NPI registry status
Active
2026 NPPES data Transplant Hepatology Physician NPI 1821064692
Verify on CMS → Michael Charlton
Transplant Hepatology 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 134 in Transplant Hepatology 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
489
Medicare Part D claims · 65 beneficiaries · Transplant Hepatology Physician avg: 536
MIPS score
97.7/100
▲ 15 pts above national avg 83.1 · Exceptional
Industry payments
$44.8K
12 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Michael Charlton reported a CMS MIPS final score of 97.7/100 - above the 83.1 national average - and filed 489 Medicare Part D claims in 2023.
- 97.7/100
- MIPS score · +15 vs avg
- 489
- Part D claims, 2023
- 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.
Michael Charlton's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
98 Top 15% higher than 85% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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 Merit-based Incentive Payment System (MIPS) · 2023
Where Michael Charlton sits
This provider among transplant hepatology physician peers
Across the 52 transplant hepatology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Michael Charlton writes more Part D claims than 58% of them and scores higher on MIPS quality than 77% - placing this provider in the high-volume, high-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one transplant hepatology physician peer from a representative sample of 51; the gold marker is Michael Charlton. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Michael Charlton practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Michael Charlton?
High performer (top quartile)Primary specialty
Transplant Hepatology Physician
Medicare Part D claims
489 9% vs specialty avg
MIPS final score
97.7/100 14.6 pts vs avg
Specialty distribution in Illinois
How Transplant Hepatology Physician compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Michael Charlton's 2023 MIPS final score plotted against the Transplant Hepatology Physician national average
- MIPS Final Score
- 97.7/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Transplant Hepatology Physician) - 97.7/100 vs national avg 83.1
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).
Michael Charlton appears in the CMS NPPES registry as a Transplant Hepatology Physician provider at 5841 S MARYLAND AVE, Chicago, IL, 60637, with a listed phone of (888) 824-0200. NPI 1821064692 was issued on 02/23/2006.
Medicare Part D records for calendar year 2023 show 489 prescription claims written by this provider, covering 65 Medicare beneficiaries and totaling roughly $521K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 97.7/100 for the 2023 performance year (Quality 75.4), compared with the national average of 83.1.
Transplant Hepatology Physician is a narrow specialty nationwide, with 134 enrolled providers across 36 states and an average of 536 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 | 1821064692 |
|---|---|
| Specialty | Transplant Hepatology Physician |
| Gender | Male |
| NPI Issued | 02/23/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
97.7188
Final Score
Avg: 83.1
75.4375
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
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 Michael Charlton. Source: openpaymentsdata.cms.gov.
Total received
$44.8K
Largest payer
Madrigal Pharmaceuticals
Most common payment type
Consulting Fee
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.
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 Michael Charlton. To verify Michael Charlton'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.
489
Total Claims
$521K
Total Drug Cost
65
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 773
- Total Day Supply
- 22,520
- Generic Drug Cost
- $27K
- Antibiotic Claims
- 66
Patient Demographics
- Average Patient Age
- 65.6 years
- Avg HCC Risk Score
- 3.05
- Gender Split
- 48% female / 52% male
- Age Distribution
- <65: 22, 65-74: 31, 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 Michael Charlton prescribes most
Top Medicare Part D drugs by claim count, 2023
- Xifaxan
Xifaxan
47 claims
- Ozempic
Ozempic
36 claims
- Lactulose
Lactulose
25 claims
- Furosemide
Furosemide
24 claims
- Mycophenolate Mofe…
Mycophenolate Mofetil
24 claims
- Spironolactone
Spironolactone
23 claims
- Pantoprazole Sodium
Pantoprazole Sodium
22 claims
- Vitamin D2
Vitamin D2
22 claims
| Drug | Claims |
|---|---|
| Xifaxan Rifaximin | 47 |
| Ozempic Semaglutide | 36 |
| Lactulose | 25 |
| Furosemide | 24 |
| Mycophenolate Mofetil | 24 |
| Spironolactone | 23 |
| Pantoprazole Sodium | 22 |
| Vitamin D2 Ergocalciferol (Vitamin D2) | 22 |
| Azathioprine | 17 |
| Ursodiol | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Transplant Hepatology Physician Overview
How Michael Charlton fits within the Transplant Hepatology Physician landscape nationally.
134
Transplant Hepatology Physician Providers in US
36
States with Transplant Hepatology Physician
536
Avg Claims per Provider
Michael Charlton's 489 claims are below the specialty average of 536.
Nearby Transplant Hepatology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Charlton.
Andrew Aronsohn
Chicago, IL
Dr. Maria El Gemayel
MD
Chicago, IL
Nisha Howarth
Chicago, IL
Dr. Krystina Johnson
MD
Chicago, IL
Dr. Pavithra Parthasarathy
MD
Chicago, IL
Compare Transplant Hepatology 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 Illinois medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Transplant Hepatology 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 Michael Charlton's specialty? ▼
Michael Charlton specializes in Transplant Hepatology Physician and practices in Chicago, Illinois.
How much does Michael Charlton prescribe under Medicare Part D? ▼
In 2023, Michael Charlton wrote 489 Medicare Part D claims totaling $521K in drug costs for 65 beneficiaries.
What is Michael Charlton's Medicare quality score? ▼
Michael Charlton has a CMS MIPS Final Score of 97.7/100 (Quality: 75.4). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Michael Charlton located? ▼
Michael Charlton is located at 5841 S MARYLAND AVE, Chicago, IL, 60637. Phone: (888) 824-0200.
What is Michael Charlton's NPI number? ▼
Michael Charlton's National Provider Identifier (NPI) is 1821064692, issued on 02/23/2006.
How many Transplant Hepatology Physician providers are there in the US? ▼
There are 134 Transplant Hepatology Physician providers across 36 states in the US. The average Transplant Hepatology Physician provider writes 536 Medicare Part D claims per year.
What drugs does Michael Charlton prescribe most often? ▼
Based on 2023 Medicare Part D data, Michael Charlton's most frequently prescribed drugs include Xifaxan, Ozempic, Lactulose. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Charlton accept Medicare? ▼
Michael Charlton appears in CMS Medicare data with 489 Part D claims and 65 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Charlton's credentials? ▼
Michael Charlton's NPI is 1821064692. 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.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- 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
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.