Zachary Spiwak, PA-C
NPI 1134910920 · Physician Assistant · Boston, MA
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Zachary Spiwak, PA-C is a Physician Assistant provider in Boston, MA (NPI 1134910920).
Provider details
- NPI number
- 1134910920
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- PA-C
- Sex
- Male
- Sole proprietor
- No
- License
- PA101732 (MA)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
- 2025-05-13
- Last updated
- 2025-09-03
- Certified
- 2025-09-03
Frequently asked questions
- What is Zachary Spiwak's NPI number?
- Zachary Spiwak's National Provider Identifier (NPI) is 1134910920, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Zachary Spiwak's specialty?
- Zachary Spiwak is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Zachary Spiwak located?
- Zachary Spiwak's practice location on file with NPPES is 300 Longwood Ave, Boston, MA 02115-5724.
- What is Zachary Spiwak's phone number?
- The practice phone number listed in the NPPES registry for Zachary Spiwak is (617) 355-6000.
- Does Zachary Spiwak accept Medicare?
- Zachary Spiwak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Zachary Spiwak's NPI active?
- Yes — Zachary Spiwak's NPI (1134910920) is active in the NPPES registry as of the last update on 2025-09-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.