Mary Chang, D.O.
NPI 1407870389 · Obstetrics & Gynecology Physician · Haverhill, MA
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary Chang, D.O. is a Obstetrics & Gynecology Physician provider in Haverhill, MA (NPI 1407870389).
Provider details
- NPI number
- 1407870389
- Entity type
- Individual
- Primary specialty
- Obstetrics & Gynecology PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Female
- Sole proprietor
- No
- License
- K1390 (TX)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-26
- Last updated
- 2021-10-18
- Certified
- 2021-10-18
Frequently asked questions
- What is Mary Chang's NPI number?
- Mary Chang's National Provider Identifier (NPI) is 1407870389, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary Chang's specialty?
- Mary Chang is listed in the NPPES registry with a primary specialty of Obstetrics & Gynecology Physician (Allopathic & Osteopathic Physicians).
- Where is Mary Chang located?
- Mary Chang's practice location on file with NPPES is 600 Primrose St Ste 202, Haverhill, MA 01830-2659.
- What is Mary Chang's phone number?
- The practice phone number listed in the NPPES registry for Mary Chang is (978) 556-1000.
- Does Mary Chang accept Medicare?
- Mary Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mary Chang's NPI active?
- Yes — Mary Chang's NPI (1407870389) is active in the NPPES registry as of the last update on 2021-10-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.