Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Katherine Marie Mercy, MD

MOHS-Micrographic Surgery Physician in Naperville, IL · enumerated 2008 · practices at Forefront Dermatology, S.C..

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

National Provider Identifier

1134385255

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Registry record

Entity type Individual (Type 1)

Name Dr. Katherine Marie Mercy

Credential MD

Sex Female

Practice address 1520 Bond St, Naperville, IL, 60563

Phone (630) 357-7536

Fax (630) 904-0413

Enumeration date Jul 29, 2008

Last updated in NPPES Jul 25, 2022

Taxonomy & licenses

207ND0101X MOHS-Micrographic Surgery Physician Allopathic & Osteopathic Physicians · License 036.127624 (IL) Primary

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 036.127624 (IL) Secondary

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 0101262264 (VA) Secondary

207ND0101X MOHS-Micrographic Surgery Physician Allopathic & Osteopathic Physicians · License 0101262264 (VA) Secondary

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

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

Where does Katherine Mercy practice?

The practice location on file with NPPES is in Naperville, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Katherine Mercy?

The National Provider Identifier (NPI) for Katherine Mercy is 1134385255, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Forefront Dermatology, S.C. Dermatology Physician · Naperville, IL NPI 1376915629

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-25.