NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Keith Ackerman, D.O.

Internal Medicine Physician in Warrenton, VA · enumerated 2006 · practices at Warrenton Medical Associates,PC.

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

National Provider Identifier

1174687917

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Registry record

Entity type Individual (Type 1)
Name Dr. Michael Keith Ackerman
Credential D.O.
Sex Male
Practice address 555 Hospital Dr, Warrenton, VA, 20186
Phone (540) 347-5512
Fax (540) 341-4646
Enumeration date Dec 19, 2006
Last updated in NPPES Mar 18, 2014

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 0102050260 (VA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier Type State Issuer
885926 Other VA MAMSI PROVIDER NUMBER
8195981 Other VA CIGNA PROVIDER NUMBER
2473397 Other VA AETNA PROVIDER NUMBER
5846838 Medicaid VA -
274674 Other VA ANTHEM PROVIDER NUMBER
060860000 Other VA SOUTHERN HEALTH PROVIDER
50820004 Other DC CAREFIRST PROVIDER NUMBER

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

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.
What specialty is Michael Ackerman?
Michael Ackerman 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-03-18.