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

Dr. Mark Abraham Greig, O.M.D

Acupuncturist in Clearwater, FL · enumerated 2014.

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

National Provider Identifier

1134537913

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark Abraham Greig

Credential O.M.D

Sex Male

Practice address Clearwater, FL, 33765

Phone (727) 223-8911

Fax (727) 223-8917

Enumeration date Jul 24, 2014

Last updated in NPPES Jul 24, 2014

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

Taxonomy & licenses

171100000X Acupuncturist Other Service Providers · License AP2097 (FL) 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

Is NPI 1134537913 active?

Yes, as of the latest NPPES snapshot, NPI 1134537913 is active (record last updated 2014-07-24).

How do I verify Mark Greig's NPI record?

Cross-check NPI 1134537913 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-07-24.