NPI registry status
Active
2026 NPPES data Surgical Oncology Physician NPI 1356578066 MD, PHD
Verify on CMS → Arnold Chin, MD, PHD
Surgical Oncology Physician in Los Angeles, 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 1,410 in Surgical 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
438
Medicare Part D claims · 169 beneficiaries · Surgical Oncology Physician avg: 97
Generic prescribing
91%
generic claims · 9% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
81.1/100
▼ 2 pts below national avg 83.1 · Above neutral
Industry payments
$13.0K
22 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
Arnold Chin, MD, PHD reported a CMS MIPS final score of 81.1/100 - below the 83.1 national average - and filed 438 Medicare Part D claims in 2023.
- 81.1/100
- MIPS score · -2 vs avg
- 438
- Part D claims, 2023
- 91%
- 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.
Arnold Chin, MD, PHD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
81 36th percentile higher than 36% 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 Arnold Chin, MD, PHD sits
This provider among surgical oncology physician peers
Across the 416 surgical oncology physician providers who report both Medicare Part D prescribing and a MIPS quality score, Arnold Chin, MD, PHD writes more Part D claims than 96% of them and scores higher on MIPS quality than 29% - placing this provider in the high-volume, lower-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 surgical oncology physician peer from a representative sample of 60; the gold marker is Arnold Chin, MD, PHD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Arnold Chin, MD, PHD 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 Arnold Chin, MD, PHD?
Near national averagePrimary specialty
Surgical Oncology Physician
Medicare Part D claims
438 352% vs specialty avg
MIPS final score
81.1/100 2 pts vs avg
Specialty distribution in California
How Surgical Oncology Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Arnold Chin, MD, PHD's 2023 MIPS final score plotted against the Surgical Oncology Physician national average
- MIPS Final Score
- 81.1/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Surgical Oncology Physician) - 81.1/100 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).
Arnold Chin, MD, PHD appears in the CMS NPPES registry as a Surgical Oncology Physician provider holding MD, PHD credentials at 200 UCLA MEDICAL PLZ, Los Angeles, CA, 90095, with a listed phone of (310) 206-5343. NPI 1356578066 was issued on 06/19/2009.
Medicare Part D records for calendar year 2023 show 438 prescription claims written by this provider, covering 169 Medicare beneficiaries and totaling roughly $31K in drug spend, split 9% brand-name and 91% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 81.1/100 for the 2023 performance year (Quality 70.9, Cost 57.6), compared with the national average of 83.1.
Surgical Oncology Physician is a narrow specialty nationwide, with 1,410 enrolled providers across 50 states and an average of 97 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 | 1356578066 |
|---|---|
| Specialty | Surgical Oncology Physician |
| Credentials | MD, PHD |
| Gender | Male |
| NPI Issued | 06/19/2009 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
81.1405
Final Score
Avg: 83.1
70.9497
Quality
57.6443
Cost
100
Promoting Interoperability
Reporting: Group practice
Hospital and facility affiliations
Facilities where Arnold Chin, MD, PHD 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.
The Regents OF The University OF California
Santa Monica, 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 Arnold Chin, MD, PHD. Source: openpaymentsdata.cms.gov.
Total received
$13.0K
Largest payer
INTUITIVE SURGICAL, INC.
Most common payment type
Travel and Lodging
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 Arnold Chin, MD, PHD. To verify Arnold Chin, MD, PHD'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 · Generic-heavy
Arnold Chin, MD, PHD - brand share 9.0%
Surgical Oncology Physician average
9% brand-name claims vs 91% generic, on 438 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.
