Dr. Calvin Thomas Williams Jr., MD, PhD
- Medicare services, 2024
- 892
- Medicare patients, 2024
- 482
- Part D claims, 2024
- 728
- MIPS score, 2024
- 82
- Hospital affiliations
- 3
- Practice address
- 201 East University Parkway, Baltimore, MD 21218
- Practice phone
- Call (410) 554-2227
- 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. Calvin Thomas Williams Jr. is an infectious disease specialist in Baltimore, Maryland
Dr. Williams practices at MedStar Union Memorial Hospital in Baltimore, Maryland, part of MedStar Health.
Dr. Williams' NPI, 1023308640, was assigned on April 15, 2011. Dr. Williams graduated from University of Maryland School of Medicine in 2011. Dr. Williams holds Maryland license D0081038.
- NPI
- 1023308640NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7517105414
- NPI enumeration date
- April 15, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (410) 554-2227
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 41
- Medical school graduation
- 2011
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Calvin Thomas Williams Jr. practices at MedStar Union Memorial Hospital in Baltimore, Maryland
Dr. Williams' primary practice is MedStar Union Memorial Hospital, at 201 East University Parkway, Baltimore, MD 21218 in Baltimore City. The practice phone is (410) 554-2227.
- MedStar Union Memorial Hospital201 East University Parkway, Baltimore, MD 21218 · Baltimore CityPhone(410) 554-2227
Source: Dmand AI Affiliation Data
Dr. Calvin Thomas Williams Jr. is affiliated with 4 sites of care and 1 medical group
Dr. Williams' primary practice is MedStar Union Memorial Hospital in Baltimore, Maryland, part of MedStar Health. Dr. Williams is also affiliated with MedStar Good Samaritan Hospital. The medical group on file is MedStar Medical Group. Dmand AI also links Dr. Williams to 1 more hospital and 1 home health agency, 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. Calvin Thomas Williams Jr.'s practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| MedStar Union Memorial Hospital | Available with a free account |
| +3 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Calvin Thomas Williams Jr. is one of 303 infectious disease specialists in Maryland
Infectious disease is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 207RI0200X. Dmand AI has Dr. Williams' licenses on file in 2 states: Maryland and Delaware.
Specialties and state licenses
- Infectious disease, MarylandPrimary
- Delaware license
Infectious disease specialists near Dr. Williams
Counts of infectious disease specialists 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. Calvin Thomas Williams Jr. billed Medicare for 892 services in 2024
CMS data shows 892 Medicare services from Dr. Williams across 3 procedure codes in 2024, for 482 Medicare patients. Medicare paid $96,224 for them.
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 9412024: 8925%
Where Dr. Williams' Medicare services took place, 2024
- In an office829%
- In a facility81091%
Dr. Williams compared with the Maryland median for infectious disease specialists, 2024
- Dr. Williams
- Maryland median
- Medicare services
- 892vs 2174.1 times
- Medicare patients
- 482vs 1263.8 times
- Part D claims
- 592vs 986.0 times
Medians across 250 infectious disease specialists in Maryland 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. Calvin Thomas Williams Jr. treated 482 Medicare patients in 2024, average age 71
CMS counts 482 Medicare patients who saw Dr. Williams in 2024. The largest group is 65 to 74, with 163 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 47% are also on Medicaid. Their average risk score is 3.87, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 60, with 42% women.
Dr. Williams' Medicare patients by age, 2024
Dr. Williams' Medicare patients by sex, 2024
- Women23749%
- Men24551%
Chronic conditions among Dr. Williams' Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis65%
- Chronic kidney disease63%
- Diabetes62%
- Mood disorders59%
- Ischemic heart disease55%
- Heart failure54%
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 60
Patient panel by sex, all payers
- Women42%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Calvin Thomas Williams Jr. wrote 728 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 728 Medicare Part D claims for 98 patients. 30% of them were for generic drugs. CMS names the drug for 592 of them, across 17 drugs with 11 or more claims each, at $1,678,636 in total drug cost. In 2023, CMS named 490 claims across 17 drugs.
