William Mainker, M.D.
NPI 1922332238 · Internal Medicine Physician · Springfield, NJ
William Mainker, M.D. is a Internal Medicine Physician provider in Springfield, NJ (NPI 1922332238).
Provider details
- NPI number
- 1922332238
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 25MA02323400 (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
16 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
- 2009-09-21
- Last updated
- 2009-09-21
Frequently asked questions
- What is William Mainker's NPI number?
- William Mainker's National Provider Identifier (NPI) is 1922332238, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Mainker's specialty?
- William Mainker is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is William Mainker located?
- William Mainker's practice location on file with NPPES is 18 Oak Rdg, Springfield, NJ 07081-3719.
- What is William Mainker's phone number?
- The practice phone number listed in the NPPES registry for William Mainker is (908) 277-3675.
- Is William Mainker's NPI active?
- Yes — William Mainker's NPI (1922332238) is active in the NPPES registry as of the last update on 2009-09-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.