NPI registry status
Active
2026 NPPES data Radiation Oncology Physician NPI 1639639503 MD, MS
Verify on CMS → Derek Go, MD, MS
Radiation 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 6,029 in Radiation 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
107
Medicare Part D claims · 52 beneficiaries · Radiation Oncology Physician avg: 186
Generic prescribing
86%
generic claims · 14% brand-name · higher generic rates reduce patient out-of-pocket costs
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
Derek Go, MD, MS filed 107 Medicare Part D claims in 2023 as a Radiation Oncology Physician in Los Angeles, California, prescribing 86% generic.
- 107
- Part D claims, 2023
- 86%
- 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.
Derek Go, MD, MS's Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
107 35th percentile higher than 35% of 1,370,886 prescribers
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.
Source CMS Medicare Part D Prescriber Public Use File · 2023
✓
Board certification likely (heuristic, not verified)
Derek Go, MD, MS practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + 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 Derek Go, MD, MS?
Quality data not reportedPrimary specialty
Radiation Oncology Physician
Medicare Part D claims
107 42% vs specialty avg
Specialty distribution in California
How Radiation Oncology Physician compares to other specialties among California 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 Radiation Oncology 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).
Derek Go, MD, MS appears in the CMS NPPES registry as a Radiation Oncology Physician provider holding MD, MS credentials at 9961 SIERRA AVENUE, Los Angeles, CA, 90074, with a listed phone of (833) 574-2273. NPI 1639639503 was issued on 03/25/2019.
Medicare Part D records for calendar year 2023 show 107 prescription claims written by this provider, covering 52 Medicare beneficiaries and totaling roughly $3K in drug spend, split 14% brand-name and 86% generic by claim count.
Radiation Oncology Physician is a mid-sized specialty nationwide, with 6,029 enrolled providers across 53 states and an average of 186 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 | 1639639503 |
|---|---|
| Specialty | Radiation Oncology Physician |
| Credentials | MD, MS |
| Gender | Male |
| NPI Issued | 03/25/2019 |
Hospital and facility affiliations
Facilities where Derek Go, MD, MS 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.
Southern California Permanente Medical Group
Ontario, 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).
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 Derek Go, MD, MS. To verify Derek Go, MD, MS'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
Derek Go, MD, MS - brand share 14.0%
Radiation Oncology Physician average
14% brand-name claims vs 86% generic, on 107 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.
107
Total Claims
$3K
Total Drug Cost
52
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 153
- Total Day Supply
- 3,370
- Brand vs Generic
- 14% brand / 86% generic
- Brand Drug Cost
- $285
- Generic Drug Cost
- $2K
Patient Demographics
- Average Patient Age
- 75.0 years
- Avg HCC Risk Score
- 1.86
- Gender Split
- 29% female / 71% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Lidocaine Hcl Viscous Lidocaine Hcl | 29 |
| Tamsulosin Hcl | 17 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Radiation Oncology Physician Overview
How Derek Go, MD, MS fits within the Radiation Oncology Physician landscape nationally.
6,029
Radiation Oncology Physician Providers in US
53
States with Radiation Oncology Physician
186
Avg Claims per Provider
Derek Go, MD, MS's 107 claims are below the specialty average of 186.
Nearby Radiation Oncology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Go.
Dr. Christina Abel
NURSE PRACTITIONER
Orange, CA
Dr. Roy Abendroth
MD
San Francisco, CA
Dr. Sunil Advani
M.D.
La Jolla, CA
Dr. Faisal Ahmed
MD
Stanford, CA
Dr. Eugene Ahn
MD
Simi Valley, CA
Compare Radiation 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 Radiation 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 Derek Go, MD, MS's specialty? ▼
Derek Go, MD, MS specializes in Radiation Oncology Physician and practices in Los Angeles, California. Credentials: MD, MS.
How much does Derek Go, MD, MS prescribe under Medicare Part D? ▼
In 2023, Derek Go, MD, MS wrote 107 Medicare Part D claims totaling $3K in drug costs for 52 beneficiaries.
Where is Derek Go, MD, MS located? ▼
Derek Go, MD, MS is located at 9961 SIERRA AVENUE, Los Angeles, CA, 90074. Phone: (833) 574-2273.
What is Derek Go, MD, MS's NPI number? ▼
Derek Go, MD, MS's National Provider Identifier (NPI) is 1639639503, issued on 03/25/2019.
Does Derek Go, MD, MS prescribe more brand-name or generic drugs? ▼
Derek Go, MD, MS's prescribing is 14% brand-name and 86% generic drugs by claim count, with $285 in brand drug costs.
How many Radiation Oncology Physician providers are there in the US? ▼
There are 6,029 Radiation Oncology Physician providers across 53 states in the US. The average Radiation Oncology Physician provider writes 186 Medicare Part D claims per year.
What drugs does Derek Go, MD, MS prescribe most often? ▼
Based on 2023 Medicare Part D data, Derek Go, MD, MS's most frequently prescribed drugs include Lidocaine Hcl Viscous, Tamsulosin Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Derek Go, MD, MS accept Medicare? ▼
Derek Go, MD, MS appears in CMS Medicare data with 107 Part D claims and 52 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Derek Go, MD, MS's credentials? ▼
Derek Go, MD, MS's NPI is 1639639503 with credentials MD, MS. 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
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.