NPI registry status
Active
2026 NPPES data Critical Care Medicine (Internal Medicine) Physician NPI 1861758526 M.D.
Verify on CMS → Keith Ferguson, M.D.
Critical Care Medicine (Internal Medicine) 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 6,646 in Critical Care Medicine (Internal Medicine) 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
281
Medicare Part D claims · 44 beneficiaries · Critical Care Medicine (Internal Medicine) Physician avg: 1K
Generic prescribing
33%
generic claims · 67% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Keith Ferguson, M.D. filed 281 Medicare Part D claims in 2023 as a Critical Care Medicine (Internal Medicine) Physician in Saint Louis, Missouri, prescribing 33% generic.
- 281
- Part D claims, 2023
- 33%
- 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.
Keith Ferguson, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
281 49th percentile higher than 49% 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)
Keith Ferguson, 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 Keith Ferguson, M.D.?
Quality data not reportedPrimary specialty
Critical Care Medicine (Internal Medicine) Physician
Medicare Part D claims
281 74% vs specialty avg
Specialty distribution in Missouri
How Critical Care Medicine (Internal Medicine) 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 Critical Care Medicine (Internal Medicine) 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).
Keith Ferguson, M.D. appears in the CMS NPPES registry as a Critical Care Medicine (Internal Medicine) Physician provider holding M.D. credentials at 3660 VISTA AVE, Saint Louis, MO, 63110, with a listed phone of (314) 977-6100. NPI 1861758526 was issued on 04/06/2012.
Medicare Part D records for calendar year 2023 show 281 prescription claims written by this provider, covering 44 Medicare beneficiaries and totaling roughly $327K in drug spend, split 67% brand-name and 33% generic by claim count.
Critical Care Medicine (Internal Medicine) Physician is a mid-sized specialty nationwide, with 6,646 enrolled providers across 53 states and an average of 1,069 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 | 1861758526 |
|---|---|
| Specialty | Critical Care Medicine (Internal Medicine) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 04/06/2012 |
Hospital and facility affiliations
Facilities where Keith Ferguson, 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.
Ssm Health Care Group
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).
Brand vs generic prescribing mix · Brand-heavy
Keith Ferguson, M.D. - brand share 67.0%
Critical Care Medicine (Internal Medicine) Physician average
67% brand-name claims vs 33% generic, on 281 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.
281
Total Claims
$327K
Total Drug Cost
44
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 395
- Total Day Supply
- 11,087
- Brand vs Generic
- 67% brand / 33% generic
- Brand Drug Cost
- $318K
- Generic Drug Cost
- $9K
Patient Demographics
- Average Patient Age
- 67.3 years
- Avg HCC Risk Score
- 2.14
- Gender Split
- 75% female / 25% male
- Age Distribution
- <65: 13, 65-74: 21, 75-84: N/A, 85+: N/A
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Keith Ferguson, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Albuterol Sulfate …
Albuterol Sulfate Hfa
67 claims
- Trelegy Ellipta
Trelegy Ellipta
40 claims
- Symbicort
Symbicort
37 claims
- Dupixent Pen 12
Dupixent Pen
12 claims
- Breo Ellipta 11
Breo Ellipta
11 claims
- Breztri Aerosphere 11
Breztri Aerosphere
11 claims
- Wixela Inhub 11
Wixela Inhub
11 claims
| Drug | Claims |
|---|---|
| Albuterol Sulfate Hfa Albuterol Sulfate | 67 |
| Trelegy Ellipta Fluticasone/Umeclidin/Vilanter | 40 |
| Symbicort Budesonide/Formoterol Fumarate | 37 |
| Dupixent Pen Dupilumab | 12 |
| Breo Ellipta Fluticasone/Vilanterol | 11 |
| Breztri Aerosphere Budesonide/Glycopyr/Formoterol | 11 |
| Wixela Inhub Fluticasone Propion/Salmeterol | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Critical Care Medicine (Internal Medicine) Physician in MO →
All providers in Missouri →
Compare specialties →
Critical Care Medicine (Internal Medicine) Physician Overview
How Keith Ferguson, M.D. fits within the Critical Care Medicine (Internal Medicine) Physician landscape nationally.
6,646
Critical Care Medicine (Internal Medicine) Physician Providers in US
53
States with Critical Care Medicine (Internal Medicine) Physician
1,069
Avg Claims per Provider
Keith Ferguson, M.D.'s 281 claims are below the specialty average of 1,069.
Nearby Critical Care Medicine (Internal Medicine) Physician Providers in Missouri
Other clinicians with the same primary specialty enrolled in Missouri, drawn from the same CMS NPPES roster as Ferguson.
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 Critical Care Medicine (Internal Medicine) 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore Missouri
Frequently Asked Questions
What is Keith Ferguson, M.D.'s specialty? ▼
Keith Ferguson, M.D. specializes in Critical Care Medicine (Internal Medicine) Physician and practices in Saint Louis, Missouri. Credentials: M.D..
How much does Keith Ferguson, M.D. prescribe under Medicare Part D? ▼
In 2023, Keith Ferguson, M.D. wrote 281 Medicare Part D claims totaling $327K in drug costs for 44 beneficiaries.
Where is Keith Ferguson, M.D. located? ▼
Keith Ferguson, M.D. is located at 3660 VISTA AVE, Saint Louis, MO, 63110. Phone: (314) 977-6100.
What is Keith Ferguson, M.D.'s NPI number? ▼
Keith Ferguson, M.D.'s National Provider Identifier (NPI) is 1861758526, issued on 04/06/2012.
Does Keith Ferguson, M.D. prescribe more brand-name or generic drugs? ▼
Keith Ferguson, M.D.'s prescribing is 67% brand-name and 33% generic drugs by claim count, with $318K in brand drug costs.
How many Critical Care Medicine (Internal Medicine) Physician providers are there in the US? ▼
There are 6,646 Critical Care Medicine (Internal Medicine) Physician providers across 53 states in the US. The average Critical Care Medicine (Internal Medicine) Physician provider writes 1,069 Medicare Part D claims per year.
What drugs does Keith Ferguson, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Keith Ferguson, M.D.'s most frequently prescribed drugs include Albuterol Sulfate Hfa, Trelegy Ellipta, Symbicort. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Keith Ferguson, M.D. accept Medicare? ▼
Keith Ferguson, M.D. appears in CMS Medicare data with 281 Part D claims and 44 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Keith Ferguson, M.D.'s credentials? ▼
Keith Ferguson, M.D.'s NPI is 1861758526 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
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.