Mark Kiefner, PHD
NPI 1346457017 · Clinical Neuropsychologist · Portland, ME
Mark Kiefner, PHD is a Clinical Neuropsychologist provider in Portland, ME (NPI 1346457017).
Provider details
- NPI number
- 1346457017
- Entity type
- Individual
- Primary specialty
- Clinical NeuropsychologistBehavioral Health & Social Service Providers
- Credential
- PHD
- Sex
- Male
- Sole proprietor
- No
- License
- PS815 (ME)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
- 2007-05-16
- Last updated
- 2007-07-08
Frequently asked questions
- What is Mark Kiefner's NPI number?
- Mark Kiefner's National Provider Identifier (NPI) is 1346457017, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark Kiefner's specialty?
- Mark Kiefner is listed in the NPPES registry with a primary specialty of Clinical Neuropsychologist (Behavioral Health & Social Service Providers).
- Where is Mark Kiefner located?
- Mark Kiefner's practice location on file with NPPES is 26 Portland Street, Portland, ME 04101.
- What is Mark Kiefner's phone number?
- The practice phone number listed in the NPPES registry for Mark Kiefner is (207) 761-8402.
- Is Mark Kiefner's NPI active?
- Yes — Mark Kiefner's NPI (1346457017) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.