Mark Graber, MD
NPI 1568437218 · Nephrology Physician · Northport, NY
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Graber, MD is a Nephrology Physician provider in Northport, NY (NPI 1568437218).
Provider details
- NPI number
- 1568437218
- Entity type
- Individual
- Primary specialty
- Nephrology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 147814 (NY)
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
20 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
Mailing address
Registry dates
- Enumerated
- 2006-02-17
- Last updated
- 2007-07-12
Frequently asked questions
- What is Mark Graber's NPI number?
- Mark Graber's National Provider Identifier (NPI) is 1568437218, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Graber's specialty?
- Mark Graber is listed in the NPPES registry with a primary specialty of Nephrology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Graber located?
- Mark Graber's practice location on file with NPPES is Middleville Road, Northport, NY 11768.
- What is Mark Graber's phone number?
- The practice phone number listed in the NPPES registry for Mark Graber is (631) 261-4400.
- Does Mark Graber accept Medicare?
- Mark Graber is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Graber's NPI active?
- Yes — Mark Graber's NPI (1568437218) is active in the NPPES registry as of the last update on 2007-07-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.