April John Tambaoan Mercado, NP
Nurse Practitioner · Frederick, MD
April John Tambaoan Mercado, NP is a nurse practitioner with a practice address in Frederick, Maryland, and NPI 1497409452, issued on Feb 9, 2022. Check the license (Maryland R213903, as entered in NPPES) with the Maryland board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- April John Tambaoan Mercado
- Credential
- NP
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- R213903 MD
Self-reported in NPPES; status is on the state search - Practice location
- 1562 Opossumtown Pike, Frederick, MD 21702
- Phone
- (240) 215-6310
- Enumerated
- Feb 9, 2022
- Record last updated
- Jul 14, 2026
- Fax
- (240) 566-7754
- Medicare enrollment
- Enrolled (PECOS I20240122002310); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 1,248 in Maryland → Look up another NPI →
Also registered at 1562 Opossumtown Pike
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify April John Tambaoan Mercado in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license R213903Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average nurse practitioner in 2024
304 Medicare Part D claims for 68 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims.
Most prescribed
- Sevelamer Carbonate78 claims
- Prosol50 claims
- Calcium Acetate30 claims
- Midodrine Hcl20 claims
- Hydralazine Hcl16 claims
- Lidocaine-Prilocaine15 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $15.50
1 payment: food and beverage; the largest payer was Fresenius USA Marketing, Inc. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Washington Nephrology Associates LLPAlexandria, VA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
April John Tambaoan Mercado among 1,248 nurse practitioner records in Maryland
April John Tambaoan Mercado, NP is one of 1,248 nurse practitioner records with a practice address in Maryland. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2022, is newer than 76% of them.
- NPI issued2022 · 76% of these records are older, 19% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2021 · median 2018 among the 655 with a school on file
- Record last updated2026 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
46 nurse practitioner records list a practice address in Frederick
They are 46 of the 3,981 NPPES records with a practice address in Frederick, and 1,248 nurse practitioner records in Maryland.
All 1,248 in Maryland → Every provider in Frederick → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Elizabeth Arnone, CRNPFrederick, MD 217021316041494
- Stephanie Comer-Concordia, CRNPFrederick, MD 217021508847286
- Susan Cottrell, CRNPFrederick, MD 217021205346079
- Sally Farr, NPFrederick, MD 217021043223795
- Sarah JenningsFrederick, MD 217021518325497
- Randie McLaughlin, C.R.N.P.Frederick, MD 217021598756389
- Linda Muehl, CRNPFrederick, MD 217021326018664
- Chloe Nichols, NPFrederick, MD 217021053654541
Common questions
What is April John Tambaoan Mercado, NP's NPI number?
April John Tambaoan Mercado, NP's National Provider Identifier (NPI) is 1497409452, issued on Feb 9, 2022. An NPI identifies a provider in billing; it is not a license.
Where is April John Tambaoan Mercado, NP located?
The NPPES record lists a practice address at 1562 Opossumtown Pike, Frederick, MD, 21702. Phone: (240) 215-6310. Providers update this record themselves, so call before visiting.
How can I verify April John Tambaoan Mercado, NP's license?
NPPES lists Maryland license number R213903, as entered by the provider. Search the Maryland board that licenses this profession; the NPPES record confirms identity only.
How much does April John Tambaoan Mercado, NP prescribe under Medicare Part D?
In 2024, April John Tambaoan Mercado, NP had 304 Medicare Part D claims for 68 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.