0of 100Promoting Interoperability
- 40of 100Improvement Activities
- 83of 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. Fred Harrison Williams received $556 in industry payments from 2021 to 2024
CMS Open Payments shows 31 general payments to Dr. Williams from 8 drug and device companies from 2021 to 2024. Food and beverage make up the largest share, 58% of the total. Sebela Pharmaceuticals Inc. paid the most, $137.
General payments to Dr. Williams by program year, 2021 to 2024
General payments to Dr. Williams by kind, 2021 to 2024
- Food and beverage$32058%
- Gifts$13725%
- Education$9918%
Companies that paid Dr. Williams the most, 2021 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Fred Harrison Williams graduated from University of Missouri, Kansas City, School of Medicine
Dr. Williams graduated from University of Missouri, Kansas City, School of Medicine in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Fred Harrison 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 | 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 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)Clinician Public Reporting: Overall MIPS Performance (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. Fred Harrison 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. Fred Harrison Williams' NPI number?
Dr. Fred Harrison Williams' NPI number is 1386644326. It was assigned on July 29, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Fred Harrison Williams?
Dr. Fred Harrison Williams is a gastroenterologist in Chesterfield, Missouri. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Fred Harrison Williams practice?
Dr. Williams practices at 121 St Lukes Center Dr, Chesterfield, MO 63017. Dr. Williams' primary practice is Gateway Gastroenterology Inc in Chesterfield, Missouri. Dmand AI also links Dr. Williams to 1 group practice or clinic.
What is Dr. Fred Harrison Williams' office phone number?
The practice phone on file for Dr. Williams is (314) 529-4900.
What is Dr. Fred Harrison Williams' medical license number?
Dr. Williams holds Missouri license 118411.
Which hospitals is Dr. Fred Harrison Williams affiliated with?
Dr. Williams is affiliated with St. Luke's Hospital.
What medical group is Dr. Fred Harrison Williams part of?
Dr. Williams is linked to Gateway Gastroenterology.
Does Dr. Fred Harrison Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 127 services in 2024, and Dr. Williams accepts Medicare assignment.
What is Dr. Fred Harrison Williams' MIPS score?
Dr. Williams' MIPS final score for performance year 2024 is 64 out of 100, reported as part of a group.
How many Medicare patients does Dr. Fred Harrison Williams see?
CMS counts 131 Medicare patients who saw Dr. Williams in 2024, with an average age of 75.
Show 5 more questionsShow fewer questions
What services does Dr. Fred Harrison Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were office visit, established patient (99214), lab and pathology test (88305) and office visit, established patient (99213).
Where did Dr. Fred Harrison Williams go to medical school?
Dr. Williams graduated from University of Missouri, Kansas City, School of Medicine in 1986.
What drugs does Dr. Fred Harrison Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Pantoprazole Sodium, Famotidine and Sod Sulf-Potass Sulf-Mag Sulf.
Has Dr. Fred Harrison Williams received payments from drug or device companies?
CMS Open Payments shows $556 in general payments to Dr. Williams from 8 companies from 2021 to 2024. The largest total came from Sebela Pharmaceuticals Inc.
How long has Dr. Fred Harrison Williams been practicing?
Dr. Williams graduated from medical school in 1986, 40 years ago.
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