Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Michael Rolf Karlfeldt, PHD
Naturopath in Boise, ID · enumerated 2013.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1508205493
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Registry record
Entity type Individual (Type 1)
Name Michael Rolf Karlfeldt
Credential PHD
Sex Male
Practice address 5010 W Cassia St, Boise, ID, 83705
Phone (208) 338-8902
Fax (208) 693-8456
Enumeration date Jun 24, 2013
Last updated in NPPES Jun 24, 2013
Taxonomy & licenses
PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers.
About the PHD credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Is NPI 1508205493 active?
Yes, as of the latest NPPES snapshot, NPI 1508205493 is active (record last updated 2013-06-24).
How do I verify Michael Karlfeldt's NPI record?
Cross-check NPI 1508205493 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-24.