NPI registry status
Active
2026 NPPES data Obstetrics & Gynecology Physician NPI 1720048549 M.D.
Verify on CMS → Rex Mabey, M.D.
Obstetrics & Gynecology Physician in Las Vegas, Nevada.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 44,326 in Obstetrics & Gynecology 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
527
Medicare Part D claims · 121 beneficiaries · Obstetrics & Gynecology Physician avg: 179
Generic prescribing
84%
generic claims · 16% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$196.3
2 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Rex Mabey, M.D. filed 527 Medicare Part D claims in 2023 as an Obstetrics & Gynecology Physician in Las Vegas, Nevada, prescribing 84% generic.
- 527
- Part D claims, 2023
- 84%
- generic prescribing
- $196.3
- industry payments (Sunshine Act)
- ≥66th
- pct by Part D claim volume (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.
CMS NPPES provider registry desk
NPI 1720048549 · Obstetrics & Gynecology Physician
NPI-10 · ENUM-LEGACY · TAX-MID · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1720048549
- ENUM-LEGACY 2006
- TAX-MID 44K Obstetrics &
- RX-LIGHT 527
- BOOK-THIN 317 in Nevada
- PHOTO-ENUM Mark Mallinger · 2006
Rex Mabey, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
527 ≥ 66th percentile 66% of 1,370,886 prescribers are in lower value bands
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.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2023
◑
Board-eligible specialty (heuristic, not verified)
Rex Mabey, 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 Rex Mabey, M.D.?
Quality data not reportedPrimary specialty
Obstetrics & Gynecology Physician
Medicare Part D claims
527 194% vs specialty avg
Specialty distribution in Nevada
How Obstetrics & Gynecology Physician compares to other specialties among Nevada 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 Obstetrics & Gynecology 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).
Practice Address
Provider Details
| NPI | 1720048549 |
|---|---|
| Specialty | Obstetrics & Gynecology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/24/2006 |
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 Rex Mabey, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$196
Largest payer
Astellas Pharma US Inc
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
Rex Mabey, M.D. - brand share 16.0%
Obstetrics & Gynecology Physician average
16% brand-name claims vs 84% generic, on 527 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.
527
Total Claims
$25K
Total Drug Cost
121
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,096
- Total Day Supply
- 29,808
- Brand vs Generic
- 16% brand / 84% generic
- Brand Drug Cost
- $14K
- Generic Drug Cost
- $12K
- Antibiotic Claims
- 54
Patient Demographics
- Average Patient Age
- 71.5 years
- Avg HCC Risk Score
- 0.75
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Rex Mabey, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Estradiol
Estradiol
134 claims
- Fluconazole 47
Fluconazole
47 claims
- Ciprofloxacin Hcl 26
Ciprofloxacin Hcl
26 claims
- Medroxyprogesteron… 24
Medroxyprogesterone Acetate
24 claims
- Acyclovir 19
Acyclovir
19 claims
- Betamethasone Vale… 13
Betamethasone Valerate
13 claims
- Combipatch 13
Combipatch
13 claims
- Terconazole 12
Terconazole
12 claims
| Drug | Claims |
|---|---|
| Estradiol | 134 |
| Fluconazole | 47 |
| Ciprofloxacin Hcl | 26 |
| Medroxyprogesterone Acetate | 24 |
| Acyclovir | 19 |
| Betamethasone Valerate | 13 |
| Combipatch Estradiol/Norethindrone Acet | 13 |
| Terconazole | 12 |
| Mupirocin | 11 |
| Zolpidem Tartrate | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Obstetrics & Gynecology Physician Overview
How Rex Mabey, M.D. fits within the Obstetrics & Gynecology Physician landscape nationally.
44,326
Obstetrics & Gynecology Physician Providers in US
56
States with Obstetrics & Gynecology Physician
179
Avg Claims per Provider
Rex Mabey, M.D.'s 527 claims are above the specialty average of 179.
Nationwide Obstetrics & Gynecology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Mabey, both outside Nevada so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Obstetrics & Gynecology Physician Providers in Nevada
Other clinicians with the same primary specialty enrolled in Nevada, drawn from the same CMS NPPES roster as Mabey.
One of 317 Obstetrics & Gynecology Physician providers enrolled in Nevada, 5 are shown here.
Dr. Nader Abdelsayed
MEDICAL DOCTOR
North Las Vegas, NV
Dr. Stanley Abramow
MD
Las Vegas, NV
Dr. Rueben Adegoke
MD
Henderson, NV
Dr. Janelle Agosto-Marquez
MD
Las Vegas, NV
Dr. Samet Albayrak
MD
Las Vegas, NV
Compare Obstetrics & Gynecology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Rex Mabey, M.D.'s specialty? ▼
Rex Mabey, M.D. specializes in Obstetrics & Gynecology Physician and practices in Las Vegas, Nevada. Credentials: M.D..
How much does Rex Mabey, M.D. prescribe under Medicare Part D? ▼
In 2023, Rex Mabey, M.D. wrote 527 Medicare Part D claims totaling $25K in drug costs for 121 beneficiaries.
Where is Rex Mabey, M.D. located? ▼
Rex Mabey, M.D. is located at 2881 N TENAYA WAY, Las Vegas, NV, 89128. Phone: (702) 242-8800.
What is Rex Mabey, M.D.'s NPI number? ▼
Rex Mabey, M.D.'s National Provider Identifier (NPI) is 1720048549, issued on 03/24/2006.
Does Rex Mabey, M.D. prescribe more brand-name or generic drugs? ▼
Rex Mabey, M.D.'s prescribing is 16% brand-name and 84% generic drugs by claim count, with $14K in brand drug costs.
How many Obstetrics & Gynecology Physician providers are there in the US? ▼
There are 44,326 Obstetrics & Gynecology Physician providers across 56 states in the US. The average Obstetrics & Gynecology Physician provider writes 179 Medicare Part D claims per year.
What drugs does Rex Mabey, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Rex Mabey, M.D.'s most frequently prescribed drugs include Estradiol, Fluconazole, Ciprofloxacin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Rex Mabey, M.D. accept Medicare? ▼
Rex Mabey, M.D. appears in CMS Medicare data with 527 Part D claims and 121 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Rex Mabey, M.D.'s credentials? ▼
Rex Mabey, M.D.'s NPI is 1720048549 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
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 May 2026.