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 787 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 · 94 beneficiaries · Geriatric Psychiatry Physician avg: 2K
Generic prescribing
96%
generic claims · 4% 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, 2024
What the federal data shows
William Irvin, MD filed 1,792 Medicare Part D claims in 2024 as a Geriatric Psychiatry Physician in Saint Louis, Missouri, prescribing 96% generic.
- 2K
- Part D claims, 2024
- 96%
- generic prescribing
- Likely
- board-certified (heuristic)
- ≥82nd
- 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.
Federal trust snapshot
What official records show about William Irvin, MD
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1942392931), first enumerated 09/28/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 1,792 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$23.73 in reported industry payments (1 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1942392931 · Geriatric Psychiatry Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · RX-MID · BOOK-THIN · PHOTO-ENUM
- NPI-10 1942392931
- ENUM-LEGACY 2006
- TAX-NARROW 787
- RX-MID 1,792
- BOOK-THIN 16 in Missouri
- PHOTO-ENUM Charles Milliken, M.D. · 2006
William Irvin, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
1,792 ≥ 82nd percentile 82% of 1,416,883 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 · 2024
✓
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
1,792 13% 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).
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 4.0%
Geriatric Psychiatry Physician average
4% brand-name claims vs 96% generic, on 1,792 2024 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 2024.
1,792
Total Claims
$103K
Total Drug Cost
94
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 2,559.367
- Total Day Supply
- 75,145
- Brand vs Generic
- 4% brand / 96% generic
- Brand Drug Cost
- $68K
- Generic Drug Cost
- $35K
Patient Demographics
- Average Patient Age
- 69.1 years
- Avg HCC Risk Score
- 1.39
- Gender Split
- 57% female / 43% male
- Age Distribution
- <65: 24, 65-74: 43, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What William Irvin, MD prescribes most
Top Medicare Part D drugs by claim count, 2024
- Duloxetine Hcl
Duloxetine Hcl
132 claims
- Alprazolam
Alprazolam
118 claims
- Lamotrigine
Lamotrigine
100 claims
- Quetiapine Fumarate
Quetiapine Fumarate
97 claims
- Bupropion Xl
Bupropion Xl
91 claims
- Lorazepam
Lorazepam
84 claims
- Trazodone Hcl
Trazodone Hcl
79 claims
- Fluoxetine Hcl
Fluoxetine Hcl
78 claims
| Drug | Claims |
|---|---|
| Duloxetine Hcl | 132 |
| Alprazolam | 118 |
| Lamotrigine | 100 |
| Quetiapine Fumarate | 97 |
| Bupropion Xl Bupropion Hcl | 91 |
| Lorazepam | 84 |
| Trazodone Hcl | 79 |
| Fluoxetine Hcl | 78 |
| Escitalopram Oxalate | 65 |
| Olanzapine | 63 |
* 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.
787
Geriatric Psychiatry Physician Providers in US
46
States with Geriatric Psychiatry Physician
1,586
Avg Claims per Provider
William Irvin, MD's 1,792 claims are above the specialty average of 1,586.
Nationwide Geriatric Psychiatry Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Irvin, both outside Missouri 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 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.
One of 16 Geriatric Psychiatry Physician providers enrolled in Missouri, 5 are shown here.
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 →
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 2024, William Irvin, MD wrote 1,792 Medicare Part D claims totaling $103K in drug costs for 94 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 4% brand-name and 96% generic drugs by claim count, with $68K in brand drug costs.
How many Geriatric Psychiatry Physician providers are there in the US? ▼
There are 787 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 2024 Medicare Part D data, William Irvin, MD's most frequently prescribed drugs include Duloxetine Hcl, Alprazolam, Lamotrigine. 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 1,792 Part D claims and 94 Medicare beneficiaries in 2024. 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 (2024). 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 August 2026 (NPPES) / 2024 (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 August 2026.