Milliette Alvarado-Santiago, M.D.
Endocrinology, Diabetes & Metabolism Physician · Rio Piedras, PR
Milliette Alvarado-Santiago, M.D. is an endocrinology, diabetes & metabolism physician with a practice address in Rio Piedras, Puerto Rico, and NPI 1821306127, issued on Sep 21, 2010. Check the license (Puerto Rico 20554, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Milliette Alvarado-Santiago
- Credential
- M.D.
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 20554 PR
Self-reported in NPPES; status is on the state search - Practice location
- Clinica DE LA Escuela DE Medicina, Rio Piedras, PR 00921
- Phone
- (787) 758-7908
- Enumerated
- Sep 21, 2010
- Record last updated
- Aug 6, 2015 (not updated in 11 years: call before relying on the address or phone)
- Fax
- (787) 625-1966
- Medicare enrollment
- Enrolled (PECOS I20161114001484); accepts Medicare assignment
- Medical or professional school
- University Of Puerto Rico School Of Medicine, 2010
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 144 in Puerto Rico → Look up another NPI →
Also registered at Clinica DE LA Escuela DE Medicina
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Milliette Alvarado-Santiago 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 20554Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
2,921 Medicare Part D claims for 248 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 68% of claims.
Most prescribed
- Synthroid687 claims
- Ozempic183 claims
- Lantus137 claims
- Trulicity132 claims
- Rosuvastatin Calcium120 claims
- Humalog104 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: $37,851.79
102 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, 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.
Bills Medicare through 2 group practices
- Pro Health Clinical Services LLCBayamon, PR
- Recinto DE Ciencias MedicasCarolina, PR
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Milliette Alvarado-Santiago among 144 endocrinology, diabetes & metabolism physician records in Puerto Rico
Milliette Alvarado-Santiago, 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 2010, is newer than 53% of them.
- NPI issued2010 · 53% of these records are older, 45% newer
- In a Medicare fileYes · 97% of these records are
- In the CMS Doctors and Clinicians fileYes · 83% of these records are
- Graduated2010 · median 2007 among the 119 with a school on file
- Record last updated2015 · 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 Rio Piedras → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Isabel Arroyo Gomez, MDSan Juan, PR 009211770136871
- Jadailine Bermudez SantosSan Juan, PR 009211336648260
- Martha Gomez, MDSan Juan, PR 009211003822651
- Javier Gonzalez Cosme, MDSan Juan, PR 009211114449022
- Rafael Gonzalez-Rosario, M.D.Rio Piedras, PR 009211144427758
- Luis Hernandez Vazquez, M.D.San Juan, PR 009211407126675
- Zulmarie Maisonet Feliciano, MDSan Juan, PR 009211275157208
- Valerie Maldonado Torres, MDSan Juan, PR 009211649829664
Common questions
What is Milliette Alvarado-Santiago, M.D.'s NPI number?
Milliette Alvarado-Santiago, M.D.'s National Provider Identifier (NPI) is 1821306127, issued on Sep 21, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Milliette Alvarado-Santiago, M.D. located?
The NPPES record lists a practice address at Clinica DE LA Escuela DE Medicina, Rio Piedras, PR, 00921. Phone: (787) 758-7908. Providers update this record themselves, so call before visiting.
How can I verify Milliette Alvarado-Santiago, M.D.'s license?
NPPES lists Puerto Rico license number 20554, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Milliette Alvarado-Santiago, M.D. prescribe under Medicare Part D?
In 2024, Milliette Alvarado-Santiago, M.D. had 2,921 Medicare Part D claims for 248 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.