Dr. Robert Michael Williams, MD
- Medicare services, 2024
- 991
- Medicare patients, 2024
- 373
- Part D claims, 2024
- 207
- Hospital affiliations
- 5
- Industry payments
- $436
- Practice address
- 775 S Main St, Chelsea, MI 48118
- Practice phone
- Call (734) 475-3911
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Robert Michael Williams is an orthopedic surgeon in Chelsea, Michigan
Dr. Williams practices at Chelsea Hospital in Chelsea, Michigan, part of Trinity Health.
Dr. Williams' NPI, 1407878093, was assigned on July 24, 2006. Dr. Williams graduated from University of Michigan Medical School in 1999. Dr. Williams holds Michigan license 4301074263.
- NPI
- 1407878093NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0244240547
- NPI enumeration date
- July 24, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (734) 475-3911
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 53
- Medical school graduation
- 1999
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert Michael Williams practices at Chelsea Hospital in Chelsea, Michigan
Dr. Williams' primary practice is Chelsea Hospital, at 775 S Main St, Chelsea, MI 48118 in Washtenaw County. The practice phone is (734) 475-3911.
- Chelsea Hospital775 S Main St, Chelsea, MI 48118 · Washtenaw CountyPhone(734) 475-3911
Source: Dmand AI Affiliation Data
Dr. Robert Michael Williams is affiliated with 10 sites of care and 2 medical groups
Dr. Williams' primary practice is Chelsea Hospital in Chelsea, Michigan, part of Trinity Health. Dr. Williams is also affiliated with Trinity Health Ann Arbor Hospital. The medical group on file is Trinity Health IHA Medical Group. Dmand AI also links Dr. Williams to 3 more hospitals, 3 home health agencies, 2 group practices and clinics and 1 medical group, 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. Robert Michael Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 10 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Chelsea Hospital | Available with a free account |
| +9 more sites and 1 medical group | 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 Trinity Health and 6.2K+ hospitals, with verified contacts in the same login.
Dr. Robert Michael Williams is one of 823 orthopedic surgeons in Michigan
Orthopaedic surgery is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207X00000X. Dr. Williams is licensed in Michigan.
Specialties and state licenses
- Orthopaedic surgery, MichiganPrimary
Orthopedic surgeons near Dr. Williams
Counts of orthopedic surgeons 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. Robert Michael Williams billed Medicare for 991 services in 2024
CMS data shows 991 Medicare services from Dr. Williams across 14 procedure codes in 2024, for 373 Medicare patients. Medicare paid $164,005 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Surgery
- 2023: 4432024: 4522%
- Office and hospital visits
- 2023: 3632024: 31314%
- Imaging
- 2023: 2382024: 2265%
Dr. Williams compared with the Michigan median for orthopedic surgeons, 2024
- Dr. Williams
- Michigan median
- Medicare services
- 991vs 52389% above
- Medicare patients
- 373vs 1722.2 times
- Part D claims
- 173vs 802.2 times
Medians across 781 orthopedic surgeons 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.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert Michael Williams treated 373 Medicare patients in 2024, average age 74
CMS counts 373 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 201 patients. 75% of them have arthritis, and 75% have high blood pressure. 4% are also on Medicaid. Their average risk score is 0.99, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 71, with 58% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women22059%
- Men15341%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol69%
- Chronic kidney disease26%
- Ischemic heart disease25%
- Mood disorders25%
- Diabetes24%
- Anxiety23%
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 71
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. Robert Michael Williams wrote 207 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 207 Medicare Part D claims for 128 patients. 100% of them were for generic drugs. CMS names the drug for 173 of them, across 6 drugs with 11 or more claims each, at $750 in total drug cost. In 2023, CMS named 139 claims across 6 drugs.
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
- Opioids61%127 of 207 claims
- Antibiotics10%21 of 207 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: 1392024: 17324%
Drugs named by CMS: 6 in 2024, 6 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. Robert Michael Williams ranks in the 85th percentile for knee replacement in Medicare
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS counts 65 procedures of knee replacement by Dr. Williams, more than 85% of the clinicians it reports for that procedure.
- Accepts Medicare assignment
- Yes
Where Dr. Williams ranks in Medicare procedure volume
- Knee replacement
- 85th percentile65 procedures
- Hip replacement
- 78th percentile33 procedures
CMS ranks each clinician against every clinician it reports for the same procedure category.
Lower limb (leg) arthroscopy (minimally invasive joint repair): 1 to 10 procedures (CMS shows small counts as a range)
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Upper limb (arm) arthroscopy (minimally invasive joint repair): 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Robert Michael Williams received $436 in industry payments from 2017 to 2024
CMS Open Payments shows 12 general payments to Dr. Williams from 7 drug and device companies from 2017 to 2024. Food and beverage make up the largest share, 100% of the total. Smith & Nephew, Inc. paid the most, $136.
General payments to Dr. Williams by program year, 2017 to 2024
Companies that paid Dr. Williams the most, 2017 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert Michael Williams graduated from University of Michigan Medical School
Dr. Williams graduated from University of Michigan Medical School in 1999.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert Michael 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. Robert Michael 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. Robert Michael Williams' NPI number?
Dr. Robert Michael Williams' NPI number is 1407878093. It was assigned on July 24, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Michael Williams?
Dr. Robert Michael Williams is an orthopedic surgeon in Chelsea, Michigan. The primary specialty in the NPI Registry is Orthopaedic Surgery Physician (taxonomy code 207X00000X).
Where does Dr. Robert Michael Williams practice?
Dr. Williams practices at 775 S Main St, Chelsea, MI 48118. Dr. Williams' primary practice is Chelsea Hospital in Chelsea, Michigan, part of Trinity Health. Dmand AI also links Dr. Williams to 3 hospitals, 3 home health agencies, 2 group practices and clinics and 1 medical group.
What is Dr. Robert Michael Williams' office phone number?
The practice phone on file for Dr. Williams is (734) 475-3911.
What is Dr. Robert Michael Williams' medical license number?
Dr. Williams holds Michigan license 4301074263.
Which hospitals is Dr. Robert Michael Williams affiliated with?
Dr. Williams practices at Chelsea Hospital in Chelsea, Michigan. Dr. Williams is also affiliated with Trinity Health Ann Arbor Hospital. Dmand AI links Dr. Williams to 3 more hospitals.
What medical group is Dr. Robert Michael Williams part of?
Dr. Williams is linked to Trinity Health IHA Medical Group. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Robert Michael Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 991 services in 2024, and Dr. Williams accepts Medicare assignment.
How many Medicare patients does Dr. Robert Michael Williams see?
CMS counts 373 Medicare patients who saw Dr. Williams in 2024, with an average age of 74.
What services does Dr. Robert Michael Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were surgery: bones and joints (20610), office visit, established patient (99213) and diagnostic imaging (73564).
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Where did Dr. Robert Michael Williams go to medical school?
Dr. Williams graduated from University of Michigan Medical School in 1999.
What drugs does Dr. Robert Michael Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Oxycodone HCl, Hydrocodone-Acetaminophen and Naproxen.
Has Dr. Robert Michael Williams received payments from drug or device companies?
CMS Open Payments shows $436 in general payments to Dr. Williams from 7 companies from 2017 to 2024. The largest total came from Smith & Nephew, Inc.
How long has Dr. Robert Michael Williams been practicing?
Dr. Williams graduated from medical school in 1999, 27 years ago.
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