Marielly Sierra Mercado, M.D.
Endocrinology, Diabetes & Metabolism Physician · San Juan, PR
Marielly Sierra Mercado, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in San Juan, Puerto Rico, and NPI 1013258482, issued on Mar 11, 2013. Check the license (Puerto Rico 19192, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marielly Sierra Mercado
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 19192 PR
Self-reported in NPPES; status is on the state search - Practice location
- University District Hospital, San Juan, PR 00935
- Phone
- (787) 754-0101
- Enumerated
- Mar 11, 2013
- Record last updated
- Jul 26, 2018 (not updated in 8 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190214002620); may accept Medicare assignment
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 144 in Puerto Rico → Look up another NPI →
Also registered at University District Hospital
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marielly Sierra Mercado in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Puerto Rico board licenses this profession
Search for license 19192Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average endocrinology, diabetes & metabolism physician in 2024
6,925 Medicare Part D claims for 423 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 54% of claims.
Most prescribed
- Synthroid1,321 claims
- Atorvastatin Calcium491 claims
- Rosuvastatin Calcium296 claims
- Omega-3 Acid Ethyl Esters285 claims
- Jardiance245 claims
- Metformin Hcl226 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: $935.84
11 payments; by number, the most common kind was food and beverage; the largest payer was Sanofi-Aventis U.S. LLC. The 5,661 providers of this specialty with any payment received $5,742.15 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.
Marielly Sierra Mercado among 144 endocrinology, diabetes & metabolism physician records in Puerto Rico
Marielly Sierra Mercado, M.D. is one of 144 endocrinology, diabetes & metabolism physician records with a practice address in Puerto Rico. 97% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 63% of them.
- NPI issued2013 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 97% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2011 · median 2007 among the 119 with a school on file
- Record last updated2018 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Puerto Rico
There are 144 endocrinology, diabetes & metabolism physician records in Puerto Rico.
All 144 in Puerto Rico → Every provider in San Juan → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Lillian Haddock-Suarez, M.D.Rio Piedras, PR 009351841275104
- Margarita Ramirez-Vick, MDSan Juan, PR 009351992858047
- Noel Torres, MDSan Juan, PR 009351003494964
- Carlos Figueroa Nunez, MDSan Juan, PR 009361609868231
- Viviana Sanchez Arniella, MDSan Juan, PR 009361679737456
- Monica Santiago Nunez, MDSan Juan, PR 009361942293642
- Ernesto Sola Sanchez, M.D.San Juan, PR 009361447511480
- Ivan Rivera Nazario, MDSan Juan, PR 009281124554449
Common questions
What is Marielly Sierra Mercado, M.D.'s NPI number?
Marielly Sierra Mercado, M.D.'s National Provider Identifier (NPI) is 1013258482, issued on Mar 11, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Marielly Sierra Mercado, M.D. located?
The NPPES record lists a practice address at University District Hospital, San Juan, PR, 00935. Phone: (787) 754-0101. Providers update this record themselves, so call before visiting.
How can I verify Marielly Sierra Mercado, M.D.'s license?
NPPES lists Puerto Rico license number 19192, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Marielly Sierra Mercado, M.D. prescribe under Medicare Part D?
In 2024, Marielly Sierra Mercado, M.D. had 6,925 Medicare Part D claims for 423 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.