Cynthia Stein, M.D.
NPI 1255378899 · Sports Medicine (Internal Medicine) Physician · Boston, MA
Enrolled with Medicare as Practitioner - Sports Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Cynthia Stein, M.D. is a Sports Medicine (Internal Medicine) Physician provider in Boston, MA (NPI 1255378899).
Provider details
- NPI number
- 1255378899
- Entity type
- Individual
- Primary specialty
- Sports Medicine (Internal Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 208003 (MA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
111 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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) |
|---|---|---|
| Aspiration And/Or Injection of Fluid From Large Joint20610 | 61 | $88 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 36 | $94 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 14 | $140 |
Typical Medicare-allowed amounts for these services range $88–$140 (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.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$15 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-01
- Last updated
- 2008-05-19
Frequently asked questions
- What is Cynthia Stein's NPI number?
- Cynthia Stein's National Provider Identifier (NPI) is 1255378899, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Cynthia Stein's specialty?
- Cynthia Stein is listed in the NPPES registry with a primary specialty of Sports Medicine (Internal Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Cynthia Stein located?
- Cynthia Stein's practice location on file with NPPES is 319 Longwood Ave, Boston, MA 02115-5728.
- What is Cynthia Stein's phone number?
- The practice phone number listed in the NPPES registry for Cynthia Stein is (617) 355-3501.
- Does Cynthia Stein accept Medicare?
- Cynthia Stein is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Cynthia Stein's NPI active?
- Yes — Cynthia Stein's NPI (1255378899) is active in the NPPES registry as of the last update on 2008-05-19.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.