NPI registry status
Active
2026 NPPES data Urology Physician NPI 1396977328 M.D., M.S.
Verify on CMS → Gregory Auffenberg, M.D., M.S.
Urology Physician in Saint Louis, Missouri.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 13,367 in 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
990
Medicare Part D claims · 241 beneficiaries · Urology Physician avg: 1K
Generic prescribing
81%
generic claims · 19% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$1.1K
42 payments · CMS Open Payments (Sunshine Act)
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
Gregory Auffenberg, M.D., M.S. filed 990 Medicare Part D claims in 2023 as a Urology Physician in Saint Louis, Missouri, prescribing 81% generic.
- 990
- Part D claims, 2023
- 81%
- generic prescribing
- Likely
- board-certified (heuristic)
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.
Gregory Auffenberg, M.D., M.S.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
990 Top 25% higher than 75% 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 certification likely (heuristic, not verified)
Gregory Auffenberg, M.D., M.S. 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 Gregory Auffenberg, M.D., M.S.?
Quality data not reportedPrimary specialty
Urology Physician
Medicare Part D claims
990 23% vs specialty avg
Specialty distribution in Missouri
How Urology Physician compares to other specialties among Missouri 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 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).
Gregory Auffenberg, M.D., M.S. appears in the CMS NPPES registry as a Urology Physician provider holding M.D., M.S. credentials at 12855 N 40 DR STE 350, Saint Louis, MO, 63141, with a listed phone of (314) 567-6071. NPI 1396977328 was issued on 08/08/2009.
Medicare Part D records for calendar year 2023 show 990 prescription claims written by this provider, covering 241 Medicare beneficiaries and totaling roughly $1.5 million in drug spend, split 19% brand-name and 81% generic by claim count, with an opioid prescribing rate of 1.7%.
Urology Physician is a mid-sized specialty nationwide, with 13,367 enrolled providers across 54 states and an average of 1,280 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 | 1396977328 |
|---|---|
| Specialty | Urology Physician |
| Credentials | M.D., M.S. |
| Gender | Male |
| NPI Issued | 08/08/2009 |
Hospital and facility affiliations
Facilities where Gregory Auffenberg, M.D., M.S. 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.
Urology OF St Louis Inc
Saint Louis, MO
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 Gregory Auffenberg, M.D., M.S.. Source: openpaymentsdata.cms.gov.
Total received
$1.1K
Largest payer
UROGEN PHARMA, 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
Gregory Auffenberg, M.D., M.S. - brand share 19.0%
Urology Physician average
19% brand-name claims vs 81% generic, on 990 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.
990
Total Claims
$1.5M
Total Drug Cost
241
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,918
- Total Day Supply
- 54,548
- Brand vs Generic
- 19% brand / 81% generic
- Brand Drug Cost
- $1.4M
- Generic Drug Cost
- $23K
- Opioid Claims
- 17 (1.7% rate)
- Antibiotic Claims
- 105
Patient Demographics
- Average Patient Age
- 75.6 years
- Avg HCC Risk Score
- 1.58
- Gender Split
- 14% female / 86% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gregory Auffenberg, M.D., M.S. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tamsulosin Hcl
Tamsulosin Hcl
353 claims
- Finasteride 126
Finasteride
126 claims
- Xtandi 89
Xtandi
89 claims
- Oxybutynin Chlorid… 82
Oxybutynin Chloride Er
82 claims
- Myrbetriq 56
Myrbetriq
56 claims
- Orgovyx 26
Orgovyx
26 claims
- Ciprofloxacin Hcl 25
Ciprofloxacin Hcl
25 claims
- Cephalexin 24
Cephalexin
24 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 353 |
| Finasteride | 126 |
| Xtandi Enzalutamide | 89 |
| Oxybutynin Chloride Er Oxybutynin Chloride | 82 |
| Myrbetriq Mirabegron | 56 |
| Orgovyx Relugolix | 26 |
| Ciprofloxacin Hcl | 25 |
| Cephalexin | 24 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 21 |
| Alfuzosin Hcl Er Alfuzosin Hcl | 20 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Urology Physician Overview
How Gregory Auffenberg, M.D., M.S. fits within the Urology Physician landscape nationally.
13,367
Urology Physician Providers in US
54
States with Urology Physician
1,280
Avg Claims per Provider
Gregory Auffenberg, M.D., M.S.'s 990 claims are below the specialty average of 1,280.
Nearby Urology Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Auffenberg.
Dr. Michael Aberger
M.D.
Saint Joseph, MO
Dr. Kent Adkins
MD
Saint Louis, MO
Dr. Gautum Agarwal
MD
Saint Louis, MO
Dr. Thomas Ahmann
MD
Mexico, MO
Dr. Yousef Al-Shraideh
MD
Saint Louis, MO
Compare Urology 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 Missouri medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Urology 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 Gregory Auffenberg, M.D., M.S.'s specialty? ▼
Gregory Auffenberg, M.D., M.S. specializes in Urology Physician and practices in Saint Louis, Missouri. Credentials: M.D., M.S..
How much does Gregory Auffenberg, M.D., M.S. prescribe under Medicare Part D? ▼
In 2023, Gregory Auffenberg, M.D., M.S. wrote 990 Medicare Part D claims totaling $1.5M in drug costs for 241 beneficiaries.
Where is Gregory Auffenberg, M.D., M.S. located? ▼
Gregory Auffenberg, M.D., M.S. is located at 12855 N 40 DR STE 350, Saint Louis, MO, 63141. Phone: (314) 567-6071.
What is Gregory Auffenberg, M.D., M.S.'s NPI number? ▼
Gregory Auffenberg, M.D., M.S.'s National Provider Identifier (NPI) is 1396977328, issued on 08/08/2009.
Does Gregory Auffenberg, M.D., M.S. prescribe more brand-name or generic drugs? ▼
Gregory Auffenberg, M.D., M.S.'s prescribing is 19% brand-name and 81% generic drugs by claim count, with $1.4M in brand drug costs.
Does Gregory Auffenberg, M.D., M.S. prescribe opioids? ▼
Yes, Gregory Auffenberg, M.D., M.S. had 17 opioid claims in 2023 with an opioid prescribing rate of 1.7%.
How many Urology Physician providers are there in the US? ▼
There are 13,367 Urology Physician providers across 54 states in the US. The average Urology Physician provider writes 1,280 Medicare Part D claims per year.
What drugs does Gregory Auffenberg, M.D., M.S. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gregory Auffenberg, M.D., M.S.'s most frequently prescribed drugs include Tamsulosin Hcl, Finasteride, Xtandi. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gregory Auffenberg, M.D., M.S. accept Medicare? ▼
Gregory Auffenberg, M.D., M.S. appears in CMS Medicare data with 990 Part D claims and 241 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gregory Auffenberg, M.D., M.S.'s credentials? ▼
Gregory Auffenberg, M.D., M.S.'s NPI is 1396977328 with credentials M.D., M.S.. 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.
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.