Ali Mastali, M.D.
General Practice Physician · San Juan, PR
Ali Mastali, M.D. is a general practice physician with a practice address in San Juan, Puerto Rico, and NPI 1821401258, issued on Jun 3, 2014. Check the license (Puerto Rico 18753, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Ali Mastali
- Credential
- M.D.
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 18753 PR
Self-reported in NPPES; status is on the state search - Practice location
- 313 C Columbia, San Juan, PR 00983
- Phone
- (424) 757-3037
- Enumerated
- Jun 3, 2014
- Record last updated
- Jun 3, 2014 (not updated in 12 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20141119001894); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 4,170 in Puerto Rico → Look up another NPI →
Verify Ali Mastali 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 18753Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average general practice physician in 2024
99 Medicare Part D claims for 63 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D.
Most prescribed
- Azithromycin15 claims
- Nitrofurantoin Mono-Macro15 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 69.7 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Kayenta Alternative Rural HospitalKayenta, AZ · Acute Care Hospitals
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov).
Ali Mastali among 4,170 general practice physician records in Puerto Rico
Ali Mastali, M.D. is one of 4,170 general practice physician records with a practice address in Puerto Rico. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 60% of them.
- NPI issued2014 · 60% of these records are older, 38% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 29% of these records are
- Graduated2011 · median 2004 among the 1,228 with a school on file
- Record last updated2014 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
622 general practice physician records list a practice address in San Juan
They are 622 of the 8,960 NPPES records with a practice address in San Juan, and 4,170 general practice physician records in Puerto Rico.
All 4,170 in Puerto Rico → Every provider in San Juan → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Rosita Arzuaga, MDCarolina, PR 009831538143979
- Jossepp Berry-Polanco, MDCarolina, PR 009831831185271
- Isaac Gonzalez, M.D.Toa Baja, PR 009831134280399
- Khadijah HamdallahCarolina, PR 009831831132513
- Luis Landestoy, MDCarolina, PR 009831346212388
- Eugenia Martinez-Mendez, MDCarolina, PR 009831881650653
- Carlos Mellado, MDCarolina, PR 009831104847268
- Ada Paisan Galban, MDCarolina, PR 009831588627137
Common questions
What is Ali Mastali, M.D.'s NPI number?
Ali Mastali, M.D.'s National Provider Identifier (NPI) is 1821401258, issued on Jun 3, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Ali Mastali, M.D. located?
The NPPES record lists a practice address at 313 C Columbia, San Juan, PR, 00983. Phone: (424) 757-3037. Providers update this record themselves, so call before visiting.
How can I verify Ali Mastali, M.D.'s license?
NPPES lists Puerto Rico license number 18753, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Ali Mastali, M.D. prescribe under Medicare Part D?
In 2024, Ali Mastali, M.D. had 99 Medicare Part D claims for 63 beneficiaries; the average among general practice physician prescribers was 3,030. Part D covers Medicare prescriptions only.
What is Ali Mastali, M.D.'s MIPS final score?
The 2023 MIPS final score is 69.7 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.