NPPES file of Aug 9, 2026

Rosa Alexandra Lozada Sierra, M.D.

Cornea and External Diseases Specialist Physician · San Juan, PR

Rosa Alexandra Lozada Sierra, M.D. is a cornea and external diseases specialist physician with a practice address in San Juan, Puerto Rico, and NPI 1154707206, issued on Jul 30, 2015. Check the license (Puerto Rico 19445, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1154707206
Name
Rosa Alexandra Lozada Sierra
Credential
M.D.
Primary taxonomy
Cornea and External Diseases Specialist Physician 207WX0120X
License number
19445 PR
Self-reported in NPPES; status is on the state search
Practice location
239 Ave Arterial Hostos Ste 306, San Juan, PR 00918
Phone
(787) 250-1746
Enumerated
Jul 30, 2015
Record last updated
Nov 10, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20210608001583); may accept Medicare assignment
Medical or professional school
University Of Puerto Rico School Of Medicine, 2020
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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3 nearest cornea and external diseases specialist physician records → All 4 in Puerto Rico → Look up another NPI →

Verify Rosa Alexandra Lozada Sierra in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Puerto Rico board licenses this profession
    Search for license 19445    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
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2.2 times the Medicare Part D claims of the average cornea and external diseases specialist physician in 2024

2,748 Medicare Part D claims for 631 beneficiaries, against an average of 1,263 among the 330 providers of this specialty who prescribed in Part D. Brand-name drugs were 60% of claims.

  1. Rosa Lozada Sierra2,748
  2. Specialty average1,263

Most prescribed

  1. Prednisolone Acetate704 claims
  2. Ofloxacin350 claims
  3. Ketorolac Tromethamine341 claims
  4. Latanoprost312 claims
  5. Fluorometholone192 claims
  6. Ciprofloxacin Hcl136 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: $19.62

1 payment: food and beverage; the largest payer was Alcon Puerto Rico Inc. The 284 providers of this specialty with any payment received $3,109.37 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Rosa Lozada Sierra$19.62
  2. Specialty average$3,109.37

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Cornea and External Diseases Specialist Physician providers in Puerto Rico

There are 4 cornea and external diseases specialist physician records in Puerto Rico.

All 4 in Puerto Rico → Every provider in San Juan → Cornea and External Diseases Specialist Physician nationwide →

The 3 cornea and external diseases specialist physician records with the nearest ZIP codes

  1. Jose QuinteroSan Juan, PR 009231356717441
  2. Jose De La Cruz-Napoli, M.D.San Juan, PR 009011033182548
  3. Frances Marrero Barrera, MDCaguas, PR 007251275049488

Common questions

What is Rosa Alexandra Lozada Sierra, M.D.'s NPI number?

Rosa Alexandra Lozada Sierra, M.D.'s National Provider Identifier (NPI) is 1154707206, issued on Jul 30, 2015. An NPI identifies a provider in billing; it is not a license.

Where is Rosa Alexandra Lozada Sierra, M.D. located?

The NPPES record lists a practice address at 239 Ave Arterial Hostos Ste 306, San Juan, PR, 00918. Phone: (787) 250-1746. Providers update this record themselves, so call before visiting.

How can I verify Rosa Alexandra Lozada Sierra, M.D.'s license?

NPPES lists Puerto Rico license number 19445, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.

How much does Rosa Alexandra Lozada Sierra, M.D. prescribe under Medicare Part D?

In 2024, Rosa Alexandra Lozada Sierra, M.D. had 2,748 Medicare Part D claims for 631 beneficiaries; the average among cornea and external diseases specialist physician prescribers was 1,263. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.