NPI registry status
Active
2026 NPPES data Infectious Disease Physician NPI 1366869323 M.D.
Verify on CMS → Mariela Hernandez Cajigas, M.D.
Infectious Disease Physician in Lares, 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 8,292 in Infectious Disease 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
3K
Medicare Part D claims · 301 beneficiaries · Infectious Disease Physician avg: 816
Generic prescribing
78%
generic claims · 21% brand-name · higher generic rates reduce patient out-of-pocket costs
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Mariela Hernandez Cajigas, M.D. filed 2,804 Medicare Part D claims in 2023 as a Infectious Disease Physician in Lares, Puerto Rico, prescribing 78% generic.
- 3K
- Part D claims, 2023
- 78%
- generic prescribing
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.
Mariela Hernandez Cajigas, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
2,804 Top 12% higher than 88% of 1,370,886 prescribers
Each bar is a band; taller bars hold more prescribers. 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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Mariela Hernandez Cajigas, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Mariela Hernandez Cajigas, M.D.?
Quality data not reportedPrimary specialty
Infectious Disease Physician
Medicare Part D claims
2,804 244% vs specialty avg
Specialty distribution in Puerto Rico
How Infectious Disease Physician compares to other specialties among Puerto Rico providers
Board certification
Not published by CMS
CMS does not publish a per-provider board-certification field in NPPES. PlainDoctor does not have a reliable per-specialty certification rate to show for Infectious Disease Physician. Verify directly:
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).
Mariela Hernandez Cajigas, M.D. appears in the CMS NPPES registry as a Infectious Disease Physician provider holding M.D. credentials at CARRETERA 129 KM 29.3, Lares, PR, 00669, with a listed phone of (787) 323-7358. NPI 1366869323 was issued on 03/27/2014.
Medicare Part D records for calendar year 2023 show 2,804 prescription claims written by this provider, covering 301 Medicare beneficiaries and totaling roughly $266K in drug spend, split 21% brand-name and 78% generic by claim count, with an opioid prescribing rate of 0.7%.
Infectious Disease Physician is a mid-sized specialty nationwide, with 8,292 enrolled providers across 54 states and an average of 816 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1366869323 |
|---|---|
| Specialty | Infectious Disease Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 03/27/2014 |
Brand vs generic prescribing mix · Typical
Mariela Hernandez Cajigas, M.D. - brand share 21.0%
Infectious Disease Physician average
21% brand-name claims vs 78% generic, on 2,804 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
2,804
Total Claims
$266K
Total Drug Cost
301
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 4,734
- Total Day Supply
- 135,163
- Brand vs Generic
- 21% brand / 78% generic
- Brand Drug Cost
- $214K
- Generic Drug Cost
- $50K
- Opioid Claims
- 19 (0.7% rate)
- Antibiotic Claims
- 67
Patient Demographics
- Average Patient Age
- 70.0 years
- Avg HCC Risk Score
- 2.58
- Gender Split
- 61% female / 39% male
- Age Distribution
- <65: 75, 65-74: 128, 75-84: 75, 85+: 23
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Mariela Hernandez Cajigas, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Famotidine
Famotidine
166 claims
- Synthroid
Synthroid
155 claims
- Gabapentin
Gabapentin
140 claims
- Losartan Potassium
Losartan Potassium
125 claims
- Atorvastatin Calcium
Atorvastatin Calcium
78 claims
- Fluticasone Propio… 62
Fluticasone Propionate
62 claims
- Montelukast Sodium 62
Montelukast Sodium
62 claims
- Amlodipine Besylate 60
Amlodipine Besylate
60 claims
| Drug | Claims |
|---|---|
| Famotidine | 166 |
| Synthroid Levothyroxine Sodium | 155 |
| Gabapentin | 140 |
| Losartan Potassium | 125 |
| Atorvastatin Calcium | 78 |
| Fluticasone Propionate | 62 |
| Montelukast Sodium | 62 |
| Amlodipine Besylate | 60 |
| Pantoprazole Sodium | 60 |
| Metoprolol Succinate | 58 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Infectious Disease Physician Overview
How Mariela Hernandez Cajigas, M.D. fits within the Infectious Disease Physician landscape nationally.
8,292
Infectious Disease Physician Providers in US
54
States with Infectious Disease Physician
816
Avg Claims per Provider
Mariela Hernandez Cajigas, M.D.'s 2,804 claims are above the specialty average of 816.
Nearby Infectious Disease Physician Providers in Puerto Rico
Other clinicians with the same primary specialty enrolled in Puerto Rico, drawn from the same CMS NPPES roster as Hernandez Cajigas.
Dr. Dionisio Acosta Martinez
MD
Guaynabo, PR
Dr. Francisco Alvarado Melendez
M.D.
Caguas, PR
Dr. Luis Alvarez Lugo
MD
Humacao, PR
Dr. Rosana Amador-Miranda
M.D.
Ponce, PR
Dr. Elba Arroyo Camunas
M.D.
San Juan, PR
Compare Infectious Disease Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the Puerto Rico medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Infectious Disease Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
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Frequently Asked Questions
What is Mariela Hernandez Cajigas, M.D.'s specialty? ▼
Mariela Hernandez Cajigas, M.D. specializes in Infectious Disease Physician and practices in Lares, Puerto Rico. Credentials: M.D..
How much does Mariela Hernandez Cajigas, M.D. prescribe under Medicare Part D? ▼
In 2023, Mariela Hernandez Cajigas, M.D. wrote 2,804 Medicare Part D claims totaling $266K in drug costs for 301 beneficiaries.
Where is Mariela Hernandez Cajigas, M.D. located? ▼
Mariela Hernandez Cajigas, M.D. is located at CARRETERA 129 KM 29.3, Lares, PR, 00669. Phone: (787) 323-7358.
What is Mariela Hernandez Cajigas, M.D.'s NPI number? ▼
Mariela Hernandez Cajigas, M.D.'s National Provider Identifier (NPI) is 1366869323, issued on 03/27/2014.
Does Mariela Hernandez Cajigas, M.D. prescribe more brand-name or generic drugs? ▼
Mariela Hernandez Cajigas, M.D.'s prescribing is 21% brand-name and 78% generic drugs by claim count, with $214K in brand drug costs.
Does Mariela Hernandez Cajigas, M.D. prescribe opioids? ▼
Yes, Mariela Hernandez Cajigas, M.D. had 19 opioid claims in 2023 with an opioid prescribing rate of 0.7%.
How many Infectious Disease Physician providers are there in the US? ▼
There are 8,292 Infectious Disease Physician providers across 54 states in the US. The average Infectious Disease Physician provider writes 816 Medicare Part D claims per year.
What drugs does Mariela Hernandez Cajigas, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Mariela Hernandez Cajigas, M.D.'s most frequently prescribed drugs include Famotidine, Synthroid, Gabapentin. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Mariela Hernandez Cajigas, M.D. accept Medicare? ▼
Mariela Hernandez Cajigas, M.D. appears in CMS Medicare data with 2,804 Part D claims and 301 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mariela Hernandez Cajigas, M.D.'s credentials? ▼
Mariela Hernandez Cajigas, M.D.'s NPI is 1366869323 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 (2023). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.