Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Macy Martinson, MD

Nephrology Physician in Hilo, HI · enumerated 2010.

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

National Provider Identifier

1881919348

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Registry record

Entity type Individual (Type 1)

Name Macy Martinson

Credential MD

Sex Female

Practice address 633 Ponahawai St Ste 103, Hilo, HI, 96720

Phone (808) 481-2300

Fax (808) 481-2301

Enumeration date Mar 28, 2010

Last updated in NPPES Sep 25, 2025

Taxonomy & licenses

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License MD171945 (OR) Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License MD60548636 (WA) Secondary

207RN0300X Nephrology Physician Allopathic & Osteopathic Physicians · License MD-23479 (HI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Macy Martinson?

The National Provider Identifier (NPI) for Macy Martinson is 1881919348, a Type 1 (individual) record in the CMS NPPES registry.

Where does Macy Martinson practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-09-25.