Geoffrey Williams, MD, PHD
NPI 1386673622 · Internal Medicine Physician · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Geoffrey Williams, MD, PHD is a Internal Medicine Physician provider in Ann Arbor, MI (NPI 1386673622).
Provider details
- NPI number
- 1386673622
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- 162638 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
173 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 27 | $98 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 26 | $31 |
| Prolonged Office Or Other Outpatient Evaluation and Management Service(s) Beyond the Maximum Required Time of the Primary Procedure Which Has Been Selected Using Total Time on the Date of the Primary Service; Each Additional 15 Minutes By the Physician OrG2212 | 24 | $32 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 22 | $145 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ezetimibe | 142 | 53 |
| Evolocumabbrand: Repatha Sureclick | 141 | 30 |
| Varenicline Tartrate | 54 | 25 |
| Atorvastatin Calcium | 45 | 23 |
| Alirocumabbrand: Praluent Pen | 35 | — |
| Icosapent Ethylbrand: Vascepa | 29 | — |
| Icosapent Ethyl | 20 | — |
Practice location
Mailing address
Additional practice locations (1)
- 601 Elmwood AveBox MedRochester, NY 14642-0001Phone: (585) 530-2050
Registry dates
- Enumerated
- 2006-06-30
- Last updated
- 2023-09-15
- Certified
- 2023-09-15
Frequently asked questions
- What is Geoffrey Williams's NPI number?
- Geoffrey Williams's National Provider Identifier (NPI) is 1386673622, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Geoffrey Williams's specialty?
- Geoffrey Williams is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Geoffrey Williams located?
- Geoffrey Williams's practice location on file with NPPES is 24 Frank Lloyd Wright Dr, Ann Arbor, MI 48105-9484.
- What is Geoffrey Williams's phone number?
- The practice phone number listed in the NPPES registry for Geoffrey Williams is (888) 287-1082.
- Does Geoffrey Williams accept Medicare?
- Geoffrey Williams is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Geoffrey Williams's NPI active?
- Yes — Geoffrey Williams's NPI (1386673622) is active in the NPPES registry as of the last update on 2023-09-15.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.