438
Total Claims
$31K
Total Drug Cost
169
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 896
- Total Day Supply
- 24,375
- Brand vs Generic
- 9% brand / 91% generic
- Brand Drug Cost
- $17K
- Generic Drug Cost
- $13K
- Antibiotic Claims
- 107
Patient Demographics
- Average Patient Age
- 75.4 years
- Avg HCC Risk Score
- 1.71
- Gender Split
- 9% female / 91% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Arnold Chin, MD, PHD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Tamsulosin Hcl
Tamsulosin Hcl
154 claims
- Finasteride 49
Finasteride
49 claims
- Ciprofloxacin Hcl 35
Ciprofloxacin Hcl
35 claims
- Sulfamethoxazole-T… 28
Sulfamethoxazole-Trimethoprim
28 claims
- Myrbetriq 26
Myrbetriq
26 claims
- Alfuzosin Hcl Er 16
Alfuzosin Hcl Er
16 claims
- Cephalexin 11
Cephalexin
11 claims
| Drug | Claims |
|---|---|
| Tamsulosin Hcl | 154 |
| Finasteride | 49 |
| Ciprofloxacin Hcl | 35 |
| Sulfamethoxazole-Trimethoprim Sulfamethoxazole/Trimethoprim | 28 |
| Myrbetriq Mirabegron | 26 |
| Alfuzosin Hcl Er Alfuzosin Hcl | 16 |
| Cephalexin | 11 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgical Oncology Physician Overview
How Arnold Chin, MD, PHD fits within the Surgical Oncology Physician landscape nationally.
1,410
Surgical Oncology Physician Providers in US
50
States with Surgical Oncology Physician
97
Avg Claims per Provider
Arnold Chin, MD, PHD's 438 claims are above the specialty average of 97.
Nearby Surgical Oncology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chin.
Dr. Rahim Aimaq
MD
Duarte, CA
Yasir Akmal
Los Angeles, CA
Dr. Mohammed Al-Temimi
MD
San Jose, CA
Dr. Farin Amersi
M.D.
West Hollywood, CA
Dr. Elizabeth Arena
M.D.
Los Angeles, CA
Compare Surgical 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 Surgical 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.
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Frequently Asked Questions
What is Arnold Chin, MD, PHD's specialty? ▼
Arnold Chin, MD, PHD specializes in Surgical Oncology Physician and practices in Los Angeles, California. Credentials: MD, PHD.
How much does Arnold Chin, MD, PHD prescribe under Medicare Part D? ▼
In 2023, Arnold Chin, MD, PHD wrote 438 Medicare Part D claims totaling $31K in drug costs for 169 beneficiaries.
What is Arnold Chin, MD, PHD's Medicare quality score? ▼
Arnold Chin, MD, PHD has a CMS MIPS Final Score of 81.1/100 (Quality: 70.9, Cost: 57.6). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Arnold Chin, MD, PHD located? ▼
Arnold Chin, MD, PHD is located at 200 UCLA MEDICAL PLZ, Los Angeles, CA, 90095. Phone: (310) 206-5343.
What is Arnold Chin, MD, PHD's NPI number? ▼
Arnold Chin, MD, PHD's National Provider Identifier (NPI) is 1356578066, issued on 06/19/2009.
Does Arnold Chin, MD, PHD prescribe more brand-name or generic drugs? ▼
Arnold Chin, MD, PHD's prescribing is 9% brand-name and 91% generic drugs by claim count, with $17K in brand drug costs.
How many Surgical Oncology Physician providers are there in the US? ▼
There are 1,410 Surgical Oncology Physician providers across 50 states in the US. The average Surgical Oncology Physician provider writes 97 Medicare Part D claims per year.
What drugs does Arnold Chin, MD, PHD prescribe most often? ▼
Based on 2023 Medicare Part D data, Arnold Chin, MD, PHD's most frequently prescribed drugs include Tamsulosin Hcl, Finasteride, Ciprofloxacin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Arnold Chin, MD, PHD accept Medicare? ▼
Arnold Chin, MD, PHD appears in CMS Medicare data with 438 Part D claims and 169 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Arnold Chin, MD, PHD's credentials? ▼
Arnold Chin, MD, PHD's NPI is 1356578066 with credentials MD, PHD. 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.