William Macmillan, M.D.
NPI 1326015025 · Maternal & Fetal Medicine Physician · New Brunswick, NJ
Enrolled with Medicare as Practitioner - Obstetrics/Gynecology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Macmillan, M.D. is a Maternal & Fetal Medicine Physician provider in New Brunswick, NJ (NPI 1326015025).
Provider details
- NPI number
- 1326015025
- Entity type
- Individual
- Primary specialty
- Maternal & Fetal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 25MA07852600 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 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
- 2006-03-02
- Last updated
- 2008-09-23
Frequently asked questions
- What is William Macmillan's NPI number?
- William Macmillan's National Provider Identifier (NPI) is 1326015025, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Macmillan's specialty?
- William Macmillan is listed in the NPPES registry with a primary specialty of Maternal & Fetal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Macmillan located?
- William Macmillan's practice location on file with NPPES is 125 Paterson St, New Brunswick, NJ 08901-1962.
- What is William Macmillan's phone number?
- The practice phone number listed in the NPPES registry for William Macmillan is (732) 235-6633.
- Does William Macmillan accept Medicare?
- William Macmillan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Macmillan's NPI active?
- Yes — William Macmillan's NPI (1326015025) is active in the NPPES registry as of the last update on 2008-09-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.