IndividualActive
Claus Simonsen, MD, PHD
NPI 1649400276 · Neurology Physician · Boston, MA
Claus Simonsen, MD, PHD is a Neurology Physician provider in Boston, MA (NPI 1649400276).
Provider details
- NPI number
- 1649400276
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD, PHD
- Sex
- Male
- Sole proprietor
- No
- License
- L-240559 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(85/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
16 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Massachusetts General Hospital
55 Fruit Street
Boston, MA 02114
Phone: (617) 726-2066
Approximate (ZIP-level) locationGet directions
Mailing address
Massachusetts General Hospital
Boston, MA 02114
Registry dates
- Enumerated
- 2009-07-16
- Last updated
- 2009-07-16
Frequently asked questions
- What is Claus Simonsen's NPI number?
- Claus Simonsen's National Provider Identifier (NPI) is 1649400276, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Claus Simonsen's specialty?
- Claus Simonsen is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Claus Simonsen located?
- Claus Simonsen's practice location on file with NPPES is Massachusetts General Hospital, Boston, MA 02114.
- What is Claus Simonsen's phone number?
- The practice phone number listed in the NPPES registry for Claus Simonsen is (617) 726-2066.
- Is Claus Simonsen's NPI active?
- Yes — Claus Simonsen's NPI (1649400276) is active in the NPPES registry as of the last update on 2009-07-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.