Janet Chang, M.D.
NPI 1598705022 · Internal Medicine Physician · Wellesley, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Janet Chang, M.D. is a Internal Medicine Physician provider in Wellesley, MA (NPI 1598705022).
Provider details
- NPI number
- 1598705022
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 57263 (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
1,379 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 429 | $139 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 219 | $141 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 166 | $99 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 149 | $9 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 105 | $17 |
| Annual Depression Screening, 5 to 15 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 77 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 463 | 139 |
| Levothyroxine Sodium | 259 | 79 |
| Amlodipine Besylate | 244 | 61 |
| Rosuvastatin Calcium | 229 | 78 |
| Hydrochlorothiazide | 220 | 67 |
| Lisinopril | 201 | 61 |
| Losartan Potassium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2014-08-05
Frequently asked questions
- What is Janet Chang's NPI number?
- Janet Chang's National Provider Identifier (NPI) is 1598705022, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Janet Chang's specialty?
- Janet Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Janet Chang located?
- Janet Chang's practice location on file with NPPES is 195 Worcester St, Wellesley, MA 02481-5568.
- What is Janet Chang's phone number?
- The practice phone number listed in the NPPES registry for Janet Chang is (617) 219-1510.
- Does Janet Chang accept Medicare?
- Janet Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Janet Chang's NPI active?
- Yes — Janet Chang's NPI (1598705022) is active in the NPPES registry as of the last update on 2014-08-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.