NPI registry status
Active
2026 NPPES data Internal Medicine Physician NPI 1104070887 MD
Verify on CMS → You-Jen Chou, MD
Internal Medicine Physician in Baldwin Park, California.
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
804
Medicare Part D claims · 259 beneficiaries · Internal Medicine Physician avg: 3K
MIPS score
100/100
▲ 17 pts above national avg 83.1 · Exceptional
Industry payments
$1.0K
40 payments · CMS Open Payments (Sunshine Act)
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
You-Jen Chou, MD reported a CMS MIPS final score of 100/100 - above the 83.1 national average - and filed 804 Medicare Part D claims in 2023.
- 100/100
- MIPS score · +17 vs avg
- 804
- 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.
You-Jen Chou, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
100 Top 7% higher than 93% 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 You-Jen Chou, MD sits
This provider among internal medicine physician peers
Across the 36,260 internal medicine physician providers who report both Medicare Part D prescribing and a MIPS quality score, You-Jen Chou, MD writes more Part D claims than 52% of them and scores higher on MIPS quality than 93% - 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 internal medicine physician peer from a representative sample of 60; the gold marker is You-Jen Chou, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
You-Jen Chou, 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 You-Jen Chou, MD?
High performer (top quartile)Primary specialty
Internal Medicine Physician
Medicare Part D claims
804 70% vs specialty avg
MIPS final score
100/100 16.9 pts vs avg
Specialty distribution in California
How Internal Medicine Physician compares to other specialties among California providers
Medicare quality performance, MIPS
You-Jen Chou, MD's 2023 MIPS final score plotted against the Internal Medicine Physician national average
- MIPS Final Score
- 100/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Internal Medicine Physician) - 100/100 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).
You-Jen Chou, MD appears in the CMS NPPES registry as an Internal Medicine Physician provider holding MD credentials at 1011 BALDWIN PARK BLVD, Baldwin Park, CA, 91706, with a listed phone of (626) 851-1011. NPI 1104070887 was issued on 11/08/2008.
Medicare Part D records for calendar year 2023 show 804 prescription claims written by this provider, covering 259 Medicare beneficiaries and totaling roughly $204K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 100/100 for the 2023 performance year, compared with the national average of 83.1.
Internal Medicine Physician is a high-volume specialty nationwide, with 172,737 enrolled providers across 56 states and an average of 2,716 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 | 1104070887 |
|---|---|
| Specialty | Internal Medicine Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 11/08/2008 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
100
Final Score
Avg: 83.1
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where You-Jen Chou, 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.
United Medical Doctors
Irvine, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
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 You-Jen Chou, MD. Source: openpaymentsdata.cms.gov.
Total received
$1.0K
Largest payer
ABBVIE INC.
Most common payment type
Food and Beverage
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 - California MBC 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 ~150K California medical licensees in 2023 - they are NOT specific to You-Jen Chou, MD. To verify You-Jen Chou, MD's current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC 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 California 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.
804
Total Claims
$204K
Total Drug Cost
259
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 1,775
- Total Day Supply
- 49,056
- Generic Drug Cost
- $58K
- Antibiotic Claims
- 20
Patient Demographics
- Average Patient Age
- 72.2 years
- Avg HCC Risk Score
- 1.42
- Gender Split
- 64% female / 36% male
- Age Distribution
- <65: 16, 65-74: 151, 75-84: 81, 85+: 11
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What You-Jen Chou, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Omeprazole
Omeprazole
170 claims
- Pantoprazole Sodium
Pantoprazole Sodium
117 claims
- Esomeprazole Magne… 58
Esomeprazole Magnesium
58 claims
- Dexlansoprazole Dr 45
Dexlansoprazole Dr
45 claims
- Linzess 32
Linzess
32 claims
- Famotidine 29
Famotidine
29 claims
- Dicyclomine Hcl 24
Dicyclomine Hcl
24 claims
- Amitriptyline Hcl 23
Amitriptyline Hcl
23 claims
| Drug | Claims |
|---|---|
| Omeprazole | 170 |
| Pantoprazole Sodium | 117 |
| Esomeprazole Magnesium | 58 |
| Dexlansoprazole Dr Dexlansoprazole | 45 |
| Linzess Linaclotide | 32 |
| Famotidine | 29 |
| Dicyclomine Hcl | 24 |
| Amitriptyline Hcl | 23 |
| Lactulose | 21 |
| Mounjaro Tirzepatide | 19 |
* 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 You-Jen Chou, 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
You-Jen Chou, MD's 804 claims are below the specialty average of 2,716.
Nearby Internal Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chou.
Dr. Jacob Aaron
MD
San Francisco, CA
Dr. Alistair Aaronson
MD
Stanford, CA
Dr. Jose Abad.
MD
Sacramento, CA
Dr. Donna Abare
MD
Oakland, CA
Marce Abare
Scotts Valley, CA
Compare Internal Medicine 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 California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Internal 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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Frequently Asked Questions
What is You-Jen Chou, MD's specialty? ▼
You-Jen Chou, MD specializes in Internal Medicine Physician and practices in Baldwin Park, California. Credentials: MD.
How much does You-Jen Chou, MD prescribe under Medicare Part D? ▼
In 2023, You-Jen Chou, MD wrote 804 Medicare Part D claims totaling $204K in drug costs for 259 beneficiaries.
What is You-Jen Chou, MD's Medicare quality score? ▼
You-Jen Chou, MD has a CMS MIPS Final Score of 100/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is You-Jen Chou, MD located? ▼
You-Jen Chou, MD is located at 1011 BALDWIN PARK BLVD, Baldwin Park, CA, 91706. Phone: (626) 851-1011.
What is You-Jen Chou, MD's NPI number? ▼
You-Jen Chou, MD's National Provider Identifier (NPI) is 1104070887, issued on 11/08/2008.
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 You-Jen Chou, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, You-Jen Chou, MD's most frequently prescribed drugs include Omeprazole, Pantoprazole Sodium, Esomeprazole Magnesium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does You-Jen Chou, MD accept Medicare? ▼
You-Jen Chou, MD appears in CMS Medicare data with 804 Part D claims and 259 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify You-Jen Chou, MD's credentials? ▼
You-Jen Chou, MD's NPI is 1104070887 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
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.