NPI registry status
Active
2026 NPPES data Hospitalist Physician NPI 1336181395 M.D.
Verify on CMS → Mark Switzer, M.D.
Hospitalist Physician in Bolingbrook, 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 17,950 in Hospitalist 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
70
Medicare Part D claims · 27 beneficiaries · Hospitalist Physician avg: 940
MIPS score
75/100
CMS neutral threshold · no category scores published
What the federal data shows
Mark Switzer, M.D. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 70 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 70
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥0th
- 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 Mark Switzer, M.D.
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 1336181395), first enumerated 06/12/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 70 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- 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
2 CMS Care Compare hospital affiliations on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- State context
State board disciplinary context
Illinois statewide board action statistics are published annually — these figures describe aggregate state activity, not Mark Switzer, M.D.'s individual license status. Verify directly with the state medical board.
Source: IDFPR annual report 2023
- 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.
Compare Switzer with other Hospitalist Physician providers
Same primary specialty, same federal CMS NPPES roster.
Also enrolled in Illinois
- Dr. Hasan Abad, D.O. Chicago, IL
- Dr. Osamah Abdallah, M.D. Maywood, IL
- Dr. Hossam Abdel Aziz, MD Winfield, IL
- Dr. Gina Abraham, MD Franklin Park, IL
- Rebecca Abraham, PA-C Chicago, IL
- Dr. Maria Abu Nseir, MD Rock Island, IL
Other specialties in Bolingbrook: Physical Therapist (109) · Pharmacist (51) · Clinical Social Worker (41) · Speech-Language Pathologist (36)
CMS NPPES provider registry desk
NPI 1336181395 · Hospitalist Physician
NPI-10 · ENUM-LEGACY · TAX-MID · MIPS-NEUTRAL · RX-TRACE · BOOK-LIGHT · PHOTO-ENUM
- NPI-10 1336181395
- ENUM-LEGACY 2006
- TAX-MID 18K Hospitalist Physician
- MIPS-NEUTRAL 75/100
- RX-TRACE 70
- BOOK-LIGHT 880 in Illinois
- PHOTO-ENUM Hari Manne, MD · 2006
Mark Switzer, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
70 ≥ 0th percentile 0% 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)
Mark Switzer, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 2 hospital affiliations - 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 Mark Switzer, M.D.?
CMS neutral score, not measuredPrimary specialty
Hospitalist Physician
Medicare Part D claims
70 93% vs specialty avg
MIPS final score
75/100
Specialty distribution in Illinois
How Hospitalist Physician compares to other specialties among Illinois providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
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 | 1336181395 |
|---|---|
| Specialty | Hospitalist Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 06/12/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Group practice
Hospital and facility affiliations
Facilities where Mark Switzer, 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.
Advance Inpatient Medicine LLC
Bolingbrook, IL
Knd Development 59 LLC
Northlake, 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 Mark Switzer, M.D.. To verify Mark Switzer, 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 2024.
70
Total Claims
$597
Total Drug Cost
27
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 70
- Total Day Supply
- 1,285
- Generic Drug Cost
- $586
- Antibiotic Claims
- 12
Patient Demographics
- Average Patient Age
- 78.3 years
- Avg HCC Risk Score
- 1.94
- Gender Split
- 59% female / 41% male
Hospitalist Physician Overview
How Mark Switzer, M.D. fits within the Hospitalist Physician landscape nationally.
17,950
Hospitalist Physician Providers in US
54
States with Hospitalist Physician
940
Avg Claims per Provider
Mark Switzer, M.D.'s 70 claims are below the specialty average of 940.
Nationwide Hospitalist Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Switzer, both outside Illinois so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Hospitalist Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Switzer.
One of 880 Hospitalist Physician providers enrolled in Illinois, 11 are shown on this page.
Dr. Jabeen Abutalib
M.D.
North Chicago, IL
Christine Acob
Chicago, IL
Dr. Saad Adoni
MD
Urbana, IL
Dr. Arnold Agapito
MD
Mattoon, IL
Dr. Rahul Agarwal
M.D.
Naperville, IL
Compare Hospitalist Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Mark Switzer, M.D.'s specialty? ▼
Mark Switzer, M.D. specializes in Hospitalist Physician and practices in Bolingbrook, Illinois. Credentials: M.D..
How much does Mark Switzer, M.D. prescribe under Medicare Part D? ▼
In 2024, Mark Switzer, M.D. wrote 70 Medicare Part D claims totaling $597 in drug costs for 27 beneficiaries.
What is Mark Switzer, M.D.'s Medicare quality score? ▼
Mark Switzer, M.D. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. 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 Mark Switzer, M.D. located? ▼
Mark Switzer, M.D. is located at 1000 REMINGTON BLVD, Bolingbrook, IL, 60440. Phone: (630) 312-7755.
What is Mark Switzer, M.D.'s NPI number? ▼
Mark Switzer, M.D.'s National Provider Identifier (NPI) is 1336181395, issued on 06/12/2006.
How many Hospitalist Physician providers are there in the US? ▼
There are 17,950 Hospitalist Physician providers across 54 states in the US. The average Hospitalist Physician provider writes 940 Medicare Part D claims per year.
Does Mark Switzer, M.D. accept Medicare? ▼
Mark Switzer, M.D. appears in CMS Medicare data with 70 Part D claims and 27 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Mark Switzer, M.D.'s credentials? ▼
Mark Switzer, M.D.'s NPI is 1336181395 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 (2024). 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 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.