Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark F Doerner, M.D.

Internal Medicine Physician in Allen, TX · enumerated 2006.

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

National Provider Identifier

1922040872

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark F Doerner

Credential M.D.

Sex Male

Practice address 1111 Raintree Cir, Suite 240, Allen, TX, 75013

Phone (972) 908-3455

Fax (972) 908-3477

Enumeration date Jun 12, 2006

Last updated in NPPES Feb 25, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License L8045 (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
P00414826	Other	TX	RAILROAD MEDICARE

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 Mark Doerner?

Mark Doerner is registered in NPPES with the primary taxonomy of Internal Medicine 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-02-25.