Mark G Kiefner PHD LLC
NPI 1528539335 · Clinical Psychologist · Portland, ME
Mark G Kiefner PHD LLC is a Clinical Psychologist organization in Portland, ME (NPI 1528539335).
Provider details
- NPI number
- 1528539335
- Entity type
- Organization
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Organization subpart
- No
- Authorized official
- Mark Kiefner, Owner(207) 400-2694
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
7 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
- 2018-12-06
- Last updated
- 2018-12-06
Frequently asked questions
- What is Mark G Kiefner PHD LLC's NPI number?
- Mark G Kiefner PHD LLC's National Provider Identifier (NPI) is 1528539335, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Mark G Kiefner PHD LLC?
- Mark G Kiefner PHD LLC is classified in the NPPES registry as Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mark G Kiefner PHD LLC located?
- Mark G Kiefner PHD LLC's practice location on file with NPPES is 225 Commercial St Ste 403, Portland, ME 04101-6603.
- What is Mark G Kiefner PHD LLC's phone number?
- The practice phone number listed in the NPPES registry for Mark G Kiefner PHD LLC is (207) 400-2694.
- Who is the authorized official for Mark G Kiefner PHD LLC?
- The authorized official listed on Mark G Kiefner PHD LLC's NPPES record is Mark Kiefner, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Mark G Kiefner PHD LLC's NPI active?
- Yes — Mark G Kiefner PHD LLC's NPI (1528539335) is active in the NPPES registry as of the last update on 2018-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.