NPI registry status
Active
2026 NPPES data Gynecologic Oncology Physician NPI 1346441144 M.D.
Verify on CMS → Christopher Chung, M.D.
Gynecologic Oncology Physician in Arcadia, 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 1,364 in Gynecologic Oncology 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
678
Medicare Part D claims · 214 beneficiaries · Gynecologic Oncology Physician avg: 188
Generic prescribing
80%
generic claims · 20% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
99.1/100
▲ 16 pts above national avg 83.1 · Exceptional
Industry payments
$433.23
8 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Christopher Chung, M.D. reported a CMS MIPS final score of 99.1/100 - above the 83.1 national average - and filed 678 Medicare Part D claims in 2023.
- 99.1/100
- MIPS score · +16 vs avg
- 678
- 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.
Christopher Chung, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
99 Top 9% higher than 91% 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 Christopher Chung, M.D. sits
This provider among gynecologic oncology physician peers
Across the 446 gynecologic oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Christopher Chung, M.D. writes more Part D claims than 93% of them and scores higher on MIPS quality than 89% - 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 gynecologic oncology physician peer from a representative sample of 60; the gold marker is Christopher Chung, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Christopher Chung, M.D. 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 Christopher Chung, M.D.?
High performer (top quartile)Primary specialty
Gynecologic Oncology Physician
Medicare Part D claims
678 261% vs specialty avg
MIPS final score
99.1/100 16 pts vs avg
Specialty distribution in California
How Gynecologic Oncology Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Christopher Chung, M.D.'s 2023 MIPS final score plotted against the Gynecologic Oncology Physician national average
- MIPS Final Score
- 99.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Gynecologic Oncology Physician) - 99.1/100 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).
Christopher Chung, M.D. appears in the CMS NPPES registry as a Gynecologic Oncology Physician provider holding M.D. credentials at 301 W HUNTINGTON DR STE 400, Arcadia, CA, 91007, with a listed phone of (626) 218-9840. NPI 1346441144 was issued on 05/30/2007.
Medicare Part D records for calendar year 2023 show 678 prescription claims written by this provider, covering 214 Medicare beneficiaries and totaling roughly $58K in drug spend, split 20% brand-name and 80% generic by claim count, with an opioid prescribing rate of 8.8%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 99.1/100 for the 2023 performance year (Quality 85.2), compared with the national average of 83.1.
Gynecologic Oncology Physician is a narrow specialty nationwide, with 1,364 enrolled providers across 49 states and an average of 188 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 | 1346441144 |
|---|---|
| Specialty | Gynecologic Oncology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 05/30/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
99.1275
Final Score
Avg: 83.1
85.2396
Quality
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Christopher Chung, 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.
City OF Hope Medical Foundation
Duarte, 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 Christopher Chung, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$433
Largest payer
Caldera Medical, 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 Christopher Chung, M.D.. To verify Christopher Chung, M.D.'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.
Brand vs generic prescribing mix · Typical
Christopher Chung, M.D. - brand share 20.0%
Gynecologic Oncology Physician average
20% brand-name claims vs 80% generic, on 678 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.
678
Total Claims
$58K
Total Drug Cost
214
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 954
- Total Day Supply
- 21,545
- Brand vs Generic
- 20% brand / 80% generic
- Brand Drug Cost
- $34K
- Generic Drug Cost
- $24K
- Opioid Claims
- 60 (8.8% rate)
- Antibiotic Claims
- 186
Patient Demographics
- Average Patient Age
- 73.2 years
- Avg HCC Risk Score
- 1.94
- Age Distribution
- <65: 21, 65-74: 97, 75-84: 73, 85+: 23
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Christopher Chung, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Nitrofurantoin Mon…
Nitrofurantoin Mono-Macro
156 claims
- Estradiol
Estradiol
139 claims
- Oxybutynin Chloride
Oxybutynin Chloride
111 claims
- Ibuprofen
Ibuprofen
75 claims
- Oxycodone-Acetamin… 56
Oxycodone-Acetaminophen
56 claims
- Myrbetriq 30
Myrbetriq
30 claims
- Loperamide 15
Loperamide
15 claims
| Drug | Claims |
|---|---|
| Nitrofurantoin Mono-Macro Nitrofurantoin Monohyd/M-Cryst | 156 |
| Estradiol | 139 |
| Oxybutynin Chloride | 111 |
| Ibuprofen | 75 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 56 |
| Myrbetriq Mirabegron | 30 |
| Loperamide Loperamide Hcl | 15 |
| Premarin "Estrogens | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Gynecologic Oncology Physician Overview
How Christopher Chung, M.D. fits within the Gynecologic Oncology Physician landscape nationally.
