Mark Vincent Williams, MD
Hospitalist Physician · Saint Louis, MO
Mark Vincent Williams, MD is a hospitalist physician with a practice address in Saint Louis, Missouri, and NPI 1962425819, issued on Jul 25, 2006. Check the license (Missouri 2021045476, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Mark Vincent Williams
- Credential
- MD
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 2021045476 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110
- Phone
- (314) 362-1700
- Enumerated
- Jul 25, 2006
- Record last updated
- Apr 17, 2025
- Fax
- (314) 362-9878
- Medicaid ID
- 200104623 MO
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 930 in Missouri → Look up another NPI →
Also registered at 1 Barnes Jewish Hospital Plz
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Mark Vincent Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2021045476Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average hospitalist physician in 2024
69 Medicare Part D claims for 19 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Donepezil Hcl11 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 practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
Mark Vincent Williams among 930 hospitalist physician records in Missouri
Mark Vincent Williams, MD is one of 930 hospitalist physician records with a practice address in Missouri. 87% 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 2% of them.
- NPI issued2006 · 2% of these records are older, 83% newer
- In a Medicare fileYes · 87% of these records are
- In the CMS Doctors and Clinicians fileNo · 77% of these records are
- Record last updated2025 · 25% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
419 hospitalist physician records list a practice address in Saint Louis
They are 419 of the 27,605 NPPES records with a practice address in Saint Louis, and 930 hospitalist physician records in Missouri.
All 930 in Missouri → Every provider in Saint Louis → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Florence Almiron-Torralba, MDSaint Louis, MO 631101518939891
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- Dennis Chang, MDSaint Louis, MO 631101083651202
- Eve Colson, MDSaint Louis, MO 631101730163577
- John Cras, MDSaint Louis, MO 631101598701815
- Lakshman Darsi, MDSaint Louis, MO 631101184670622
- Yasmeen Daud, MDSaint Louis, MO 631101073539292
- Christine Hrach, MDSaint Louis, MO 631101669498960
Common questions
What is Mark Vincent Williams, MD's NPI number?
Mark Vincent Williams, MD's National Provider Identifier (NPI) is 1962425819, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark Vincent Williams, MD located?
The NPPES record lists a practice address at 1 Barnes Jewish Hospital Plz, Saint Louis, MO, 63110. Phone: (314) 362-1700. Providers update this record themselves, so call before visiting.
How can I verify Mark Vincent Williams, MD's license?
NPPES lists Missouri license number 2021045476, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Mark Vincent Williams, MD prescribe under Medicare Part D?
In 2024, Mark Vincent Williams, MD had 69 Medicare Part D claims for 19 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Mark Vincent Williams, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. 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.