Jillian Grigoryan-Koster, M.D.
NPI 1225419385 · Hospitalist Physician · Concord, NH
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jillian Grigoryan-Koster, M.D. is a Hospitalist Physician provider in Concord, NH (NPI 1225419385).
Provider details
- NPI number
- 1225419385
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 18862 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
11 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
772 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 50 Minutes99233 | 371 | $116 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 180 | $77 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 86 | $113 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 56 | $167 |
| Subsequent Hospital Care With Straightforward Or Low Level of Medical Decision Making, Per Day, If Using Time, at Least 25 Minutes99231 | 43 | $48 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2015-06-15
- Last updated
- 2018-09-12
Frequently asked questions
- What is Jillian Grigoryan-Koster's NPI number?
- Jillian Grigoryan-Koster's National Provider Identifier (NPI) is 1225419385, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jillian Grigoryan-Koster's specialty?
- Jillian Grigoryan-Koster is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Jillian Grigoryan-Koster located?
- Jillian Grigoryan-Koster's practice location on file with NPPES is 250 Pleasant St, Concord, NH 03301.
- What is Jillian Grigoryan-Koster's phone number?
- The practice phone number listed in the NPPES registry for Jillian Grigoryan-Koster is (603) 227-7000.
- Does Jillian Grigoryan-Koster accept Medicare?
- Jillian Grigoryan-Koster is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jillian Grigoryan-Koster's NPI active?
- Yes — Jillian Grigoryan-Koster's NPI (1225419385) is active in the NPPES registry as of the last update on 2018-09-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.