John Koreth, MBBS DPHIL
Hematology (Internal Medicine) Physician · Boston, MA
John Koreth, MBBS DPHIL is a hematology (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1396706503, issued on Mar 29, 2006. Check the license (Massachusetts 208706, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John Koreth
- Credential
- MBBS DPHIL
- Primary taxonomy
- Hematology (Internal Medicine) Physician 207RH0000X
- License number
- 208706 MA
Self-reported in NPPES; status is on the state search - Practice location
- 450 Brookline Ave, Boston, MA 02215
- Phone
- (617) 632-2949
- Enumerated
- Mar 29, 2006
- Record last updated
- May 18, 2026
- Fax
- (617) 632-5168
- Medicaid ID
- 2042941 MA
- Medicare enrollment
- Enrolled (PECOS I20040728001478); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hematology (internal medicine) physician records → All 117 in Massachusetts → Look up another NPI →
Also registered at 450 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Gregory Abel, MDHematology & Oncology Physician1285611954
- Lara Abousamra, PHARMDPharmacist Clinician (PhC)/ Clinical Pharmacy Specialist1851183404
- Karley Adams, PAPhysician Assistant1578261764
- Lauren Adams, PA-CPhysician Assistant1902763469
- Ana Aguilar-Bonilla, M.D.Pediatric Hematology & Oncology Physician1023319761
- Andrew Aguirre, MD, PHDMedical Oncology Physician1609071208
Verify John Koreth in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 208706Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
17% fewer Medicare Part D claims than the average hematology (internal medicine) physician in 2024
412 Medicare Part D claims for 59 beneficiaries, against an average of 496 among the 1,036 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Gabapentin37 claims
- Prednisone33 claims
- Acyclovir31 claims
- Jakafi25 claims
- Ursodiol24 claims
- Sulfamethoxazole-Trimethoprim23 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): 86.3 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).
Industry payments in 2024: $2,514.50
2 payments; by number, the most common kind was consulting fee; the largest payer was Mallinckrodt Hospital Products Inc. The 721 providers of this specialty with any payment received $13,778.35 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Dana-Farber Cancer Institute, Inc.Boston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Koreth among 117 hematology (internal medicine) physician records in Massachusetts
John Koreth, MBBS DPHIL is one of 117 hematology (internal medicine) physician records with a practice address in Massachusetts. 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 50% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1993 · median 2006 among the 77 with a school on file
- Record last updated2026 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology (Internal Medicine) Physician providers in Massachusetts
There are 117 hematology (internal medicine) physician records in Massachusetts.
All 117 in Massachusetts → Every provider in Boston → Hematology (Internal Medicine) Physician nationwide →
The 8 hematology (internal medicine) physician records with the nearest ZIP codes
- Joseph Antin, MDBoston, MA 022151861469249
- Nancy Berliner, MDBoston, MA 022151609855576
- Jorge Castillo, MDBoston, MA 022151689891129
- Joan Goldberg, MDBoston, MA 022151568558039
- Monique Hartley-Brown, M.D.Boston, MA 022151992904387
- Robin Marie Joyce, M.D.Boston, MA 022151659318350
- James Levine, M.D.Boston, MA 022151275573701
- Jessica Liegel, M.D.Boston, MA 022151700027000
Common questions
What is John Koreth, MBBS DPHIL's NPI number?
John Koreth, MBBS DPHIL's National Provider Identifier (NPI) is 1396706503, issued on Mar 29, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Koreth, MBBS DPHIL located?
The NPPES record lists a practice address at 450 Brookline Ave, Boston, MA, 02215. Phone: (617) 632-2949. Providers update this record themselves, so call before visiting.
How can I verify John Koreth, MBBS DPHIL's license?
NPPES lists Massachusetts license number 208706, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Koreth, MBBS DPHIL prescribe under Medicare Part D?
In 2024, John Koreth, MBBS DPHIL had 412 Medicare Part D claims for 59 beneficiaries; the average among hematology (internal medicine) physician prescribers was 496. Part D covers Medicare prescriptions only.
What is John Koreth, MBBS DPHIL's MIPS final score?
The 2023 MIPS final score is 86.3 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.