NPI registry status
Active
2026 NPPES data Gastroenterology Physician NPI 1427076082 MD
Verify on CMS → Susannah Spiess, MD
Gastroenterology Physician in Glenview, 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 16,601 in Gastroenterology 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
546
Medicare Part D claims · 407 beneficiaries · Gastroenterology Physician avg: 833
Generic prescribing
80%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
93.1/100
▲ 10 pts above national avg 83.5 · Exceptional
Source: CMS Medicare Part D Prescriber Public Use File, 2023
What the federal data shows
Susannah Spiess, MD reported a CMS MIPS final score of 93.1/100 - above the 83.5 national average - and filed 546 Medicare Part D claims in 2023.
- 93.1/100
- MIPS score · +10 vs avg
- 546
- Part D claims, 2023
- 80%
- 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.
Susannah Spiess, MD's MIPS score vs every measured U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure. Clinicians whose score CMS assigned without scoring any category are excluded.
93 Top 31% higher than 69% of 454,083 measured providers
Each bar is a band; taller bars hold more measured 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 Susannah Spiess, MD sits
This provider among gastroenterology physician peers
Across the 5,560 gastroenterology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Susannah Spiess, MD writes more Part D claims than 37% of them and scores higher on MIPS quality than 72% - placing this provider in the lower-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 gastroenterology physician peer from a representative sample of 60; the gold marker is Susannah Spiess, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Susannah Spiess, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 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 Susannah Spiess, MD?
High performer (top quartile)Primary specialty
Gastroenterology Physician
Medicare Part D claims
546 34% vs specialty avg
MIPS final score
93.1/100 9.6 pts vs avg
Specialty distribution in Illinois
How Gastroenterology Physician compares to other specialties among Illinois providers
Medicare quality performance, MIPS
Susannah Spiess, MD's 2023 MIPS final score plotted against the Gastroenterology Physician national average
- MIPS Final Score
- 93.1/100
- vs 83.5 national avg · 2023 performance year
MIPS final score (Gastroenterology Physician) - 93.1/100 vs national avg 83.5
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).
Susannah Spiess, MD appears in the CMS NPPES registry as a Gastroenterology Physician provider holding MD credentials at 2100 PFINGSTEN RD, Glenview, IL, 60026, with a listed phone of (847) 657-1900. NPI 1427076082 was issued on 07/18/2006.
Medicare Part D records for calendar year 2023 show 546 prescription claims written by this provider, covering 407 Medicare beneficiaries and totaling roughly $67K in drug spend, split 20% brand-name and 80% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 93.1/100 for the 2023 performance year (Quality 80.8), compared with the 83.5 average among clinicians with a measured score.
Gastroenterology Physician is a mid-sized specialty nationwide, with 16,601 enrolled providers across 54 states and an average of 833 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 | 1427076082 |
|---|---|
| Specialty | Gastroenterology Physician |
| Credentials | MD |
| Gender | Female |
| NPI Issued | 07/18/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
93.0872
Final Score
Measured-score avg: 83.5
80.7919
Quality
100
Promoting Interoperability
Reporting: Alternative Payment Model
Hospital and facility affiliations
Facilities where Susannah Spiess, 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.
Endeavor Health Medical Group
Glenview, IL
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 Susannah Spiess, MD. To verify Susannah Spiess, MD'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.
Brand vs generic prescribing mix · Typical
Susannah Spiess, MD - brand share 20.0%
Gastroenterology Physician average
20% brand-name claims vs 80% generic, on 546 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.
546
Total Claims
$67K
Total Drug Cost
407
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 692
- Total Day Supply
- 8,719
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $29K
- Generic Drug Cost
- $38K
Patient Demographics
- Average Patient Age
- 73.3 years
- Avg HCC Risk Score
- 0.74
- Gender Split
- 77% female / 23% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Susannah Spiess, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Peg 3350-Electrolyte
Peg 3350-Electrolyte
72 claims
- Mesalamine
Mesalamine
30 claims
- Ondansetron Hcl 27
Ondansetron Hcl
27 claims
- Pantoprazole Sodium 18
Pantoprazole Sodium
18 claims
- Famotidine 14
Famotidine
14 claims
- Omeprazole 12
Omeprazole
12 claims
- Balsalazide Disodium 11
Balsalazide Disodium
11 claims
| Drug | Claims |
|---|---|
| Peg 3350-Electrolyte Sodium Chloride/Nahco3/Kcl/Peg | 72 |
| Mesalamine | 30 |
| Ondansetron Hcl | 27 |
| Pantoprazole Sodium | 18 |
| Famotidine | 14 |
| Omeprazole | 12 |
| Balsalazide Disodium | 11 |
| Gavilyte-C "Peg3350/Sod Sulf | N/A |
| Sod Sulf-Potass Sulf-Mag Sulf "Sodium | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gastroenterology Physician Overview
How Susannah Spiess, MD fits within the Gastroenterology Physician landscape nationally.
16,601
Gastroenterology Physician Providers in US
54
States with Gastroenterology Physician
833
Avg Claims per Provider
Susannah Spiess, MD's 546 claims are below the specialty average of 833.
Nearby Gastroenterology Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Spiess.
Dr. Abdul Aadam
M.D.
Chicago, IL
Dr. Richard Aaronson
M.D.
Olympia Fields, IL
Dr. Abdelhai Abdelqader
MD
Maywood, IL
Dr. Mustafa Abdul-Hussein
MD
Mattoon, IL
Dr. Ayokunle Abegunde
M.D.
Maywood, IL
Compare Gastroenterology 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 Gastroenterology 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 Susannah Spiess, MD's specialty? ▼
Susannah Spiess, MD specializes in Gastroenterology Physician and practices in Glenview, Illinois. Credentials: MD.
How much does Susannah Spiess, MD prescribe under Medicare Part D? ▼
In 2023, Susannah Spiess, MD wrote 546 Medicare Part D claims totaling $67K in drug costs for 407 beneficiaries.
What is Susannah Spiess, MD's Medicare quality score? ▼
Susannah Spiess, MD has a CMS MIPS Final Score of 93.1/100 (Quality: 80.8). The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Susannah Spiess, MD located? ▼
Susannah Spiess, MD is located at 2100 PFINGSTEN RD, Glenview, IL, 60026. Phone: (847) 657-1900.
What is Susannah Spiess, MD's NPI number? ▼
Susannah Spiess, MD's National Provider Identifier (NPI) is 1427076082, issued on 07/18/2006.
Does Susannah Spiess, MD prescribe more brand-name or generic drugs? ▼
Susannah Spiess, MD's prescribing is 20% brand-name and 80% generic drugs by claim count, with $29K in brand drug costs.
How many Gastroenterology Physician providers are there in the US? ▼
There are 16,601 Gastroenterology Physician providers across 54 states in the US. The average Gastroenterology Physician provider writes 833 Medicare Part D claims per year.
What drugs does Susannah Spiess, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Susannah Spiess, MD's most frequently prescribed drugs include Peg 3350-Electrolyte, Mesalamine, Ondansetron Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Susannah Spiess, MD accept Medicare? ▼
Susannah Spiess, MD appears in CMS Medicare data with 546 Part D claims and 407 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Susannah Spiess, MD's credentials? ▼
Susannah Spiess, MD's NPI is 1427076082 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.
- 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.