Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Guy H Grayson MD PA

Pediatric Hematology & Oncology Physician in Harlingen, TX · enumerated 2007 · authorized official Guy Grayson, President.

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

National Provider Identifier

1891991410

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Registry record

Entity type Organization (Type 2)

Legal business name Guy H Grayson MD PA

Other name <Unavail>

Practice address 1911 Lubbock St, Suite C, Harlingen, TX, 78550

Phone (866) 242-0010

Fax (956) 365-4423

Enumeration date Jun 21, 2007

Last updated in NPPES Jul 28, 2008

Taxonomy & classification

2080P0207X Pediatric Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License J0507 (TX) Primary

Authorized official

Name Guy Grayson

Title President

Phone (956) 365-4419

Other identifiers

Identifier	Type	State	Issuer
134968009	Medicaid	TX	-
154945301	Medicaid	TX	-

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.

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Frequently asked questions

Where is Guy H Grayson MD PA located?

The practice location on file with NPPES is in Harlingen, TX.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2008-07-28. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Kathleen Brace Gaul Podiatrist · Harlingen, TX NPI 1689670564 Guy Grayson Pediatric Hematology & Oncology Physician · Harlingen, TX NPI 1598705030

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-07-28.