Dr. Geoffrey Colin Williams, MD, PhD
- Medicare services, 2024
- 173
- Medicare patients, 2024
- 51
- Part D claims, 2024
- 513
- Hospital affiliations
- 1
- Industry payments
- $17,667
- Practice address
- 1500 E Medical Center Dr, Ann Arbor, MI 48109
- Practice phone
- Call (734) 936-4000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
University Hospital
School-Based Health Center · Ann Arbor, Michigan
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. Geoffrey Colin Williams is an internist in Ann Arbor, Michigan
Dr. Williams practices at University Hospital in Ann Arbor, Michigan.
Dr. Williams' NPI, 1386673622, was assigned on June 30, 2006. Dr. Williams graduated from Wayne State University School of Medicine in 1983. Dr. Williams holds Michigan license 4301508919.
- NPI
- 1386673622NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0143264945
- NPI enumeration date
- June 30, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (734) 936-4000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Geoffrey Colin Williams practices at University Hospital in Ann Arbor, Michigan
Dr. Williams' primary practice is University Hospital, at 1500 E Medical Center Dr, Ann Arbor, MI 48109. The practice phone is (734) 936-4000.
- University Hospital1500 E Medical Center Dr, Ann Arbor, MI 48109Phone(734) 936-4000
Source: Dmand AI Affiliation Data
Dr. Geoffrey Colin Williams is affiliated with 3 sites of care and 1 medical group
Dr. Williams' primary practice is University Hospital in Ann Arbor, Michigan. Dr. Williams is also affiliated with University Hospital. The medical group on file is University of Michigan Health. Dmand AI also links Dr. Williams to 1 more group practice or clinic, named with a free account. Dr. Williams' employer is on file too: a school & student health.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Geoffrey Colin Williams' 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 |
|---|---|
| University Hospital | Available with a free account |
| +2 more affiliated sites | 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 each health system and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Geoffrey Colin Williams is one of 4,804 internists in Michigan
Internal medicine is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dmand AI has Dr. Williams' licenses on file in 2 states: Michigan and New York.
Specialties and state licenses
- Internal medicine, MichiganPrimary
- New York license
Internists near Dr. Williams
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. Geoffrey Colin Williams billed Medicare for 173 services in 2024
CMS data shows 173 Medicare services from Dr. Williams across 4 procedure codes in 2024, for 51 Medicare patients. Medicare paid $9,234 for them.
Dr. Williams' Medicare services by type, 2022 to 2024
- 2022
- 2024
- Other services
- 2022: 02024: 90
- Office and hospital visits
- 2022: 362024: 83131%
Where Dr. Williams' Medicare services took place, 2024
- In an office7845%
- In a facility9555%
Dr. Williams compared with the Michigan median for internists, 2024
- Dr. Williams
- Michigan median
- Medicare services
- 173vs 42359% below
- Medicare patients
- 51vs 15968% below
- Part D claims
- 486vs 31455% above
Medians across 4,524 internists in Michigan 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.
Need commercial claims for Dr. Williams?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Williams and other internists in Michigan.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Geoffrey Colin Williams treated 51 Medicare patients in 2024, average age 69
CMS counts 51 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 33 patients. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.11, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 57, with 61% 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
- Women3059%
- Men2141%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Ischemic heart disease59%
- Arthritis45%
- Diabetes31%
- Anxiety27%
- Mood disorders27%
- Tobacco use25%
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 57
Patient panel by sex, all payers
- Women61%
- Men39%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Geoffrey Colin Williams wrote 513 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 513 Medicare Part D claims for 98 patients. 59% of them were for generic drugs. CMS names the drug for 486 of them, across 8 drugs with 11 or more claims each, at $200,293 in total drug cost. In 2023, CMS named 25 claims across 2 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic302 claims59%
- Brand-name211 claims41%
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.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 252024: 4861844%
Drugs named by CMS: 8 in 2024, 2 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. Geoffrey Colin Williams offers telehealth to Medicare patients
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Williams as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
Filter 7.4M+ HCPs by Medicare procedures, Part D drugs and Open Payments history, then reach them with verified contacts in one login.
Dr. Geoffrey Colin Williams received $17,667 in industry payments from 2016 to 2023
CMS Open Payments shows 23 general payments to Dr. Williams from 4 drug and device companies from 2016 to 2023. Speaker and faculty fees make up the largest share, 81% of the total. Pfizer Inc. paid the most, $17,288.
General payments to Dr. Williams by program year, 2016 to 2023
General payments to Dr. Williams by kind, 2016 to 2023
- Speaker and faculty fees$14,34181%
- Travel and lodging$2,44514%
- Food and beverage$8825%
Companies that paid Dr. Williams the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Geoffrey Colin Williams graduated from Wayne State University School of Medicine
Dr. Williams graduated from Wayne State University School of Medicine in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Geoffrey Colin 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) |
| 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. Geoffrey Colin 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. Geoffrey Colin Williams' NPI number?
Dr. Geoffrey Colin Williams' NPI number is 1386673622. It was assigned on June 30, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Geoffrey Colin Williams?
Dr. Geoffrey Colin Williams is an internist in Ann Arbor, Michigan. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Geoffrey Colin Williams practice?
Dr. Williams practices at 1500 E Medical Center Dr, Ann Arbor, MI 48109. Dr. Williams' primary practice is University Hospital in Ann Arbor, Michigan. Dmand AI also links Dr. Williams to 1 group practice or clinic.
What is Dr. Geoffrey Colin Williams' office phone number?
The practice phone on file for Dr. Williams is (734) 936-4000.
What is Dr. Geoffrey Colin Williams' medical license number?
Dr. Williams holds Michigan license 4301508919, one of the licenses on file in 2 states.
Which states has Dr. Geoffrey Colin Williams been licensed in?
Dmand AI has state licenses on file for Dr. Williams in Michigan and New York.
Which hospitals is Dr. Geoffrey Colin Williams affiliated with?
Dr. Williams is affiliated with University Hospital.
What medical group is Dr. Geoffrey Colin Williams part of?
Dr. Williams is linked to University of Michigan Health.
Does Dr. Geoffrey Colin Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 173 services in 2024, and Dr. Williams accepts Medicare assignment.
Does Dr. Geoffrey Colin Williams offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Williams as offering telehealth services.
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. Geoffrey Colin Williams see?
CMS counts 51 Medicare patients who saw Dr. Williams in 2024, with an average age of 69.
What services does Dr. Geoffrey Colin Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were medicare service (G2212), office visit, established patient (99214) and office visit, established patient (99215).
Where did Dr. Geoffrey Colin Williams go to medical school?
Dr. Williams graduated from Wayne State University School of Medicine in 1983.
What drugs does Dr. Geoffrey Colin Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Ezetimibe, Repatha Sureclick and Varenicline Tartrate.
Has Dr. Geoffrey Colin Williams received payments from drug or device companies?
CMS Open Payments shows $17,667 in general payments to Dr. Williams from 4 companies from 2016 to 2023. The largest total came from Pfizer Inc.
How long has Dr. Geoffrey Colin Williams been practicing?
Dr. Williams graduated from medical school in 1983, 43 years ago.
Selling to internal medicine practices?
See internists in Michigan by site of care and group
Find the practices, groups and hospitals they work with, and the right people to contact at each.
- 30 days free
- Self-serve
- No credit card