Justin Granstein, MD
NPI 1699169599 · Neurology Physician · Boston, MA
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Justin Granstein, MD is a Neurology Physician provider in Boston, MA (NPI 1699169599).
Provider details
- NPI number
- 1699169599
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 1015998 (MA)
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 tenure25% of score
11 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
293 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Ultrasonic Guidance for Blood Vessel Access76937 | 48 | $14 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 32 | $102 |
| Insertion of Tube Into Internal Neck Artery for Diagnosis Or Treatment With Review By Radiologist36224 | 31 | $457 |
| Insertion of Tube Into Brain Artery for Diagnosis Or Treatment With Review By Radiologist36226 | 30 | $272 |
| Insertion of Tube Into External Neck Artery for Diagnosis Or Treatment With Review By Radiologist36227 | 20 | $164 |
| Removal of Blood Clot and Injection to Dissolve Blood Clot From Head Artery Using Fluoroscopic Guidance61645 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,365 across 20 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (2)
- 200 S Manchester Ave Ste 210Orange, CA 92868-3211Phone: (714) 456-7495
- 101 the City Dr SOrange, CA 92868-3201Phone: (714) 880-7812
Registry dates
- Enumerated
- 2015-03-27
- Last updated
- 2023-07-20
- Certified
- 2023-07-20
Frequently asked questions
- What is Justin Granstein's NPI number?
- Justin Granstein's National Provider Identifier (NPI) is 1699169599, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Justin Granstein's specialty?
- Justin Granstein is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Justin Granstein located?
- Justin Granstein's practice location on file with NPPES is 110 Francis St Ste 3b, Boston, MA 02215-5501.
- What is Justin Granstein's phone number?
- The practice phone number listed in the NPPES registry for Justin Granstein is (617) 632-7246.
- Does Justin Granstein accept Medicare?
- Justin Granstein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Justin Granstein's NPI active?
- Yes — Justin Granstein's NPI (1699169599) is active in the NPPES registry as of the last update on 2023-07-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.