Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. April John Tambaoan Mercado, NP

Nurse Practitioner in Frederick, MD · enumerated 2022.

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

National Provider Identifier

1497409452

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Registry record

Entity type Individual (Type 1)

Name Mr. April John Tambaoan Mercado

Credential NP

Sex Male

Practice address 1562 Opossumtown Pike, Frederick, MD, 21702

Phone (240) 215-6310

Fax (240) 566-7754

Enumeration date Feb 9, 2022

Last updated in NPPES Jul 14, 2026

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License R213903 (MD) Primary

NP · Nurse Practitioner: An advanced practice registered nurse with graduate training, licensed to diagnose and treat, often with prescriptive authority. About the NP 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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is April John Mercado?

April John Mercado is registered in NPPES with the primary taxonomy of Nurse Practitioner. 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 2026-07-14.