Johan Guillaume
Hospitalist Physician · New York, NY
Johan Guillaume is a hospitalist physician with a practice address in New York, New York, and NPI 1457738593, issued on Apr 28, 2015. Check the license (New York 315641, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Johan Guillaume
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 315641 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1305 York Ave, New York, NY 10021
- Phone
- (646) 962-8747
- Enumerated
- Apr 28, 2015
- Record last updated
- Nov 4, 2022
- Medicare enrollment
- Enrolled (PECOS I20220818000434); accepts Medicare assignment
- Entity
- Type 1 · individual
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Verify Johan Guillaume in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 315641Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average hospitalist physician in 2024
19 Medicare Part D claims for 11 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
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): 84.5 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).
Bills Medicare through one group practice
- New York UniversityNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Johan Guillaume among 2,067 hospitalist physician records in New York
Johan Guillaume is one of 2,067 hospitalist physician records with a practice address in New York. 93% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 48% of them.
- NPI issued2015 · 48% of these records are older, 47% newer
- In a Medicare fileYes · 93% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2015 · median 2013 among the 1,716 with a school on file
- Record last updated2022 · 37% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in New York
There are 2,067 hospitalist physician records in New York.
All 2,067 in New York → Every provider in New York → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
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- Josef BrejtNew York, NY 100211932594868
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- Geeta Laud, M.D.New York, NY 100211356647192
- Mitchell Nelson, M.D.New York, NY 100211861786824
Common questions
What is Johan Guillaume's NPI number?
Johan Guillaume's National Provider Identifier (NPI) is 1457738593, issued on Apr 28, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Johan Guillaume located?
The NPPES record lists a practice address at 1305 York Ave, New York, NY, 10021. Phone: (646) 962-8747. Providers update this record themselves, so call before visiting.
How can I verify Johan Guillaume's license?
NPPES lists New York license number 315641, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Johan Guillaume prescribe under Medicare Part D?
In 2024, Johan Guillaume had 19 Medicare Part D claims for 11 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Johan Guillaume's MIPS final score?
The 2023 MIPS final score is 84.5 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.