NPI registry status
Active
2026 NPPES data Geriatric Psychiatry Physician NPI 1942392931 MD
Verify on CMS → William Irvin, MD
Geriatric Psychiatry 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 785 in Geriatric Psychiatry 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
2K
Medicare Part D claims · 100 beneficiaries · Geriatric Psychiatry Physician avg: 2K
Generic prescribing
97%
generic claims · 3% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$23.73
1 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
William Irvin, MD filed 1,891 Medicare Part D claims in 2023 as a Geriatric Psychiatry Physician in Saint Louis, Missouri, prescribing 97% generic.
- 2K
- Part D claims, 2023
- 97%
- 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.
William Irvin, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
1,891 Top 17% higher than 83% 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)
William Irvin, MD 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 William Irvin, MD?
Quality data not reportedPrimary specialty
Geriatric Psychiatry Physician
Medicare Part D claims
1,891 19% vs specialty avg
Specialty distribution in Missouri
How Geriatric Psychiatry 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 Geriatric Psychiatry 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).
William Irvin, MD appears in the CMS NPPES registry as a Geriatric Psychiatry Physician provider holding MD credentials at 11477 OLDE CABIN RD STE 210, Saint Louis, MO, 63141, with a listed phone of (314) 997-5208. NPI 1942392931 was issued on 09/28/2006.
Medicare Part D records for calendar year 2023 show 1,891 prescription claims written by this provider, covering 100 Medicare beneficiaries and totaling roughly $78K in drug spend, split 3% brand-name and 97% generic by claim count.
Geriatric Psychiatry Physician is a narrow specialty nationwide, with 785 enrolled providers across 46 states and an average of 1,586 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 | 1942392931 |
|---|---|
| Specialty | Geriatric Psychiatry Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 09/28/2006 |
Hospital and facility affiliations
Facilities where William Irvin, 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.
Ssm Health Care St Louis
Fenton, 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 William Irvin, MD. Source: openpaymentsdata.cms.gov.
Total received
$24
Largest payer
Janssen Pharmaceuticals, 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 · Generic-heavy
William Irvin, MD - brand share 3.0%
Geriatric Psychiatry Physician average
3% brand-name claims vs 97% generic, on 1,891 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.
1,891
Total Claims
$78K
Total Drug Cost
100
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,646
- Total Day Supply
- 77,786
- Brand vs Generic
- 3% brand / 97% generic
- Brand Drug Cost
- $19K
- Generic Drug Cost
- $59K
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 1.68
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What William Irvin, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Alprazolam
Alprazolam
151 claims
- Duloxetine Hcl
Duloxetine Hcl
121 claims
- Fluoxetine Hcl
Fluoxetine Hcl
112 claims
- Lamotrigine
Lamotrigine
104 claims
- Trazodone Hcl
Trazodone Hcl
85 claims
- Clonazepam
Clonazepam
84 claims
- Escitalopram Oxalate
Escitalopram Oxalate
81 claims
- Bupropion Xl
Bupropion Xl
79 claims
| Drug | Claims |
|---|---|
| Alprazolam | 151 |
| Duloxetine Hcl | 121 |
| Fluoxetine Hcl | 112 |
| Lamotrigine | 104 |
| Trazodone Hcl | 85 |
| Clonazepam | 84 |
| Escitalopram Oxalate | 81 |
| Bupropion Xl Bupropion Hcl | 79 |
| Quetiapine Fumarate | 77 |
| Lorazepam | 66 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Geriatric Psychiatry Physician Overview
How William Irvin, MD fits within the Geriatric Psychiatry Physician landscape nationally.
785
Geriatric Psychiatry Physician Providers in US
46
States with Geriatric Psychiatry Physician
1,586
Avg Claims per Provider
William Irvin, MD's 1,891 claims are above the specialty average of 1,586.
Nearby Geriatric Psychiatry Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Irvin.
Dr. Sameer Arain
MD
Saint Louis, MO
Dr. Vadim Baram
MD
Saint Louis, MO
Dr. Nezar El-Ruwie
M.D.
Saint Louis, MO
Dr. Dilip Gogineni
M.D.
Poplar Bluff, MO
Dr. George Grossberg
MD
Saint Louis, MO
Compare Geriatric Psychiatry 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 Geriatric Psychiatry 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 William Irvin, MD's specialty? ▼
William Irvin, MD specializes in Geriatric Psychiatry Physician and practices in Saint Louis, Missouri. Credentials: MD.
How much does William Irvin, MD prescribe under Medicare Part D? ▼
In 2023, William Irvin, MD wrote 1,891 Medicare Part D claims totaling $78K in drug costs for 100 beneficiaries.
Where is William Irvin, MD located? ▼
William Irvin, MD is located at 11477 OLDE CABIN RD STE 210, Saint Louis, MO, 63141. Phone: (314) 997-5208.
What is William Irvin, MD's NPI number? ▼
William Irvin, MD's National Provider Identifier (NPI) is 1942392931, issued on 09/28/2006.
Does William Irvin, MD prescribe more brand-name or generic drugs? ▼
William Irvin, MD's prescribing is 3% brand-name and 97% generic drugs by claim count, with $19K in brand drug costs.
How many Geriatric Psychiatry Physician providers are there in the US? ▼
There are 785 Geriatric Psychiatry Physician providers across 46 states in the US. The average Geriatric Psychiatry Physician provider writes 1,586 Medicare Part D claims per year.
What drugs does William Irvin, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, William Irvin, MD's most frequently prescribed drugs include Alprazolam, Duloxetine Hcl, Fluoxetine Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does William Irvin, MD accept Medicare? ▼
William Irvin, MD appears in CMS Medicare data with 1,891 Part D claims and 100 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify William Irvin, MD's credentials? ▼
William Irvin, MD's NPI is 1942392931 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
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.