Stephanie Sinayuk, M.D.
NPI 1588959456 · Emergency Medicine Physician · Worcester, MA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Stephanie Sinayuk, M.D. is a Emergency Medicine Physician provider in Worcester, MA (NPI 1588959456).
Provider details
- NPI number
- 1588959456
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 249310 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
15 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
111 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. 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 does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Emergency Department Visit With High Level of Medical Decision Making99285 | 66 | $179 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 29 | $123 |
| Critical Care, First 30-74 Minutes99291 | 16 | $219 |
Typical Medicare-allowed amounts for these services range $123–$219 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (1)
- 115 Lincoln StFramingham, MA 01702-6358Phone: (508) 383-1000
Registry dates
- Enumerated
- 2011-06-18
- Last updated
- 2026-01-07
- Certified
- 2026-01-07
Frequently asked questions
- What is Stephanie Sinayuk's NPI number?
- Stephanie Sinayuk's National Provider Identifier (NPI) is 1588959456, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Stephanie Sinayuk's specialty?
- Stephanie Sinayuk is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Stephanie Sinayuk located?
- Stephanie Sinayuk's practice location on file with NPPES is 55 Lake Ave N, Worcester, MA 01655-0002.
- What is Stephanie Sinayuk's phone number?
- The practice phone number listed in the NPPES registry for Stephanie Sinayuk is (508) 334-1000.
- Does Stephanie Sinayuk accept Medicare?
- Stephanie Sinayuk is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Stephanie Sinayuk's NPI active?
- Yes — Stephanie Sinayuk's NPI (1588959456) is active in the NPPES registry as of the last update on 2026-01-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.