Geoffrey Colin Williams, MD, PHD
Internal Medicine Physician · Ann Arbor, MI
Geoffrey Colin Williams, MD, PHD is an internal medicine physician with a practice address in Ann Arbor, Michigan, and NPI 1386673622, issued on Jun 30, 2006. Check the license (Michigan 4301508919, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Geoffrey Colin Williams
- Credential
- MD, PHD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 4301508919 MI
162638 NY
Self-reported in NPPES; status is on the state search - Practice location
- 24 Frank Lloyd Wright Dr, Ann Arbor, MI 48105
- Phone
- (888) 287-1082
- Enumerated
- Jun 30, 2006
- Record last updated
- Sep 15, 2023
- Medicare enrollment
- Enrolled (PECOS I20230920001279); accepts Medicare assignment
- Medical or professional school
- Wayne State University School Of Medicine, 1983
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 5,735 in Michigan → Look up another NPI →
Also registered at 24 Frank Lloyd Wright Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Geoffrey Colin Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301508919Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
84% fewer Medicare Part D claims than the average internal medicine physician in 2024
513 Medicare Part D claims for 98 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 41% of claims.
Most prescribed
- Ezetimibe142 claims
- Repatha Sureclick141 claims
- Varenicline Tartrate54 claims
- Atorvastatin Calcium45 claims
- Praluent Pen35 claims
- Vascepa29 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 99 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Regents OF The University OF MichiganCanton, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geoffrey Colin Williams among 5,735 internal medicine physician records in Michigan
Geoffrey Colin Williams, MD, PHD is one of 5,735 internal medicine physician records with a practice address in Michigan. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1983 · median 2006 among the 3,564 with a school on file
- Record last updated2023 · 54% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
479 internal medicine physician records list a practice address in Ann Arbor
They are 479 of the 15,616 NPPES records with a practice address in Ann Arbor, and 5,735 internal medicine physician records in Michigan.
All 5,735 in Michigan → Every provider in Ann Arbor → Internal Medicine Physician nationwide →
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Common questions
What is Geoffrey Colin Williams, MD, PHD's NPI number?
Geoffrey Colin Williams, MD, PHD's National Provider Identifier (NPI) is 1386673622, issued on Jun 30, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Geoffrey Colin Williams, MD, PHD located?
The NPPES record lists a practice address at 24 Frank Lloyd Wright Dr, Ann Arbor, MI, 48105. Phone: (888) 287-1082. Providers update this record themselves, so call before visiting.
How can I verify Geoffrey Colin Williams, MD, PHD's license?
NPPES lists Michigan license number 4301508919, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Geoffrey Colin Williams, MD, PHD prescribe under Medicare Part D?
In 2024, Geoffrey Colin Williams, MD, PHD had 513 Medicare Part D claims for 98 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Geoffrey Colin Williams, MD, PHD's MIPS final score?
The 2023 MIPS final score is 99 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.