NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1003926296 MD
Verify on CMS → Chong Pak, MD
Internal Medicine Physician in Arlington Heights, 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 172,737 in 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
230
Medicare Part D claims · 127 beneficiaries · Internal Medicine Physician avg: 3K
What the federal data shows
Chong Pak, MD filed 230 Medicare Part D claims in 2023 as an Internal Medicine Physician in Arlington Heights, Illinois.
- 230
- Part D claims, 2023
- Likely
- board-certified (heuristic)
- ≥49th
- 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.
CMS NPPES provider registry desk
NPI 1003926296 · Internal Medicine Physician
NPI-10 · ENUM-LEGACY · TAX-MEGA · RX-LIGHT · BOOK-MID · PHOTO-ENUM
- NPI-10 1003926296
- ENUM-LEGACY 2006
- TAX-MEGA 173K Internal Medicine
- RX-LIGHT 230
- BOOK-MID 8,383 in Illinois
- PHOTO-ENUM Stacey Watson · 2006
Chong Pak, MD's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
230 ≥ 49th percentile 49% of 1,370,886 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 · 2023
✓
Board certification likely (heuristic, not verified)
Chong Pak, MD practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Chong Pak, MD?
Quality data not reportedPrimary specialty
Internal Medicine Physician
Medicare Part D claims
230 92% vs specialty avg
Specialty distribution in Illinois
How Internal 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 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).
Practice Address
Provider Details
| NPI | 1003926296 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 08/30/2006 |
Hospital and facility affiliations
Facilities where Chong Pak, 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.
Cook Physician Services, P.C.
Hoffman Estates, IL
Rockford Health Physicians
Rockford, 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 Chong Pak, MD. To verify Chong Pak, 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.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
230
Total Claims
$15K
Total Drug Cost
127
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 261
- Total Day Supply
- 5,359
- Generic Drug Cost
- $4K
- Opioid Claims
- 34 (14.8% rate)
- Antibiotic Claims
- 30
Patient Demographics
- Average Patient Age
- 71.5 years
- Avg HCC Risk Score
- 2.17
- Gender Split
- 52% female / 48% male
- Age Distribution
- <65: 23, 65-74: 54, 75-84: 31, 85+: 19
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Chong Pak, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
25 claims
- Eliquis
Eliquis
18 claims
- Furosemide
Furosemide
15 claims
- Amlodipine Besylate
Amlodipine Besylate
13 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 25 |
| Eliquis Apixaban | 18 |
| Furosemide | 15 |
| Amlodipine Besylate | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Internal Medicine Physician Overview
How Chong Pak, MD fits within the Internal Medicine Physician landscape nationally.
172,737
Internal Medicine Physician Providers in US
56
States with Internal Medicine Physician
2,716
Avg Claims per Provider
Chong Pak, MD's 230 claims are below the specialty average of 2,716.
Nationwide Internal Medicine Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Pak, both outside Illinois so the neighborhoods are not geographic containment.
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Internal Medicine Physician Providers in Illinois
Other clinicians with the same primary specialty enrolled in Illinois, drawn from the same CMS NPPES roster as Pak.
One of 8,383 Internal Medicine Physician providers enrolled in Illinois, 5 are shown here.
Dr. Hasan Abad
D.O.
Chicago, IL
Dr. Peter Abadeer
D.O.
Bloomington, IL
Dr. Pamela Abadi
D.O.
Winfield, IL
Dr. Motaz Abas
MD
Peoria, IL
Dr. Estefania Abasolo Lopez
MD
Chicago, IL
Compare Internal Medicine Physician nationally: see state-by-state distribution →
Frequently Asked Questions
What is Chong Pak, MD's specialty? ▼
Chong Pak, MD specializes in Internal Medicine Physician and practices in Arlington Heights, Illinois. Credentials: MD.
How much does Chong Pak, MD prescribe under Medicare Part D? ▼
In 2023, Chong Pak, MD wrote 230 Medicare Part D claims totaling $15K in drug costs for 127 beneficiaries.
Where is Chong Pak, MD located? ▼
Chong Pak, MD is located at 800 W CENTRAL RD, Arlington Heights, IL, 60005. Phone: (847) 618-8400.
What is Chong Pak, MD's NPI number? ▼
Chong Pak, MD's National Provider Identifier (NPI) is 1003926296, issued on 08/30/2006.
Does Chong Pak, MD prescribe opioids? ▼
Yes, Chong Pak, MD had 34 opioid claims in 2023 with an opioid prescribing rate of 14.8%.
How many Internal Medicine Physician providers are there in the US? ▼
There are 172,737 Internal Medicine Physician providers across 56 states in the US. The average Internal Medicine Physician provider writes 2,716 Medicare Part D claims per year.
What drugs does Chong Pak, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Chong Pak, MD's most frequently prescribed drugs include Hydrocodone-Acetaminophen, Eliquis, Furosemide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Chong Pak, MD accept Medicare? ▼
Chong Pak, MD appears in CMS Medicare data with 230 Part D claims and 127 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Chong Pak, MD's credentials? ▼
Chong Pak, MD's NPI is 1003926296 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.
- 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.