NPI registry status
Active
2026 NPPES data General Practice Physician NPI 1821401258 M.D.
Verify on CMS → Ali Mastali, M.D.
General Practice Physician in San Juan, Puerto Rico.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 16,838 in General Practice Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
99
Medicare Part D claims · 63 beneficiaries · General Practice Physician avg: 3K
MIPS score
69.7/100
▼ 14 pts below national avg 83.5 · Mid-tier
What the federal data shows
Ali Mastali, M.D. reported a CMS MIPS final score of 69.7/100 - below the 83.5 national average - and filed 99 Medicare Part D claims in 2024.
- 69.7/100
- MIPS score · -14 vs avg
- 99
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥8th
- pct among measured MIPS (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Ali Mastali, M.D.
Federal records show an active NPI with both Medicare prescribing volume and a measured CMS quality score — objective registry data, not patient reviews.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1821401258), first enumerated 06/03/2014.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 99 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
Reported a CMS MIPS final score of 69.7/100 in the Quality Payment Program — a federal quality measure, not a patient review.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
Compare Mastali with other General Practice Physician providers
Same primary specialty, same federal CMS NPPES roster.
All 579 General Practice Physician providers in San Juan, PR →
Also enrolled in Puerto Rico
- Dr. Veronica Abraham, MD Bayamon, PR
- Dr. Manuel Abraham Gonzalez, M.D. San Juan, PR
- Dr. Jennifer Abraham Vega, MD San Juan, PR
- Dr. Jose M. Abreu Guzman, M.D. Manati, PR
- Dr. Steven Abreu Reyes, M.D. Las Piedras, PR
- Ibrahim Abu-Usbaabdel-Fattah Aibonito, PR
Other specialties in San Juan: Student in an Organized Health Care Education/Training Program (1,265) · Pharmacist (515) · Clinical Psychologist (459) · Internal Medicine Physician (403)
CMS NPPES provider registry desk
NPI 1821401258 · General Practice Physician
NPI-10 · ENUM-MID · TAX-MID · MIPS-LOW · RX-TRACE · BOOK-LIGHT · PHOTO-FINISH
- NPI-10 1821401258
- ENUM-MID 2014
- TAX-MID 17K General Practice
- MIPS-LOW 69.7/100
- RX-TRACE 99
- BOOK-LIGHT 3,970 in Puerto Rico
- PHOTO-FINISH Iliana Ramirez-Salda… · ±0.1
MIPS final-score neighbourhood
Same-specialty nationwide peers by CMS final score, not geographic proximity
- Mastali · this p…
Mastali · this provider
69.7 MIPS pts
- Iliana Ramirez-S…
Iliana Ramirez-Saldana, M.D.
69.8 MIPS pts
- Jordan Simpson, …
Jordan Simpson, DO
69.9 MIPS pts
- Phillips Nagsuk,…
Phillips Nagsuk, M.D.
69.9 MIPS pts
- Curt Grob, M.D. …
Curt Grob, M.D. M.P.H
70.1 MIPS pts
What this shows Nearest measured MIPS peers for this NUCC specialty (2023 performance year).
Ali Mastali, M.D.'s MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
70 ≥ 8th percentile 8% of 454,083 measured providers are in lower value bands
Each bar is a band; taller bars hold more measured providers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative whole-score-point band: it counts only measured clinicians in lower score bands. A CMS MIPS metric is not a recommendation or a clinical-quality rating by PlainDoctor. See methodology § corpus placement.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Ali Mastali, M.D. sits
This provider among general practice physician peers
Across the 714 general practice physician providers who report both Medicare Part D prescribing and a MIPS quality score, Ali Mastali, M.D. writes more Part D claims than 21% of them and scores higher on MIPS quality than 19% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Each dot is one general practice physician peer from a representative sample of 60; the gold marker is Ali Mastali, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Ali Mastali, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Ali Mastali, M.D.?
