Joseph Chang, M.D.
NPI 1518914274 · Emergency Medicine Physician · Winchester, MA
Enrolled with Medicare as Practitioner - Emergency Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Joseph Chang, M.D. is a Emergency Medicine Physician provider in Winchester, MA (NPI 1518914274).
Provider details
- NPI number
- 1518914274
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 217018 (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
20 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
484 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 | 208 | $182 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 66 | $71 |
| Critical Care, First 30-74 Minutes99291 | 60 | $224 |
| Emergency Department Visit With Moderate Level of Medical Decision Making99284 | 48 | $126 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 42 | $87 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 36 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 38 | 37 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 21 | 21 |
| Azithromycin | 20 | 20 |
| Doxycycline Hyclate | 19 | 19 |
| Cefpodoxime Proxetil | 17 | 17 |
| Tramadol Hcl | 14 | 14 |
| Prednisone | 12 | 12 |
These counts cover prescriptions paid through Medicare Part D in 2024 — they include 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 , 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
- 2006-05-28
- Last updated
- 2017-03-23
Frequently asked questions
- What is Joseph Chang's NPI number?
- Joseph Chang's National Provider Identifier (NPI) is 1518914274, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Joseph Chang's specialty?
- Joseph Chang is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Joseph Chang located?
- Joseph Chang's practice location on file with NPPES is 41 Highland Ave, Winchester, MA 01890.
- What is Joseph Chang's phone number?
- The practice phone number listed in the NPPES registry for Joseph Chang is (781) 729-9000.
- Does Joseph Chang accept Medicare?
- Joseph Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Joseph Chang's NPI active?
- Yes — Joseph Chang's NPI (1518914274) is active in the NPPES registry as of the last update on 2017-03-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.