NPI registry status
Active
2026 NPPES data Family Medicine Physician NPI 1376791152 M.D.
Verify on CMS → Alexander Oparin, M.D.
Family Medicine Physician in Oakland, 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 147,640 in Family 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
4K
Medicare Part D claims · 526 beneficiaries · Family Medicine Physician avg: 3K
Generic prescribing
93%
generic claims · 7% 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
Alexander Oparin, M.D. filed 4,092 Medicare Part D claims in 2023 as a Family Medicine Physician in Oakland, California, prescribing 93% generic.
- 4K
- Part D claims, 2023
- 93%
- generic prescribing
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.
Alexander Oparin, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
4,092 Top 8% higher than 92% 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-eligible specialty (heuristic, not verified)
Alexander Oparin, M.D. practices in an ABMS-board-eligible specialty but we don't have enough CMS-participation signals to confirm active board-certified status. Consult CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Alexander Oparin, M.D.?
Quality data not reportedPrimary specialty
Family Medicine Physician
Medicare Part D claims
4,092 20% vs specialty avg
Specialty distribution in California
How Family Medicine 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 Family Medicine 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).
Alexander Oparin, M.D. appears in the CMS NPPES registry as a Family Medicine Physician provider holding M.D. credentials at 275 W MACARTHUR BLVD, Oakland, CA, 94611, with a listed phone of (510) 752-1190. NPI 1376791152 was issued on 09/04/2008.
Medicare Part D records for calendar year 2023 show 4,092 prescription claims written by this provider, covering 526 Medicare beneficiaries and totaling roughly $173K in drug spend, split 7% brand-name and 93% generic by claim count, with an opioid prescribing rate of 5.2%.
Family Medicine Physician is a high-volume specialty nationwide, with 147,640 enrolled providers across 56 states and an average of 3,418 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 | 1376791152 |
|---|---|
| Specialty | Family Medicine Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 09/04/2008 |
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 Alexander Oparin, M.D.. To verify Alexander Oparin, 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 · Generic-heavy
Alexander Oparin, M.D. - brand share 7.0%
Family Medicine Physician average
7% brand-name claims vs 93% generic, on 4,092 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.
4,092
Total Claims
$173K
Total Drug Cost
526
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 9,450
- Total Day Supply
- 271,034
- Brand vs Generic
- 7% brand / 93% generic
- Brand Drug Cost
- $92K
- Generic Drug Cost
- $80K
- Opioid Claims
- 212 (5.2% rate)
- Antibiotic Claims
- 93
Patient Demographics
- Average Patient Age
- 74.7 years
- Avg HCC Risk Score
- 1.07
- Gender Split
- 45% female / 55% male
- Age Distribution
- <65: 17, 65-74: 249, 75-84: 204, 85+: 56
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Alexander Oparin, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Atorvastatin Calcium
Atorvastatin Calcium
395 claims
- Amlodipine Besylate
Amlodipine Besylate
180 claims
- Losartan Potassium
Losartan Potassium
159 claims
- Hydrochlorothiazide 139
Hydrochlorothiazide
139 claims
- Lisinopril 127
Lisinopril
127 claims
- Tamsulosin Hcl 107
Tamsulosin Hcl
107 claims
- Levothyroxine Sodium 95
Levothyroxine Sodium
95 claims
- Fluticasone Propio… 93
Fluticasone Propionate
93 claims
| Drug | Claims |
|---|---|
| Atorvastatin Calcium | 395 |
| Amlodipine Besylate | 180 |
| Losartan Potassium | 159 |
| Hydrochlorothiazide | 139 |
| Lisinopril | 127 |
| Tamsulosin Hcl | 107 |
| Levothyroxine Sodium | 95 |
| Fluticasone Propionate | 93 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 86 |
| Metformin Hcl Er Metformin Hcl | 81 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Family Medicine Physician Overview
How Alexander Oparin, M.D. fits within the Family Medicine Physician landscape nationally.
147,640
Family Medicine Physician Providers in US
56
States with Family Medicine Physician
3,418
Avg Claims per Provider
Alexander Oparin, M.D.'s 4,092 claims are above the specialty average of 3,418.
Nearby Family Medicine Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Oparin.
Dr. Omer Aba-Omer
MD
Santa Monica, CA
Dr. Michelle Ababa
MD
Wilmington, CA
Dr. Anna Tzeitel Abalos
MD
Roseville, CA
Dr. Adan Abarca
MD
Anaheim, CA
Dr. Lorraine Abate
M.D.
Sacramento, CA
Compare Family 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 Family 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.
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 Alexander Oparin, M.D.'s specialty? ▼
Alexander Oparin, M.D. specializes in Family Medicine Physician and practices in Oakland, California. Credentials: M.D..
How much does Alexander Oparin, M.D. prescribe under Medicare Part D? ▼
In 2023, Alexander Oparin, M.D. wrote 4,092 Medicare Part D claims totaling $173K in drug costs for 526 beneficiaries.
Where is Alexander Oparin, M.D. located? ▼
Alexander Oparin, M.D. is located at 275 W MACARTHUR BLVD, Oakland, CA, 94611. Phone: (510) 752-1190.
What is Alexander Oparin, M.D.'s NPI number? ▼
Alexander Oparin, M.D.'s National Provider Identifier (NPI) is 1376791152, issued on 09/04/2008.
Does Alexander Oparin, M.D. prescribe more brand-name or generic drugs? ▼
Alexander Oparin, M.D.'s prescribing is 7% brand-name and 93% generic drugs by claim count, with $92K in brand drug costs.
Does Alexander Oparin, M.D. prescribe opioids? ▼
Yes, Alexander Oparin, M.D. had 212 opioid claims in 2023 with an opioid prescribing rate of 5.2%.
How many Family Medicine Physician providers are there in the US? ▼
There are 147,640 Family Medicine Physician providers across 56 states in the US. The average Family Medicine Physician provider writes 3,418 Medicare Part D claims per year.
What drugs does Alexander Oparin, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Alexander Oparin, M.D.'s most frequently prescribed drugs include Atorvastatin Calcium, Amlodipine Besylate, Losartan Potassium. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Alexander Oparin, M.D. accept Medicare? ▼
Alexander Oparin, M.D. appears in CMS Medicare data with 4,092 Part D claims and 526 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Alexander Oparin, M.D.'s credentials? ▼
Alexander Oparin, M.D.'s NPI is 1376791152 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.
- 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.