Mert Rusen Gulsen, MD
NPI 1255129649 · Internal Medicine Physician · Cambridge, MA
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mert Rusen Gulsen, MD is a Internal Medicine Physician provider in Cambridge, MA (NPI 1255129649).
Provider details
- NPI number
- 1255129649
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 3018538 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
1 yr 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
Mailing address
Registry dates
- Enumerated
- 2025-04-28
- Last updated
- 2025-04-28
- Certified
- 2025-04-27
Frequently asked questions
- What is Mert Rusen Gulsen's NPI number?
- Mert Rusen Gulsen's National Provider Identifier (NPI) is 1255129649, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mert Rusen Gulsen's specialty?
- Mert Rusen Gulsen is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Mert Rusen Gulsen located?
- Mert Rusen Gulsen's practice location on file with NPPES is 330 Mount Auburn St, Cambridge, MA 02138-5597.
- What is Mert Rusen Gulsen's phone number?
- The practice phone number listed in the NPPES registry for Mert Rusen Gulsen is (646) 591-3823.
- Does Mert Rusen Gulsen accept Medicare?
- Mert Rusen Gulsen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mert Rusen Gulsen's NPI active?
- Yes — Mert Rusen Gulsen's NPI (1255129649) is active in the NPPES registry as of the last update on 2025-04-28.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.