April John Tambaoan Mercado, NP

Primary specialty

Nurse PractitionerTaxonomy code 363L00000X

License

R213903 Issued in MD

Practice address

1562 Opossumtown Pike
Frederick, MD 21702-4337

Phone

(240) 215-6310

Fax

(240) 566-7754

NPI assigned

Feb 9, 2022

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in MD, DC2 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 2

Specialty

Nurse Practitioner

Education

Other, 2021

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Washington Nephrology Associates LLPGroup PAC ID 8527951318, 31 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: amercado40758@direct.acumenmd.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• Washington Nephrology Associates, L.L.P.

  • Nephrology Physician
  • Rockville, MD
  • NPI 1124193479

  DC

  Medicare reassignment Care Compare group NPD
• Branislav S Romanic MD LLC

  • Nephrology Physician
  • Frederick, MD
  • NPI 1033383666
  Medicare reassignment NPD
• Mark E Burton, DPM PC

  • Podiatrist
  • Yardley, PA
  • NPI 1134163801
  NPD
• Frederick Health Hospital Inc

  • General Acute Care Hospital
  • Frederick, MD
  • NPI 1538165527
  NPD (past)

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1644364800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783987200000",
    "number": "1497409452",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1 FREDERICK HEALTH WAY",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217019435"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1562 OPOSSUMTOWN PIKE",
            "city": "FREDERICK",
            "state": "MD",
            "postal_code": "217024337",
            "telephone_number": "240-215-6310",
            "fax_number": "240-566-7754"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MERCADO",
        "first_name": "APRIL JOHN",
        "middle_name": "TAMBAOAN",
        "name_prefix": "Mr.",
        "credential": "NP",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-02-09",
        "last_updated": "2026-07-14",
        "certification_date": "2026-07-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363L00000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner",
            "state": "MD",
            "license": "R213903",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Mental Health Assoc. of Frederick Country, Counseling Services
• Mental Health Association of Frederick County
• Mental Shift Wellness
• Mentor-Maryland
• Antonia Mentzer
• Courteny Christine Mercer
• Julie Wood Merchant, MA, ATR-BC, CPP
• Mercy Seat Medical, LLC
• Emily Benjamin Merdoc, MED, LGPC, NBCC
• Meritus Medical Center Inc

• Nurse Practitioner in Frederick, MD
• Providers in Frederick, MD by specialty
• Nurse Practitioner in Maryland

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 14, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.