Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark A Greaves, RPH

Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist in Fenton, MO · enumerated 2013.

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

National Provider Identifier

1437599073

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Registry record

Entity type Individual (Type 1)

Name Mark A Greaves

Credential RPH

Sex Male

Practice address 450 Old Smizer Mill Rd, Fenton, MO, 63026

Phone (636) 349-2666

Fax (636) 530-3018

Enumeration date Jun 27, 2013

Last updated in NPPES Jun 27, 2013

Taxonomy & licenses

1835P0018X Pharmacist Clinician (PhC)/ Clinical Pharmacy Specialist Pharmacy Service Providers · License 042059 (MO) Primary

RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy. About the RPH 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

Is NPI 1437599073 active?

Yes, as of the latest NPPES snapshot, NPI 1437599073 is active (record last updated 2013-06-27).

How do I verify Mark Greaves's NPI record?

Cross-check NPI 1437599073 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-27.