NPI Portal NPI Lookup & Verification

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

Robert Michael Holbrook, M.D.

Gastroenterology Physician in Norman, OK · enumerated 2006.

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

National Provider Identifier

1053352054

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Registry record

Entity type Individual (Type 1)
Name Robert Michael Holbrook
Credential M.D.
Sex Male
Practice address Norman, OK, 73071
Phone (405) 366-8619
Fax (405) 366-1839
Enumeration date Jun 9, 2006
Last updated in NPPES Jun 13, 2011

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

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License 22135 (OK) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

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Frequently asked questions

What is the NPI number for Robert Holbrook?
The National Provider Identifier (NPI) for Robert Holbrook is 1053352054, a Type 1 (individual) record in the CMS NPPES registry.
Where does Robert Holbrook practice?
The practice location on file with NPPES is in Norman, OK. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-13.