2026 NPPES data Geriatric Medicine (Internal Medicine) Physician NPI 1750328969 MD
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MARESSA ALEJANDRO REYES, MD

Geriatric Medicine (Internal Medicine) Physician in TUCSON, Arizona. CMS National Plan and Provider Enumeration System profile including specialty classification, practice address, and Medicare prescribing data when reported.

Federal data — no proprietary rating. PlainDoctor publishes the actual CMS NPPES and Medicare records — NPI registration, specialty, practice location, and prescribing data — without a composite score or editorial opinion on top. Every field traces to a federal source.
Prescribing volume
3K
Medicare Part D claims · 260 beneficiaries · Geriatric Medicine (Internal Medicine) Physician avg: 4K
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$296.52
10 payments · CMS Open Payments (Sunshine Act)
What the federal data reveals: MARESSA ALEJANDRO REYES, MD is a Geriatric Medicine (Internal Medicine) Physician ([object Object]) practicing in TUCSON, Arizona with a Medicare Part D prescribing footprint of 3K claims across 260 beneficiaries — 12% brand-name prescribing . Industry payments of $296.52 across 10 transactions are disclosed under CMS Open Payments (Sunshine Act).

What stands out: MARESSA ALEJANDRO REYES, MD filed 2,861 Medicare Part D claims in 2023 across TUCSON, Arizona. Every figure on this page comes straight from federal CMS records, with no proprietary rating applied.

Board certification likely (heuristic — not verified)

MARESSA ALEJANDRO REYES, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 2 hospital affiliations — signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).

MARESSA ALEJANDRO REYES, MD at a glance

Quality data not reported

NPI registry status

Active

Issued 05/31/2006

NPI 1750328969

Primary specialty

Geriatric Medicine (Internal Medicine) Physician

Niche

4,161 US NPIs in this specialty

Medicare Part D claims

2,861 36% vs specialty avg

2023 prescription claims

Specialty avg: 4,450

Specialty distribution in Arizona

How Geriatric Medicine (Internal Medicine) Physician compares to other specialties among Arizona providers

Arizona providers

Geriatric Medicine (Internal Medicine) Physician share within Arizona

1. Geriatric Medicine (Internal Medicine) Physician42%2. Internal medicine21%3. Family medicine17%4. Surgical12%5. Pediatric8%
Geriatric Medicine (Internal Medicine) Physician share within Arizona

Specialty board-certification context

Estimated specialty board-certified rate — Geriatric Medicine (Internal Medicine) Physician (ABMS / AOA reference)

Quality data not reported
Est. board-certified rate
78%
Geriatric Medicine (Internal Medicine) Physician ABMS/AOA estimate

Est. board-certified rate (Geriatric Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

0%100%78%
Est. board-certified rate (Geriatric Medicine (Internal Medicine) Physician) — ABMS / AOA estimate

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).

MARESSA ALEJANDRO REYES, MD is a Geriatric Medicine (Internal Medicine) Physician provider practicing in TUCSON, Arizona, according to the CMS National Plan and Provider Enumeration System (NPPES). Credentials: MD. NPI: 1750328969. This profile includes practice location, specialty classification, and organizational affiliations from the CMS provider registry. Provider information is self-reported to CMS and updated monthly.

MARESSA ALEJANDRO REYES, MD appears in the CMS NPPES registry as a Geriatric Medicine (Internal Medicine) Physician provider holding MD credentials at 1702 W. ANKLAM ROAD, TUCSON, AZ, 85745, with a listed phone of (520) 749-3031. NPI 1750328969 was issued on 05/31/2006. Because NPPES data is self-reported by the provider and refreshed monthly, the address, phone, and specialty reflect what ALEJANDRO REYES most recently submitted to CMS rather than a vetted directory listing, which is why patients should always confirm the practice is still at this location before scheduling.

Medicare Part D records for calendar year 2023 show 2,861 prescription claims written by this provider, covering 260 Medicare beneficiaries and totaling roughly $402K in drug spend, split 12% brand-name and 88% generic by claim count, with an opioid prescribing rate of 0.6%. These figures capture only Medicare Part D — commercial insurance, Medicaid, and cash-pay prescriptions are not included, and any drug-beneficiary cell under 11 is suppressed by CMS for patient privacy.

Geriatric Medicine (Internal Medicine) Physician is a narrow specialty nationwide, with 4,161 enrolled providers across 52 states and an average of 4,450 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

1702 W. ANKLAM ROAD
TUCSON, AZ 85745

Provider Details

NPI 1750328969
Specialty Geriatric Medicine (Internal Medicine) Physician
Credentials MD
Gender Female
NPI Issued 05/31/2006

Hospital and facility affiliations

Facilities where MARESSA ALEJANDRO REYES, MD 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.

