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April John Tambaoan Mercado , NP

Nurse Practitioner β€’ Frederick, MD

Active NPI 1497409452 Individual Practitioner Male Practitioner Accepts Medicare assignment
Practice location in NPPES

1562 Opossumtown Pike
Frederick, MD 217024337

Call 2402156310 Location details and other listings
Medical Disclaimer

This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.

Practice Location & Contact Primary Location

Practice Address

1562 Opossumtown Pike

Frederick, MD 217024337

Telephone 2402156310
Fax 2405667754
Organization at the Same NPPES Address or Phone
Frederick Health Hospital Inc Facility NPI 1982600771

Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.

Other Listings in Public Data

CMS Doctors and Clinicians lists 2 distinct group names: Frederick Health Medical Group Llc; Washington Nephrology Associates Llp. See the list

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.

Listings do not confirm current availability, employment or a shared ownership network.

Medicare Profile & Education

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026

Graduation Year

2021

30-day fills

411 standardized 30-day fills in 2024

CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.

What this does not show: 30-day fills

It is not a count of patients and not a measure of quality.

Part D drug cost

$105,225 in 2024

The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.

What this does not show: Part D drug cost

A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.

Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.

Industry payments (Open Payments)

Fewer than 11 payment records totaling $15.50 in 2024

Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.

These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.

General: payments not tied to research, such as meals, travel, consulting or speaking fees.

A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.

Source: CMS Open Payments, program year 2024.

Guide: How to read an Open Payments record

Years since graduation

5 years (graduated 2021)

CMS Doctors and Clinicians data list 2021 as the year this clinician finished professional school.

What this does not show: Years since graduation

It is not the number of years in practice, and more years does not mean better care.

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026.

NPI first issued

2022

The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.

What this does not show: NPI first issued

NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.

Source: CMS NPPES NPI Registry.

Accepts Medicare assignment

CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.

Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.

Source: CMS Doctors and Clinicians, CMS release of October 2, 2026; Medicare.gov, β€œDoes your provider accept Medicare as full payment?”

Guide: What Medicare assignment means

No telehealth indicator

CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.

Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians, CMS release of October 2, 2026.

Guide: How Medicare covers telehealth

Enrolled in Medicare (PECOS)

April John Mercado has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.

It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What Medicare enrollment (PECOS) means

Can order Medicare-covered services

CMS lists April John Mercado as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.

What this does not show: Can order Medicare-covered services

It does not mean the clinician offers these services directly.

Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.

Guide: What ordering and referring status means

Compared with the same specialty in Frederick and Maryland

Billing and prescribing volume is not a quality rating.

Medicare Part D prescriptions

Close to the middle for clinicians listed under Nurse Practitioner in Frederick, MD (2024, 18 clinicians with data). Median for this group: 272. Middle half: 101 to 825.

Close to the middle for clinicians listed under Nurse Practitioner in Maryland (2024, 506 clinicians with data). Median for this group: 317. Middle half: 87 to 1,029.

Part D drug cost

A higher Part D drug cost than 75% of clinicians listed under Nurse Practitioner in Frederick, MD (2024, 18 clinicians with data). Median for this group: $31,036. Middle half: $12,754 to $102,101.

A higher Part D drug cost than 70% of clinicians listed under Nurse Practitioner in Maryland (2024, 506 clinicians with data). Median for this group: $27,195. Middle half: $2,059 to $147,767.

49 active clinicians are listed under Nurse Practitioner with a practice address in Frederick, MD (1,273 in Maryland).

Addresses are self-reported to NPPES and may be out of date.

Telehealth indicator in Frederick

6.1% of these 49 clinicians have the CMS telehealth indicator.

59.2% of these 49 clinicians are listed by CMS as accepting Medicare assignment.

Sources: CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS release of October 2, 2026, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.

Text: T-MedInfo Β· Report an error.

Pharma & Medical Device Financial Disclosures

Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments

Open Payments Β· Program Year 2024
Disclosure Year:

Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $15.50.

Manufacturer Payment Nature Product Type Amount ($)
Fresenius USA Marketing, Inc.
Food and Beverage
In-kind items and services
Velphoro General $15.50

Source: CMS Open Payments, program year 2024, released June 30, 2026.

Medicare Part D Prescribing Profile & Medications

Medicare Part D prescriptions filled, including refills, in 2024.

