MARK GREGORY KIEFNER (PHD) – Clinical Neuropsychologist, NPI 1346457017

MARK GREGORY KIEFNER (PHD) is a healthcare provider. based in Portland, Maine. specializing in Clinical Neuropsychologist. They hold the professional credentials PHD. They hold a License No. PS815 (ME). The NPI Number for MARK GREGORY KIEFNER (PHD) is 1346457017

Main info

Male
Name
MARK GREGORY KIEFNER (PHD)
NPI
1346457017
Phone
(207) 774-6323
Address
PO BOX 8600
Enumeration Date
16 May 2007
Last Update Date
8 July 2007
Data current as of
19 May 2026

Profile Insights

NPPES metrics only — not quality of care.

Methodology
Experience52
Completeness75
Years active:19State licenses:1Digital endpointsOther names

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Provider Addresses for MARK GREGORY KIEFNER (PHD)

  • 8600, Southwest Gayle Lane, Portland, Metro, Washington County, Oregon, 97225, United States

    PORTLAND, ME 04104

    Phone: (207) 774-6323

    Fax: (207) 761-8460

    Type: Mailing

  • 26, Portland Street, Old Port, Downtown, Portland, Cumberland County, Maine, 04101, United States

    PORTLAND, ME 04101

    Phone: (207) 761-8402

    Fax: (207) 761-8405

    Type: Location

NPPES updates history

No NPPES updates recorded for this provider.

Prescription Activity

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Open Payments (CMS)

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Medicare Enrollment & Revalidation

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Medicare Utilization (FFS)

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No Medicare fee-for-service utilization data available for this provider in our database.

Insurance plans in this area (ZIP 04104)

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Frequently asked questions

What is the 10-digit NPI for MARK GREGORY KIEFNER (PHD)?
MARK GREGORY KIEFNER (PHD) — NPI 1346457017 — is the standard way to identify this listing.
Can I rely on MARK GREGORY KIEFNER (PHD) being an active provider?
As of the registry snapshot, MARK GREGORY KIEFNER (PHD) is marked active.
What is MARK GREGORY KIEFNER (PHD)'s specialty?
The listing groups MARK GREGORY KIEFNER (PHD) with Clinical Neuropsychologist. Clinical services aligned with this taxonomy classification.
What address line appears for MARK GREGORY KIEFNER (PHD)?
MARK GREGORY KIEFNER (PHD)'s geographic hint is Portland, Maine in our summary view.
Why does MARK GREGORY KIEFNER (PHD) have multiple addresses?
2 practice locations appear in the available data. Multiple addresses are common for hospital privileges, telehealth, or multi-site groups.

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