1,364
Gynecologic Oncology Physician Providers in US
49
States with Gynecologic Oncology Physician
188
Avg Claims per Provider
Christopher Chung, M.D.'s 678 claims are above the specialty average of 188.
Nearby Gynecologic Oncology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chung.
Dr. Lisa Abaid
M.D., M.P.H.
Newport Beach, CA
Dr. Alireza Abidi
M.D.
Sacramento, CA
Dr. Federico Alva
M.D.
Northridge, CA
Dr. Edwin Alvarez
M.D.
Sacramento, CA
Dr. Kristen Anderson
M.D., PH.D.
Moreno Valley, CA
Compare Gynecologic Oncology 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 Gynecologic Oncology 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.
Healthcare Guides
Learn more about finding, verifying, and understanding healthcare providers.
How to Find a Doctor
Step-by-step guide to choosing a provider
Verify Credentials
Check NPI, board certification & license status
Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
What prescribing data reveals about a provider
In-Network vs Out-of-Network
How insurance networks affect your costs
Telehealth Guide
Virtual care options and coverage in 2026
Explore California
Frequently Asked Questions
What is Christopher Chung, M.D.'s specialty? ▼
Christopher Chung, M.D. specializes in Gynecologic Oncology Physician and practices in Arcadia, California. Credentials: M.D..
How much does Christopher Chung, M.D. prescribe under Medicare Part D? ▼
In 2023, Christopher Chung, M.D. wrote 678 Medicare Part D claims totaling $58K in drug costs for 214 beneficiaries.
What is Christopher Chung, M.D.'s Medicare quality score? ▼
Christopher Chung, M.D. has a CMS MIPS Final Score of 99.1/100 (Quality: 85.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Christopher Chung, M.D. located? ▼
Christopher Chung, M.D. is located at 301 W HUNTINGTON DR STE 400, Arcadia, CA, 91007. Phone: (626) 218-9840.
What is Christopher Chung, M.D.'s NPI number? ▼
Christopher Chung, M.D.'s National Provider Identifier (NPI) is 1346441144, issued on 05/30/2007.
Does Christopher Chung, M.D. prescribe more brand-name or generic drugs? ▼
Christopher Chung, M.D.'s prescribing is 20% brand-name and 80% generic drugs by claim count, with $34K in brand drug costs.
Does Christopher Chung, M.D. prescribe opioids? ▼
Yes, Christopher Chung, M.D. had 60 opioid claims in 2023 with an opioid prescribing rate of 8.8%.
How many Gynecologic Oncology Physician providers are there in the US? ▼
There are 1,364 Gynecologic Oncology Physician providers across 49 states in the US. The average Gynecologic Oncology Physician provider writes 188 Medicare Part D claims per year.
What drugs does Christopher Chung, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Christopher Chung, M.D.'s most frequently prescribed drugs include Nitrofurantoin Mono-Macro, Estradiol, Oxybutynin Chloride. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Christopher Chung, M.D. accept Medicare? ▼
Christopher Chung, M.D. appears in CMS Medicare data with 678 Part D claims and 214 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Christopher Chung, M.D.'s credentials? ▼
Christopher Chung, M.D.'s NPI is 1346441144 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 (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.