Dr. Mark D. Williams, MD
- Medicare services, 2024
- 62
- Medicare patients, 2024
- 24
- Part D claims, 2024
- 209
- Affiliated sites
- 3
- Medical group
- 1
- Practice address
- 200 First Street SW, Rochester, MN 55905
- Practice phone
- Call (507) 284-5968
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Mayo Clinic Breast Diagnostic Clinic
Mammography / Breast Imaging Center · Rochester, Minnesota
Find Dr. Williams' professional email, personal email and mobile number
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Dr. Mark D. Williams is a psychiatrist in Rochester, Minnesota
Dr. Williams practices at Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota.
Dr. Williams' NPI, 1811967367, was assigned on January 26, 2006. Dr. Williams graduated from University of Minnesota Medical School in 1986. Dr. Williams holds Minnesota license 31386.
- NPI
- 1811967367NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2668517996
- NPI enumeration date
- January 26, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (507) 284-5968
- 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 Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mark D. Williams practices at Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota
Dr. Williams' primary practice is Mayo Clinic Breast Diagnostic Clinic, at 200 First Street SW, Rochester, MN 55905. The practice phone is (507) 284-5968.
- Mayo Clinic Breast Diagnostic Clinic200 First Street SW, Rochester, MN 55905Phone(507) 284-5968
Source: Dmand AI Affiliation Data
Dr. Mark D. Williams is affiliated with 3 sites of care and 1 medical group
Dr. Williams' primary practice is Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota. The medical group on file is Mayo Clinic. Dmand AI also links Dr. Williams to 1 more clinical lab and 1 hospice, each named with a free account. Dr. Williams' employer is on file too: a breast imaging center.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mark D. 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 |
|---|---|
| Mayo Clinic Breast Diagnostic Clinic | 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. Mark D. Williams is one of 742 psychiatrists in Minnesota
Psychiatry is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Williams is licensed in Minnesota.
Specialties and state licenses
- Psychiatry, MinnesotaPrimary
Psychiatrists near Dr. Williams
Counts of psychiatrists 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. Mark D. Williams billed Medicare for 62 services in 2024
CMS data shows 62 Medicare services from Dr. Williams across 3 procedure codes in 2024, for 24 Medicare patients. Medicare paid $2,894 for them. Every service was in an office.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 322024: 3716%
- Other services
- 2023: 02024: 25
Dr. Williams compared with the Minnesota median for psychiatrists, 2024
- Dr. Williams
- Minnesota median
- Medicare services
- 62vs 16061% below
- Medicare patients
- 24vs 5254% below
- Part D claims
- 137vs 1509% below
Medians across 752 psychiatrists in Minnesota 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. Mark D. Williams treated 24 Medicare patients in 2024, average age 65
CMS counts 24 Medicare patients who saw Dr. Williams in 2024. 75% of them have mood disorders, and 67% have depression. Their average risk score is 1.30, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 51, with 91% women.
Chronic conditions among Dr. Williams' Medicare patients, 2024
- Mood disorders75%
- Depression67%
- High blood pressure58%
- Anxiety50%
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 51
Patient panel by sex, all payers
- Women91%
- Men9%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mark D. Williams wrote 209 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 209 Medicare Part D claims for 33 patients. 100% of them were for generic drugs. CMS names the drug for 137 of them, across 8 drugs with 11 or more claims each, at $2,221 in total drug cost. In 2023, CMS named 155 claims across 10 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic208 claims100%
- Brand-name and other1 claims0%
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
- Antipsychotics, patients 65 and over15%32 of 209 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: 1552024: 13712%
Drugs named by CMS: 8 in 2024, 10 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. Mark D. 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)
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Dr. Mark D. Williams graduated from University of Minnesota Medical School
Dr. Williams graduated from University of Minnesota Medical School in 1986.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Mark D. 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) |
| 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. Mark D. 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. Mark D. Williams' NPI number?
Dr. Mark D. Williams' NPI number is 1811967367. It was assigned on January 26, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Mark D. Williams?
Dr. Mark D. Williams is a psychiatrist in Rochester, Minnesota. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Mark D. Williams practice?
Dr. Williams practices at 200 First Street SW, Rochester, MN 55905. Dr. Williams' primary practice is Mayo Clinic Breast Diagnostic Clinic in Rochester, Minnesota. Dmand AI also links Dr. Williams to 1 clinical lab and 1 hospice.
What is Dr. Mark D. Williams' office phone number?
The practice phone on file for Dr. Williams is (507) 284-5968.
What is Dr. Mark D. Williams' medical license number?
Dr. Williams holds Minnesota license 31386.
What medical group is Dr. Mark D. Williams part of?
Dr. Williams is linked to Mayo Clinic.
Does Dr. Mark D. Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 62 services in 2024, and Dr. Williams accepts Medicare assignment.
Does Dr. Mark D. Williams offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Williams as offering telehealth services.
How many Medicare patients does Dr. Mark D. Williams see?
CMS counts 24 Medicare patients who saw Dr. Williams in 2024, with an average age of 65.
What services does Dr. Mark D. Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were medicare service (G2211), office visit, established patient (99213) and office visit, established patient (99214).
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Where did Dr. Mark D. Williams go to medical school?
Dr. Williams graduated from University of Minnesota Medical School in 1986.
What drugs does Dr. Mark D. Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Olanzapine, Sertraline HCl and Duloxetine HCl.
How long has Dr. Mark D. Williams been practicing?
Dr. Williams graduated from medical school in 1986, 40 years ago.
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