Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Katherine Keller, DO
Specialist in Portland, ME · enumerated 2015.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1568854404
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Registry record
Entity type Individual (Type 1)
Name Katherine Keller
Credential DO
Sex Female
Practice address 51 Sewall St Ste 1, Portland, ME, 04102
Phone (207) 774-5761
Fax (207) 874-7478
Enumeration date Mar 2, 2015
Last updated in NPPES Jan 20, 2021
Taxonomy & licenses
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License TP17026 (ME) Secondary
207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 04324 (KY) Secondary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD.
About the DO 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
What specialty is Katherine Keller?
Katherine Keller is registered in NPPES with the primary taxonomy of Specialist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-01-20.