NPI registry status
Active
2026 NPPES data Surgery Physician NPI 1023166071 MD
Verify on CMS → Gary Belzberg, MD
Surgery Physician in Harbor City, 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 36,199 in Surgery 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
130
Medicare Part D claims · 74 beneficiaries · Surgery Physician avg: 169
Generic prescribing
88%
generic claims · 12% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
81.4/100
▼ 2 pts below national avg 83.1 · Above neutral
Industry payments
$17.13
1 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
Gary Belzberg, MD reported a CMS MIPS final score of 81.4/100 - below the 83.1 national average - and filed 130 Medicare Part D claims in 2023.
- 81.4/100
- MIPS score · -2 vs avg
- 130
- Part D claims, 2023
- 88%
- 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.
Gary Belzberg, MD'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 Gary Belzberg, MD sits
This provider among surgery physician peers
Across the 7,525 surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gary Belzberg, MD writes more Part D claims than 62% of them and scores higher on MIPS quality than 35% - 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 surgery physician peer from a representative sample of 60; the gold marker is Gary Belzberg, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gary Belzberg, 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 Gary Belzberg, MD?
Near national averagePrimary specialty
Surgery Physician
Medicare Part D claims
130 23% vs specialty avg
MIPS final score
81.4/100 1.7 pts vs avg
Specialty distribution in California
How Surgery Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Gary Belzberg, MD's 2023 MIPS final score plotted against the Surgery Physician national average
- MIPS Final Score
- 81.4/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Surgery Physician) - 81.4/100 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).
Gary Belzberg, MD appears in the CMS NPPES registry as a Surgery Physician provider holding MD credentials at 25825 VERMONT AVE, Harbor City, CA, 90710, with a listed phone of (310) 325-5111. NPI 1023166071 was issued on 01/08/2007.
Medicare Part D records for calendar year 2023 show 130 prescription claims written by this provider, covering 74 Medicare beneficiaries and totaling roughly $1K in drug spend, split 12% brand-name and 88% generic by claim count, with an opioid prescribing rate of 45.4%. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 81.4/100 for the 2023 performance year (Quality 75.2, Cost 71.2), compared with the national average of 83.1.
Surgery Physician is a mid-sized specialty nationwide, with 36,199 enrolled providers across 56 states and an average of 169 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 | 1023166071 |
|---|---|
| Specialty | Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 01/08/2007 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
81.4191
Final Score
Avg: 83.1
75.1777
Quality
71.16
Cost
Reporting: Group practice
Hospital and facility affiliations
Facilities where Gary Belzberg, 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.
Onslow Ambulatory Services Inc
Jacksonville, NC
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 Gary Belzberg, MD. Source: openpaymentsdata.cms.gov.
Total received
$17
Largest payer
Intra-Sana Laboratories
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 Gary Belzberg, MD. To verify Gary Belzberg, 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.
Brand vs generic prescribing mix · Typical
Gary Belzberg, MD - brand share 12.0%
Surgery Physician average
12% brand-name claims vs 88% generic, on 130 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.
130
Total Claims
$1K
Total Drug Cost
74
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 142
- Total Day Supply
- 1,372
- Brand vs Generic
- 12% brand / 88% generic
- Brand Drug Cost
- $583
- Generic Drug Cost
- $851
- Opioid Claims
- 59 (45.4% rate)
- Antibiotic Claims
- 11
Patient Demographics
- Average Patient Age
- 69.7 years
- Avg HCC Risk Score
- 1.37
- Gender Split
- 61% female / 39% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Gary Belzberg, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Hydrocodone-Acetam…
Hydrocodone-Acetaminophen
25 claims
- Oxycodone-Acetamin…
Oxycodone-Acetaminophen
20 claims
- Tramadol Hcl
Tramadol Hcl
14 claims
| Drug | Claims |
|---|---|
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 25 |
| Oxycodone-Acetaminophen Oxycodone Hcl/Acetaminophen | 20 |
| Tramadol Hcl | 14 |
| Gavilyte-G "Peg3350/Sod Sulf | N/A |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Surgery Physician Overview
How Gary Belzberg, MD fits within the Surgery Physician landscape nationally.
36,199
Surgery Physician Providers in US
56
States with Surgery Physician
169
Avg Claims per Provider
Gary Belzberg, MD's 130 claims are below the specialty average of 169.
Nearby Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Belzberg.
Dr. Oliver Aalami
M.D.
Stanford, CA
Dr. Shahram Aarabi
MD
Oakland, CA
Dr. Miriam Abaunza
M.D.
Los Angeles, CA
Dr. Benjamin Abbadessa
M.D.
San Diego, CA
Abdul-Rahman Abdel-Reheem
Los Angeles, CA
Compare Surgery 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 Surgery 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 Gary Belzberg, MD's specialty? ▼
Gary Belzberg, MD specializes in Surgery Physician and practices in Harbor City, California. Credentials: MD.
How much does Gary Belzberg, MD prescribe under Medicare Part D? ▼
In 2023, Gary Belzberg, MD wrote 130 Medicare Part D claims totaling $1K in drug costs for 74 beneficiaries.
What is Gary Belzberg, MD's Medicare quality score? ▼
Gary Belzberg, MD has a CMS MIPS Final Score of 81.4/100 (Quality: 75.2, Cost: 71.2). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Gary Belzberg, MD located? ▼
Gary Belzberg, MD is located at 25825 VERMONT AVE, Harbor City, CA, 90710. Phone: (310) 325-5111.
What is Gary Belzberg, MD's NPI number? ▼
Gary Belzberg, MD's National Provider Identifier (NPI) is 1023166071, issued on 01/08/2007.
Does Gary Belzberg, MD prescribe more brand-name or generic drugs? ▼
Gary Belzberg, MD's prescribing is 12% brand-name and 88% generic drugs by claim count, with $583 in brand drug costs.
Does Gary Belzberg, MD prescribe opioids? ▼
Yes, Gary Belzberg, MD had 59 opioid claims in 2023 with an opioid prescribing rate of 45.4%.
How many Surgery Physician providers are there in the US? ▼
There are 36,199 Surgery Physician providers across 56 states in the US. The average Surgery Physician provider writes 169 Medicare Part D claims per year.
What drugs does Gary Belzberg, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Gary Belzberg, MD's most frequently prescribed drugs include Hydrocodone-Acetaminophen, Oxycodone-Acetaminophen, Tramadol Hcl. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gary Belzberg, MD accept Medicare? ▼
Gary Belzberg, MD appears in CMS Medicare data with 130 Part D claims and 74 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gary Belzberg, MD's credentials? ▼
Gary Belzberg, MD's NPI is 1023166071 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.