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Summation Group LLC

Q: What type of organization is Summation Group LLC?

Summation Group LLC is registered in NPPES as a Radiation Oncology Physician (its primary provider taxonomy).

Radiation Oncology Physician in Claremore, OK · enumerated 2007 · authorized official Van Woo, Sole Owner.

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

National Provider Identifier

1689712457

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Registry record

Entity type Organization (Type 2)

Legal business name Summation Group LLC

Practice address 1501 N Florence, Suite 191, Claremore, OK, 74017

Phone (918) 283-9900

Fax (918) 283-9911

Enumeration date Feb 2, 2007

Last updated in NPPES Aug 22, 2020

Taxonomy & classification

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Van Woo

Title Sole Owner

Phone (918) 283-9900

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 type of organization is Summation Group LLC?

Summation Group LLC is registered in NPPES as a Radiation Oncology Physician (its primary provider taxonomy).

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-08-22.