Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Abigail De Guzman, D.O.

Internal Medicine Physician in Knoxville, TN · enumerated 2008.

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

National Provider Identifier

1427219302

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Registry record

Entity type Individual (Type 1)

Name Dr. Abigail De Guzman

Credential D.O.

Sex Female

Practice address 2240 Sutherland Ave, Suite 104, Knoxville, TN, 37919

Phone (865) 909-0090

Fax (865) 909-9883

Enumeration date Jun 23, 2008

Last updated in NPPES May 31, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 1996 (TN) 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
1520000	Medicaid	TN	-

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 Abigail De Guzman?

Abigail De Guzman 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 2011-05-31.