FUSION MEDICAL CARE PLLC
SCOTTSDALE, AZ
I AM WELLNESS AZ LLC
PHOENIX, AZ

Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).

Industry payments received (2024) — CMS Open Payments transparency data

The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for MARESSA ALEJANDRO REYES, MD. Source: openpaymentsdata.cms.gov.

Total received

$297

Largest payer

Boston Scientific Corporation

Most common payment type

Food and Beverage

Industry payments are not necessarily indicators of bias — they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.

Brand vs generic prescribing mix · Typical

MARESSA ALEJANDRO REYES, MD — brand share 12.0%
Specialty average (est.)

12% brand-name claims vs 88% generic, on 2,861 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.

2,861
Total Claims
$402K
Total Drug Cost
260
Medicare Beneficiaries

Prescribing Breakdown

30-Day Fills
7,621
Total Day Supply
224,682
Brand vs Generic
12% brand / 88% generic
Brand Drug Cost
$343K
Generic Drug Cost
$57K
Opioid Claims
18 (0.6% rate)
Antibiotic Claims
72

Patient Demographics

Average Patient Age
70.7 years
Avg HCC Risk Score
1.66
Gender Split
57% female / 43% male
Age Distribution
<65: 38, 65-74: 144, 75-84: 61, 85+: 17

Top Prescribed Drugs (Medicare Part D)

Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.

Drug Claims
Atorvastatin Calcium
253
Lisinopril
170
Amlodipine Besylate
156
Metformin Hcl
134
Levothyroxine Sodium
112
Pantoprazole Sodium
101
Escitalopram Oxalate
91
Ibandronate Sodium
76
Losartan Potassium
72
Gabapentin
63

* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.

Geriatric Medicine (Internal Medicine) Physician Overview

How MARESSA ALEJANDRO REYES, MD fits within the Geriatric Medicine (Internal Medicine) Physician landscape nationally.

4,161
Geriatric Medicine (Internal Medicine) Physician Providers in US
52
States with Geriatric Medicine (Internal Medicine) Physician
4,450
Avg Claims per Provider

MARESSA ALEJANDRO REYES, MD's 2,861 claims are below the specialty average of 4,450.

Nearby Geriatric Medicine (Internal Medicine) Physician Providers in Arizona

Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as ALEJANDRO REYES.

Compare Geriatric Medicine (Internal Medicine) Physician nationally: see state-by-state distribution →

Frequently Asked Questions

What is MARESSA ALEJANDRO REYES, MD's specialty?
MARESSA ALEJANDRO REYES, MD specializes in Geriatric Medicine (Internal Medicine) Physician and practices in TUCSON, Arizona. Credentials: MD.
How much does MARESSA ALEJANDRO REYES, MD prescribe under Medicare Part D?
In 2023, MARESSA ALEJANDRO REYES, MD wrote 2,861 Medicare Part D claims totaling $402K in drug costs for 260 beneficiaries.
Where is MARESSA ALEJANDRO REYES, MD located?
MARESSA ALEJANDRO REYES, MD is located at 1702 W. ANKLAM ROAD, TUCSON, AZ, 85745. Phone: (520) 749-3031.
What is MARESSA ALEJANDRO REYES, MD's NPI number?
MARESSA ALEJANDRO REYES, MD's National Provider Identifier (NPI) is 1750328969, issued on 05/31/2006.
Does MARESSA ALEJANDRO REYES, MD prescribe more brand-name or generic drugs?
MARESSA ALEJANDRO REYES, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $343K in brand drug costs.
Does MARESSA ALEJANDRO REYES, MD prescribe opioids?
Yes, MARESSA ALEJANDRO REYES, MD had 18 opioid claims in 2023 with an opioid prescribing rate of 0.6%.
How many Geriatric Medicine (Internal Medicine) Physician providers are there in the US?
There are 4,161 Geriatric Medicine (Internal Medicine) Physician providers across 52 states in the US. The average Geriatric Medicine (Internal Medicine) Physician provider writes 4,450 Medicare Part D claims per year.
What drugs does MARESSA ALEJANDRO REYES, MD prescribe most often?
Based on 2023 Medicare Part D data, MARESSA ALEJANDRO REYES, MD's most frequently prescribed drugs include Atorvastatin Calcium, Lisinopril, Amlodipine Besylate. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does MARESSA ALEJANDRO REYES, MD accept Medicare?
MARESSA ALEJANDRO REYES, MD appears in CMS Medicare data with 2,861 Part D claims and 260 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify MARESSA ALEJANDRO REYES, MD's credentials?
MARESSA ALEJANDRO REYES, MD's NPI is 1750328969 with credentials MD. 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

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