CMS Part D Β· Data Year 2024
Prescription Year:
Brand Name Generic Name Prescriptions Day Supply Total Cost Patients
Sevelamer Carbonate Sevelamer Carbonate 78 4,698 $30,021.29 30
Prosol Parenteral Amino Acid 20% No.1 50 350 $24,975.02 β€”
Calcium Acetate Calcium Acetate 30 1,610 $3,016.71 β€”
Midodrine Hcl Midodrine Hcl 20 1,542 $637.57 β€”
Hydralazine Hcl Hydralazine Hcl 16 1,260 $211.56 β€”
Lidocaine-Prilocaine Lidocaine/Prilocaine 15 420 $169.30 β€”
Velphoro Sucroferric Oxyhydroxide 15 630 $46,026.77 β€”
Carvedilol Carvedilol 13 570 $166.39 β€”

Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits

Specialties & License Numbers Reported to NPPES

Self-certified to NPPES: 2026-07-14
Nurse Practitioner Primary Specialty

NUCC Taxonomy Code: 363L00000X

License # reported to NPPES MD R213903

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Check License Status with the State Board License numbers are self-reported to NPPES; T-MedInfo does not confirm them against state records. Current status: Maryland Board of Physicians.
Look Up on State Board Site

Medicare (PECOS) Enrollment & Ordering Eligibility

Source: CMS PECOS
Medicare FFS Enrollment Status Medicare Enrollment on File
CMS Provider Specialty

PRACTITIONER - NURSE PRACTITIONER

Medicare Enrollment ID

I20220228002112

Enrollment State Jurisdiction

MD

PECOS Control ID

5496149833

Medicare Order & Referring Eligibility
Clinical Lab & Imaging (Part B) Eligible
Durable Medical Equipment (DME) Eligible
Home Health Agency (HHA) Eligible
Power Mobility Devices (PMD) Eligible

Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.

Medicare Group Practice Enrollments

Source: CMS Doctors and Clinicians National Downloadable File, CMS release of October 2, 2026

Washington Nephrology Associates Llp

4141 A Duke St, Alexandria, VA 223042415

Phone: 7034613556

Frederick Health Medical Group Llc

1562 Opossumtown Pike, Frederick, MD 217024926

Phone: 2402156310

Clinicians Sharing This Practice Address or Phone

Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.

40 listed
Kristin Adelmeyer , CRNP

Nurse Practitioner - Family

NPI 1477063014

Certified Registered Nurse Practitioner

Brianna Adkinson , PA-C

Physician Assistant

NPI 1619453487

Physician Assistant (Certified)

Erica Aikens , PA-C

Physician Assistant

NPI 1538753082

Physician Assistant (Certified)

NPI 1659530509

Doctor of Medicine (M.D.)

Dr. Oscar Raymond Bascug , DO

Internal Medicine - Hematology & Oncology

NPI 1417484627

Doctor of Osteopathic Medicine (D.O.)

Abby Belay

Nurse Practitioner - Family

NPI 1164103701

Career & Practice History Timeline

Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status

10 Historical Events
πŸ“
Updated Practice Location July 14, 2026

Registered at 1562 OPOSSUMTOWN PIKE, FREDERICK, MD 217024337 (Tel: 2402156310)

πŸ“
Updated Business Mailing Address July 14, 2026

Registered at 1 FREDERICK HEALTH WAY, FREDERICK, MD 217019435

πŸ“
Updated Practice Location June 28, 2022

Registered at 116 DEFENSE HWY STE 202, ANNAPOLIS, MD 214017045 (Tel: 4102240270)

πŸ“
Updated Business Mailing Address June 28, 2022

Registered at 1201 SEVEN LOCKS RD STE 200A, ROCKVILLE, MD 208542931 (Tel: 3019073939)

βœ…
NPI Profile Active February 09, 2022

NPI status registered as active in NPPES database

πŸ“
Practice Location (Initial Record) February 09, 2022

Registered at 7115 GUILFORD DR STE 204, FREDERICK, MD 217045236 (Tel: 3016639570)

πŸ“
Business Mailing Address (Initial Record) February 09, 2022

Registered at 7115 GUILFORD DR STE 204, FREDERICK, MD 217045236 (Tel: 3016639570)

πŸ‘€
Provider Name / Credentials (Initial Record) February 09, 2022

Recorded as APRIL JOHN MERCADO, NP

πŸŽ“
Medical Taxonomy / Specialty Registered (Primary Specialty) February 09, 2022

Nurse Practitioner (license number reported to NPPES: MD R213903)

🟒
Initial NPI Registration & Enumeration February 09, 2022

First registered as active Individual Practitioner in NPPES Database.

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NPI Administrative Meta

NPI Number: 1497409452
Entity Type:
Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)
Enumeration Date: February 09, 2022
Last Update: July 14, 2026
Sole Proprietor: No

Other Nurse Practitioners in Frederick

All Nurse Practitioners in Frederick

Mailing Address

1 Frederick Health Way

Frederick, MD 217019435

About This Data NPPES fields (address, phone, specialty, license) are self-reported and may be outdated; Medicare fields follow the CMS dataset named in each section. Correct directly at NPPES.