William Portner, M.D.
NPI 1861489130 · Diagnostic Radiology Physician · Norway, ME
William Portner, M.D. is a Diagnostic Radiology Physician provider in Norway, ME (NPI 1861489130).
Provider details
- NPI number
- 1861489130
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 013618 (ME)
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
- 2005-10-03
- Last updated
- 2007-07-16
Frequently asked questions
- What is William Portner's NPI number?
- William Portner's National Provider Identifier (NPI) is 1861489130, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Portner's specialty?
- William Portner is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is William Portner located?
- William Portner's practice location on file with NPPES is 181 Main St, Norway, ME 04268-5648.
- What is William Portner's phone number?
- The practice phone number listed in the NPPES registry for William Portner is (207) 743-5933.
- Is William Portner's NPI active?
- Yes — William Portner's NPI (1861489130) is active in the NPPES registry as of the last update on 2007-07-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.