Jillian C. Grigoryan-Koster, M.D.
Hospitalist Physician · Concord, NH
Jillian C. Grigoryan-Koster, M.D. is a hospitalist physician with a practice address in Concord, New Hampshire, and NPI 1225419385, issued on Jun 15, 2015. Check the license (New Hampshire 18862, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Jillian C. Grigoryan-Koster
- Credential
- M.D.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License number
- 18862 NH
Self-reported in NPPES; status is on the state search - Practice location
- 250 Pleasant St, Concord, NH 03301
- Phone
- (603) 227-7000
- Enumerated
- Jun 15, 2015
- Record last updated
- Sep 12, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (603) 227-7191
- Medicare enrollment
- Enrolled (PECOS I20181011001083); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 132 in New Hampshire → Look up another NPI →
Also registered at 250 Pleasant St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Abdalla, DOHospitalist Physician1013279504
- Ruba Abdullah, MDFamily Medicine Physician1336871524
- Arthur Ablayev, MDHospitalist Physician1598178881
- Judith Ainsworth, APRNFamily Nurse Practitioner1023473881
- D. Akey, MDPulmonary Disease Physician1629015995
- Mathew AllardStudent in an Organized Health Care Education/Training Program1477499515
Verify Jillian C. Grigoryan-Koster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 18862Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average hospitalist physician in 2024
148 Medicare Part D claims for 73 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of 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 MIPS final score for 2023 (Medicare payment program): 89.4 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Concord Hospital IncConcord, NH
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jillian C. Grigoryan-Koster among 132 hospitalist physician records in New Hampshire
Jillian C. Grigoryan-Koster, M.D. is one of 132 hospitalist physician records with a practice address in New Hampshire. 94% 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 69% of them.
- NPI issued2015 · 69% of these records are older, 21% newer
- In a Medicare fileYes · 94% of these records are
- In the CMS Doctors and Clinicians fileYes · 86% of these records are
- Graduated2015 · median 2006 among the 113 with a school on file
- Record last updated2018 · 59% 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 Hampshire 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 Hampshire
There are 132 hospitalist physician records in New Hampshire.
All 132 in New Hampshire → Every provider in Concord → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Tomasz Blaszczak, MDConcord, NH 033011548270804
- John Fulton, DOConcord, NH 033011962433284
- Jimmy Fune, MDConcord, NH 033011194934943
- Alexander Gadbois, MDConcord, NH 033011073553558
- Toni Hadjiev, M.D.Concord, NH 033011780830901
- Klevis Kadiqi, MDConcord, NH 033011609983782
- Mustapha Karanouh, MDConcord, NH 033011497960504
- Christina Kirkpatrick, MDConcord, NH 033011578664108
Common questions
What is Jillian C. Grigoryan-Koster, M.D.'s NPI number?
Jillian C. Grigoryan-Koster, M.D.'s National Provider Identifier (NPI) is 1225419385, issued on Jun 15, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Jillian C. Grigoryan-Koster, M.D. located?
The NPPES record lists a practice address at 250 Pleasant St, Concord, NH, 03301. Phone: (603) 227-7000. Providers update this record themselves, so call before visiting.
How can I verify Jillian C. Grigoryan-Koster, M.D.'s license?
NPPES lists New Hampshire license number 18862, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jillian C. Grigoryan-Koster, M.D. prescribe under Medicare Part D?
In 2024, Jillian C. Grigoryan-Koster, M.D. had 148 Medicare Part D claims for 73 beneficiaries; the average among hospitalist physician prescribers was 521. Part D covers Medicare prescriptions only.
What is Jillian C. Grigoryan-Koster, M.D.'s MIPS final score?
The 2023 MIPS final score is 89.4 of 100. 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.