IndividualActive
William Blazek, M.D.
NPI 1659434561 · Internal Medicine Physician · Boston, MA
William Blazek, M.D. is a Internal Medicine Physician provider in Boston, MA (NPI 1659434561).
Provider details
- NPI number
- 1659434561
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 242173 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
Detailed profile(90/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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
780 Albany St
Boston Health Care for the Homeless Program
Boston, MA 02118-2524
Phone: (857) 654-1000
Fax: (857) 654-1100
Street-level locationGet directions
Mailing address
6 Sumner Rd
Cambridge, MA 02138-3015
Registry dates
- Enumerated
- 2006-12-19
- Last updated
- 2009-12-17
Frequently asked questions
- What is William Blazek's NPI number?
- William Blazek's National Provider Identifier (NPI) is 1659434561, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Blazek's specialty?
- William Blazek is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Blazek located?
- William Blazek's practice location on file with NPPES is 780 Albany St, Boston, MA 02118-2524.
- What is William Blazek's phone number?
- The practice phone number listed in the NPPES registry for William Blazek is (857) 654-1000.
- Is William Blazek's NPI active?
- Yes — William Blazek's NPI (1659434561) is active in the NPPES registry as of the last update on 2009-12-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.