Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Proto360, LLC

Q: What type of organization is Proto360, LLC?

Proto360, LLC is registered in NPPES as a Obesity Medicine (Preventive Medicine) Physician (its primary provider taxonomy).

Obesity Medicine (Preventive Medicine) Physician in Annapolis, MD · enumerated 2026 · authorized official Katrina Mattingly, Founding Partner.

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

National Provider Identifier

1043136526

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Registry record

Entity type Organization (Type 2)

Legal business name Proto360, LLC

Practice address 419 4th St, Annapolis, MD, 21403

Phone (410) 823-8243

Enumeration date Jun 29, 2026

Last updated in NPPES Jun 29, 2026

Taxonomy & classification

2083B0002X Obesity Medicine (Preventive Medicine) Physician Allopathic & Osteopathic Physicians Primary

261QU0200X Urgent Care Clinic/Center Ambulatory Health Care Facilities Secondary

Authorized official

Name Katrina Mattingly

Title Founding Partner

Phone (352) 339-3111

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 a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Proto360, LLC?

Proto360, LLC is registered in NPPES as a Obesity Medicine (Preventive Medicine) Physician (its primary provider taxonomy).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-29.