Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael A Keller, M.D.

Colon & Rectal Surgery Physician in San Antonio, TX · enumerated 2007.

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

National Provider Identifier

1659572824

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael A Keller

Credential M.D.

Sex Male

Practice address 7950 Floyd Curl Dr Ste 101, Medical Tower I, San Antonio, TX, 78229

Phone (210) 614-0880

Enumeration date May 29, 2007

Last updated in NPPES May 10, 2018

Taxonomy & licenses

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License N5765 (TX) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
286241902	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Michael Keller?

Michael Keller is registered in NPPES with the primary taxonomy of Colon & Rectal Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-05-10.