NPI registry status
Active
2026 NPPES data Medical Toxicology (Emergency Medicine) Physician NPI 1699064857 M.D.
Verify on CMS → Katherine Welker, M.D.
Medical Toxicology (Emergency Medicine) Physician in Chicago, Illinois.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 228 in Medical Toxicology (Emergency 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
133
Medicare Part D claims · 79 beneficiaries · Medical Toxicology (Emergency Medicine) Physician avg: 329
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Katherine Welker, M.D. filed 133 Medicare Part D claims in 2023 as a Medical Toxicology (Emergency Medicine) Physician in Chicago, Illinois.
- 133
- Part D claims, 2023
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.
Katherine Welker, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
133 35th percentile higher than 35% 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-eligible specialty (heuristic, not verified)
Katherine Welker, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Katherine Welker, M.D.?
Quality data not reportedPrimary specialty
Medical Toxicology (Emergency Medicine) Physician
Medicare Part D claims
133 60% vs specialty avg
Specialty distribution in Illinois
How Medical Toxicology (Emergency Medicine) Physician compares to other specialties among Illinois 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 Medical Toxicology (Emergency 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).
Katherine Welker, M.D. appears in the CMS NPPES registry as a Medical Toxicology (Emergency Medicine) Physician provider holding M.D. credentials at 1917 W EVERGREEN AVE, Chicago, IL, 60622, with a listed phone of (619) 201-3982. NPI 1699064857 was issued on 03/28/2011.
Medicare Part D records for calendar year 2023 show 133 prescription claims written by this provider, covering 79 Medicare beneficiaries and totaling roughly $4K in drug spend, with an opioid prescribing rate of 15.8%.
Medical Toxicology (Emergency Medicine) Physician is a narrow specialty nationwide, with 228 enrolled providers across 39 states and an average of 329 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 | 1699064857 |
|---|---|
| Specialty | Medical Toxicology (Emergency Medicine) Physician |
| Credentials | M.D. |
| Gender | Female |
| NPI Issued | 03/28/2011 |
License & disciplinary context - Illinois IDFPR 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~42K Illinois medical licensees in 2023 - they are NOT specific to Katherine Welker, M.D.. To verify Katherine Welker, M.D.'s current license status, search the IDFPR public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
106
Total board actions, Illinois 2023
Across 103 cases
2.52
Actions per 1,000 licensees
Illinois statewide rate
probation
Most common action type
38 cases
IDFPR publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the Illinois disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
133
Total Claims
$4K
Total Drug Cost
79
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 144
- Total Day Supply
- 1,794
- Generic Drug Cost
- $2K
- Opioid Claims
- 21 (15.8% rate)
- Antibiotic Claims
- 34
Patient Demographics
- Average Patient Age
- 74.3 years
- Avg HCC Risk Score
- 1.63
- Gender Split
- 66% female / 34% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Katherine Welker, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
18 claims
- Ondansetron Odt
Ondansetron Odt
17 claims
- Ibuprofen
Ibuprofen
13 claims
- Cefpodoxime Proxetil
Cefpodoxime Proxetil
11 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 18 |
| Ondansetron Odt Ondansetron | 17 |
| Ibuprofen | 13 |
| Cefpodoxime Proxetil | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Medical Toxicology (Emergency Medicine) Physician in IL →
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Medical Toxicology (Emergency Medicine) Physician Overview
How Katherine Welker, M.D. fits within the Medical Toxicology (Emergency Medicine) Physician landscape nationally.
228
Medical Toxicology (Emergency Medicine) Physician Providers in US
39
States with Medical Toxicology (Emergency Medicine) Physician
329
Avg Claims per Provider
Katherine Welker, M.D.'s 133 claims are below the specialty average of 329.
Nearby Medical Toxicology (Emergency Medicine) Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Welker.
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 Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Medical Toxicology (Emergency 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.
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Medical Specialties Explained
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Understanding Medicare Claims Data
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Frequently Asked Questions
What is Katherine Welker, M.D.'s specialty? ▼
Katherine Welker, M.D. specializes in Medical Toxicology (Emergency Medicine) Physician and practices in Chicago, Illinois. Credentials: M.D..
How much does Katherine Welker, M.D. prescribe under Medicare Part D? ▼
In 2023, Katherine Welker, M.D. wrote 133 Medicare Part D claims totaling $4K in drug costs for 79 beneficiaries.
Where is Katherine Welker, M.D. located? ▼
Katherine Welker, M.D. is located at 1917 W EVERGREEN AVE, Chicago, IL, 60622. Phone: (619) 201-3982.
What is Katherine Welker, M.D.'s NPI number? ▼
Katherine Welker, M.D.'s National Provider Identifier (NPI) is 1699064857, issued on 03/28/2011.
Does Katherine Welker, M.D. prescribe opioids? ▼
Yes, Katherine Welker, M.D. had 21 opioid claims in 2023 with an opioid prescribing rate of 15.8%.
How many Medical Toxicology (Emergency Medicine) Physician providers are there in the US? ▼
There are 228 Medical Toxicology (Emergency Medicine) Physician providers across 39 states in the US. The average Medical Toxicology (Emergency Medicine) Physician provider writes 329 Medicare Part D claims per year.
What drugs does Katherine Welker, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Katherine Welker, M.D.'s most frequently prescribed drugs include Hydrocodone-Acetaminophen, Ondansetron Odt, Ibuprofen. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Katherine Welker, M.D. accept Medicare? ▼
Katherine Welker, M.D. appears in CMS Medicare data with 133 Part D claims and 79 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Katherine Welker, M.D.'s credentials? ▼
Katherine Welker, M.D.'s NPI is 1699064857 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.