NPI registry status
Active
2026 NPPES data Pediatric Urology Physician NPI 1740448703 M.D.
Verify on CMS → Gwen Grimsby, M.D.
Pediatric Urology Physician in Phoenix, Arizona.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 349 in Pediatric Urology 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
122
Medicare Part D claims · Pediatric Urology Physician avg: 654
Generic prescribing
63%
generic claims · 37% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$32.03
1 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Gwen Grimsby, M.D. filed 122 Medicare Part D claims in 2023 as a Pediatric Urology Physician in Phoenix, Arizona, prescribing 63% generic.
- 122
- Part D claims, 2023
- 63%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥35th
- 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 1740448703 · Pediatric Urology Physician
NPI-10 · ENUM-MID · TAX-TRACE · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1740448703
- ENUM-MID 2008
- TAX-TRACE 349
- RX-LIGHT 122
- BOOK-THIN 7 in Arizona
- PHOTO-ENUM Katie Willihnganz-La… · 2008
Gwen Grimsby, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
122 ≥ 35th percentile 35% 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 certification likely (heuristic, not verified)
Gwen Grimsby, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Gwen Grimsby, M.D.?
Quality data not reportedPrimary specialty
Pediatric Urology Physician
Medicare Part D claims
122 81% vs specialty avg
Specialty distribution in Arizona
How Pediatric Urology Physician compares to other specialties among Arizona 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 Pediatric Urology 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 | 1740448703 |
|---|---|
| Specialty | Pediatric Urology Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 05/27/2008 |
Hospital and facility affiliations
Facilities where Gwen Grimsby, 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.
Phoenix Children's Hospital
Phoenix, AZ
Childrens
CMS CCN: 033302
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 Gwen Grimsby, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$32
Largest payer
Teleflex LLC
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 · Above average
Gwen Grimsby, M.D. - brand share 37.0%
Pediatric Urology Physician average
37% brand-name claims vs 63% generic, on 122 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.
122
Total Claims
$35K
Total Drug Cost
N/A
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 130
- Total Day Supply
- 3,715
- Brand vs Generic
- 37% brand / 63% generic
- Brand Drug Cost
- $32K
- Generic Drug Cost
- $3K
- Antibiotic Claims
- 49
Patient Demographics
- Average Patient Age
- 18.4 years
- Avg HCC Risk Score
- 3.33
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gwen Grimsby, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Oxybutynin Chlorid…
Oxybutynin Chloride Er
41 claims
- Nitrofurantoin
Nitrofurantoin
31 claims
- Myrbetriq
Myrbetriq
28 claims
| Drug | Claims |
|---|---|
| Oxybutynin Chloride Er Oxybutynin Chloride | 41 |
| Nitrofurantoin Nitrofurantoin Macrocrystal | 31 |
| Myrbetriq Mirabegron | 28 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Pediatric Urology Physician Overview
How Gwen Grimsby, M.D. fits within the Pediatric Urology Physician landscape nationally.
349
Pediatric Urology Physician Providers in US
44
States with Pediatric Urology Physician
654
Avg Claims per Provider
Gwen Grimsby, M.D.'s 122 claims are below the specialty average of 654.
Nationwide Pediatric Urology Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Grimsby, both outside Arizona so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2008)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Pediatric Urology Physician Providers in Arizona
Other clinicians with the same primary specialty enrolled in Arizona, drawn from the same CMS NPPES roster as Grimsby.
One of 7 Pediatric Urology Physician providers enrolled in Arizona, 5 are shown here.
Dr. Richard Ashley
M.D.
Tucson, AZ
Dr. Ben Donovan
M.D.
Peoria, AZ
Dr. Ariella Friedman
MD
Glendale, AZ
Dr. Arthi Hannallah
MD
Tucson, AZ
Dr. Derrick Johnston
M.D.
Tucson, AZ
Compare Pediatric Urology Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Gwen Grimsby, M.D.'s specialty? ▼
Gwen Grimsby, M.D. specializes in Pediatric Urology Physician and practices in Phoenix, Arizona. Credentials: M.D..
How much does Gwen Grimsby, M.D. prescribe under Medicare Part D? ▼
In 2023, Gwen Grimsby, M.D. wrote 122 Medicare Part D claims totaling $35K in drug costs for N/A beneficiaries.
Where is Gwen Grimsby, M.D. located? ▼
Gwen Grimsby, M.D. is located at 5779 E MAYO BLVD, Phoenix, AZ, 85054. Phone: (480) 301-8000.
What is Gwen Grimsby, M.D.'s NPI number? ▼
Gwen Grimsby, M.D.'s National Provider Identifier (NPI) is 1740448703, issued on 05/27/2008.
Does Gwen Grimsby, M.D. prescribe more brand-name or generic drugs? ▼
Gwen Grimsby, M.D.'s prescribing is 37% brand-name and 63% generic drugs by claim count, with $32K in brand drug costs.
How many Pediatric Urology Physician providers are there in the US? ▼
There are 349 Pediatric Urology Physician providers across 44 states in the US. The average Pediatric Urology Physician provider writes 654 Medicare Part D claims per year.
What drugs does Gwen Grimsby, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gwen Grimsby, M.D.'s most frequently prescribed drugs include Oxybutynin Chloride Er, Nitrofurantoin, Myrbetriq. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gwen Grimsby, M.D. accept Medicare? ▼
Gwen Grimsby, M.D. appears in CMS Medicare data with 122 Part D claims and N/A Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gwen Grimsby, M.D.'s credentials? ▼
Gwen Grimsby, M.D.'s NPI is 1740448703 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.