Below national averagePrimary specialty
General Practice Physician
Medicare Part D claims
99 97% vs specialty avg
MIPS final score
69.7/100 13.8 pts vs avg
Specialty distribution in Puerto Rico
How General Practice Physician compares to other specialties among Puerto Rico providers
Medicare quality performance, MIPS
Ali Mastali, M.D.'s 2023 MIPS final score plotted against the General Practice Physician national average
- MIPS Final Score
- 69.7/100
- vs 83.5 national avg · 2023 performance year
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1821401258 |
|---|---|
| Specialty | General Practice Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/03/2014 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
69.6758
Final Score
Measured-score avg: 83.5
72.7931
Quality
18.541
Cost
74
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Ali Mastali, M.D. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Kayenta Alternative Rural Hospital
Kayenta, AZ
Acute Care Hospitals
CMS CCN: 030195
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
99
Total Claims
$1K
Total Drug Cost
63
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 99
- Total Day Supply
- 870
- Generic Drug Cost
- $828
- Antibiotic Claims
- 45
Patient Demographics
- Average Patient Age
- 70.7 years
- Avg HCC Risk Score
- 1.58
- Gender Split
- 67% female / 33% male
- Age Distribution
- <65: 14, 65-74: 25, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Azithromycin | 15 |
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
General Practice Physician Overview
How Ali Mastali, M.D. fits within the General Practice Physician landscape nationally.
16,838
General Practice Physician Providers in US
56
States with General Practice Physician
2,957
Avg Claims per Provider
Ali Mastali, M.D.'s 99 claims are below the specialty average of 2,957.
Nationwide General Practice Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Mastali, both outside Puerto Rico so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (69.7 here).
Same NPPES enumeration year (2014)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby General Practice Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Mastali.
One of 3,970 General Practice Physician providers enrolled in Puerto Rico, 11 are shown on this page.
Dr. Nidal Abukhalil Rashid
MD
Hatillo, PR
Dr. Adrian Acevedo
M.D.
Santa Isabel, PR
Dr. Angel Acevedo
MD
San Juan, PR
Angelic Acevedo
Vega Alta, PR
Dr. David Acevedo
M.D.
Caguas, PR
Compare General Practice Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Ali Mastali, M.D.'s specialty? ▼
Ali Mastali, M.D. specializes in General Practice Physician and practices in San Juan, Puerto Rico. Credentials: M.D..
How much does Ali Mastali, M.D. prescribe under Medicare Part D? ▼
In 2024, Ali Mastali, M.D. wrote 99 Medicare Part D claims totaling $1K in drug costs for 63 beneficiaries.
What is Ali Mastali, M.D.'s Medicare quality score? ▼
Ali Mastali, M.D. has a CMS MIPS Final Score of 69.7/100 (Quality: 72.8, Cost: 18.5). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Ali Mastali, M.D. located? ▼
Ali Mastali, M.D. is located at 313 C COLUMBIA, San Juan, PR, 00983. Phone: (424) 757-3037.
What is Ali Mastali, M.D.'s NPI number? ▼
Ali Mastali, M.D.'s National Provider Identifier (NPI) is 1821401258, issued on 06/03/2014.
How many General Practice Physician providers are there in the US? ▼
There are 16,838 General Practice Physician providers across 56 states in the US. The average General Practice Physician provider writes 2,957 Medicare Part D claims per year.
What drugs does Ali Mastali, M.D. prescribe most often? ▼
Based on 2024 Medicare Part D data, Ali Mastali, M.D.'s most frequently prescribed drugs include Azithromycin, Nitrofurantoin Mono-Macro. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Ali Mastali, M.D. accept Medicare? ▼
Ali Mastali, M.D. appears in CMS Medicare data with 99 Part D claims and 63 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Ali Mastali, M.D.'s credentials? ▼
Ali Mastali, M.D.'s NPI is 1821401258 with credentials M.D.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.