Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Derek R Libby, DO

Addiction Medicine (Preventive Medicine) Physician in Portland, ME · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1184815730

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Registry record

Entity type Individual (Type 1)

Name Dr. Derek R Libby

Credential DO

Sex Male

Practice address Portland, ME, 04101

Phone (207) 773-3335

Fax (207) 774-4788

Enumeration date Aug 8, 2007

Last updated in NPPES Sep 23, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

204D00000X Neuromusculoskeletal Medicine & OMM Physician Allopathic & Osteopathic Physicians · License 1967 (ME) Secondary

2083A0300X Addiction Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians · License DO1967 (ME) Primary

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.

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Frequently asked questions

How do I verify Derek Libby's NPI record?

Cross-check NPI 1184815730 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1184815730 active?

Yes, as of the latest NPPES snapshot, NPI 1184815730 is active (record last updated 2022-09-23).

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Jeffrey Barkin Psychiatry Physician · Portland, ME NPI 1457391989 Julia Colpitts Clinical Social Worker · Portland, ME NPI 1265692164 Rebecca Thompson Psychiatric/Mental Health Nurse Practitioner · Portland, ME NPI 1598902801

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-09-23.