NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Maria Mercedes Mithlo, M.D.

Internal Medicine Physician in Elgin, OK · enumerated 2006 · practices at Duncan Regional Hospital, Inc.

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

National Provider Identifier

1356436851

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Registry record

Entity type Individual (Type 1)
Name Maria Mercedes Mithlo
Credential M.D.
Sex Female
Practice address 8148 State Highway 17, Elgin, OK, 73538
Phone (580) 454-2273
Enumeration date Oct 3, 2006
Last updated in NPPES Mar 17, 2023

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 21319 (OK) 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
100220880A Medicaid OK -

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

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 Maria Mithlo?
Maria Mithlo 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 2023-03-17.