Dr. Williams' Part D claims by kind of drug, 2024
- Generic221 claims30%
- Brand-name507 claims70%
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
- Antibiotics18%131 of 728 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: 4902024: 59221%
Drugs named by CMS: 17 in 2024, 17 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. Calvin Thomas Williams Jr. scored 82 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 82 out of 100 for Dr. Williams for performance year 2024, reported as part of a group. 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
Dr. Williams' MIPS scores, performance year 2024
- 82of 100Final score
- 67.9of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
- 69of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Calvin Thomas Williams Jr. received $92 in industry payments from 2018 to 2025
CMS Open Payments shows 5 general payments to Dr. Williams from 3 drug and device companies from 2018 to 2025. Food and beverage make up the largest share, 72% of the total. Gilead Sciences, Inc. paid the most, $49.
General payments to Dr. Williams by program year, 2018 to 2025
General payments to Dr. Williams by kind, 2018 to 2025
- Food and beverage$6672%
- Education$2628%
Companies that paid Dr. Williams the most, 2018 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Calvin Thomas Williams Jr. graduated from University of Maryland School of Medicine
Dr. Williams graduated from University of Maryland School of Medicine in 2011.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Calvin Thomas Williams Jr.'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)Clinician Public Reporting: Overall MIPS Performance (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. Calvin Thomas Williams Jr.
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. Calvin Thomas Williams Jr.'s NPI number?
Dr. Calvin Thomas Williams Jr.'s NPI number is 1023308640. It was assigned on April 15, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Calvin Thomas Williams Jr.?
Dr. Calvin Thomas Williams Jr. is an infectious disease specialist in Baltimore, Maryland. The primary specialty in the NPI Registry is Infectious Disease Physician (taxonomy code 207RI0200X).
Where does Dr. Calvin Thomas Williams Jr. practice?
Dr. Williams practices at 201 East University Parkway, Baltimore, MD 21218. Dr. Williams' primary practice is MedStar Union Memorial Hospital in Baltimore, Maryland, part of MedStar Health. Dmand AI also links Dr. Williams to 1 hospital and 1 home health agency.
What is Dr. Calvin Thomas Williams Jr.'s office phone number?
The practice phone on file for Dr. Williams is (410) 554-2227.
What is Dr. Calvin Thomas Williams Jr.'s medical license number?
Dr. Williams holds Maryland license D0081038, one of the licenses on file in 2 states.
Which states has Dr. Calvin Thomas Williams Jr. been licensed in?
Dmand AI has state licenses on file for Dr. Williams in Maryland and Delaware.
Which hospitals is Dr. Calvin Thomas Williams Jr. affiliated with?
Dr. Williams practices at MedStar Union Memorial Hospital in Baltimore, Maryland. Dr. Williams is also affiliated with MedStar Good Samaritan Hospital. Dmand AI links Dr. Williams to 1 more hospital.
What medical group is Dr. Calvin Thomas Williams Jr. part of?
Dr. Williams is linked to MedStar Medical Group.
Does Dr. Calvin Thomas Williams Jr. accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 892 services in 2024, and Dr. Williams accepts Medicare assignment.
Does Dr. Calvin Thomas Williams Jr. offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Williams as offering telehealth services.
Show 7 more questionsShow fewer questions
What is Dr. Calvin Thomas Williams Jr.'s MIPS score?
Dr. Williams' MIPS final score for performance year 2024 is 82 out of 100, reported as part of a group.
How many Medicare patients does Dr. Calvin Thomas Williams Jr. see?
CMS counts 482 Medicare patients who saw Dr. Williams in 2024, with an average age of 71.
What services does Dr. Calvin Thomas Williams Jr. bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were hospital inpatient care (99233), hospital inpatient care (99223) and office visit, established patient (99213).
Where did Dr. Calvin Thomas Williams Jr. go to medical school?
Dr. Williams graduated from University of Maryland School of Medicine in 2011.
What drugs does Dr. Calvin Thomas Williams Jr. prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Biktarvy, Genvoya and Odefsey.
Has Dr. Calvin Thomas Williams Jr. received payments from drug or device companies?
CMS Open Payments shows $92 in general payments to Dr. Williams from 3 companies from 2018 to 2025. The largest total came from Gilead Sciences, Inc.
How long has Dr. Calvin Thomas Williams Jr. been practicing?
Dr. Williams graduated from medical school in 2011, 15 years ago.
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