Mark Sivak, M.D.
NPI 1417928896 · Neurology Physician · New York, NY
Enrolled with Medicare as Practitioner - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark Sivak, M.D. is a Neurology Physician provider in New York, NY (NPI 1417928896).
Provider details
- NPI number
- 1417928896
- Entity type
- Individual
- Primary specialty
- Neurology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 114630 (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.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) |
|---|---|
| Immune Globul G/Gly/Iga Avg 46brand: Gamunex-C | 11 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-01
- Last updated
- 2011-05-04
Frequently asked questions
- What is Mark Sivak's NPI number?
- Mark Sivak's National Provider Identifier (NPI) is 1417928896, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Sivak's specialty?
- Mark Sivak is listed in the NPPES registry with a primary specialty of Neurology Physician (Allopathic & Osteopathic Physicians).
- Where is Mark Sivak located?
- Mark Sivak's practice location on file with NPPES is 5 East 98 St, 7th Floor, New York, NY 10029-6501.
- What is Mark Sivak's phone number?
- The practice phone number listed in the NPPES registry for Mark Sivak is (212) 241-7076.
- Does Mark Sivak accept Medicare?
- Mark Sivak is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mark Sivak's NPI active?
- Yes — Mark Sivak's NPI (1417928896) is active in the NPPES registry as of the last update on 2011-05-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.