Matthew Harris Grant, M.D.
Infectious Disease Physician · New Haven, CT
Matthew Harris Grant, M.D. is an infectious disease physician with a practice address in New Haven, Connecticut, and NPI 1558579045, issued on May 18, 2007. Check the license (Connecticut 050975, as entered in NPPES) on the Connecticut Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Matthew Harris Grant
- Credential
- M.D.
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- 050975 CT
Self-reported in NPPES; status is on the state search - Practice location
- 800 Howard Ave, New Haven, CT 06519
- Phone
- (203) 785-3561
- Enumerated
- May 18, 2007
- Record last updated
- Jun 29, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20120809000158); accepts Medicare assignment
- Medical or professional school
- State University Of Ny Upstate Medical University, 2006
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 202 in Connecticut → Look up another NPI →
Also registered at 800 Howard Ave
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Verify Matthew Harris Grant in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersConnecticut Medical Examining Board
Search for license 050975Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average infectious disease physician in 2024
80 Medicare Part D claims for 27 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D. Brand-name drugs were 19% of claims.
Most prescribed
- Cephalexin28 claims
- Doxycycline Hyclate13 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): 73.6 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
- Yale UniversityNew Haven, CT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Matthew Harris Grant among 202 infectious disease physician records in Connecticut
Matthew Harris Grant, M.D. is one of 202 infectious disease physician records with a practice address in Connecticut. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 43% of them.
- NPI issued2007 · 43% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2006 · median 2003 among the 136 with a school on file
- Record last updated2012 · 66% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RI0200X and a Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in Connecticut
There are 202 infectious disease physician records in Connecticut.
All 202 in Connecticut → Every provider in New Haven → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Frederick Altice, MDNew Haven, CT 065191710960158
- Arti Barnes, MD, MBBS, MPHNew Haven, CT 065191013127455
- Michael Cappello, MDNew Haven, CT 065191659350528
- Elizabeth Cooney, MDNew Haven, CT 065191588647705
- Louise Marie Dembry, MDNew Haven, CT 065191033192257
- John Francis, MDNew Haven, CT 065191538182175
- Manisha Juthani-Mehta, MDNew Haven, CT 065191841307725
- Barbara Kazmierczak, MDNew Haven, CT 065191659354876
Common questions
What is Matthew Harris Grant, M.D.'s NPI number?
Matthew Harris Grant, M.D.'s National Provider Identifier (NPI) is 1558579045, issued on May 18, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Matthew Harris Grant, M.D. located?
The NPPES record lists a practice address at 800 Howard Ave, New Haven, CT, 06519. Phone: (203) 785-3561. Providers update this record themselves, so call before visiting.
How can I verify Matthew Harris Grant, M.D.'s license?
NPPES lists Connecticut license number 050975, as entered by the provider. Search the Connecticut Medical Examining Board at https://www.elicense.ct.gov/Lookup/LicenseLookup.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Matthew Harris Grant, M.D. prescribe under Medicare Part D?
In 2024, Matthew Harris Grant, M.D. had 80 Medicare Part D claims for 27 beneficiaries; the average among infectious disease physician prescribers was 689. Part D covers Medicare prescriptions only.
What is Matthew Harris Grant, M.D.'s MIPS final score?
The 2023 MIPS final score is 73.6 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.