Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Henry Calvin Martensen III, PA-C

Physician Assistant in South Portland, ME · enumerated 2016.

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

National Provider Identifier

1669836300

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Registry record

Entity type Individual (Type 1)

Name Mr. Henry Calvin Martensen III

Credential PA-C

Sex Male

Practice address 119 Gannett Dr, South Portland, ME, 04106

Phone (207) 781-1551

Enumeration date Apr 8, 2016

Last updated in NPPES Jul 16, 2021

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA2229 (ME) Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 0010-06360 (NC) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Henry Martensen?

The National Provider Identifier (NPI) for Henry Martensen is 1669836300, a Type 1 (individual) record in the CMS NPPES registry.

Where does Henry Martensen practice?

The practice location on file with NPPES is in South Portland, ME. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-16.