NPI registry status
Active
2026 NPPES data Ophthalmology Physician NPI 1225039092 M.D.
Verify on CMS → Calvin Eng, M.D.
Ophthalmology Physician in Monterey Park, 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 22,082 in Ophthalmology 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
7K
Medicare Part D claims · 1K beneficiaries · Ophthalmology Physician avg: 1K
Generic prescribing
73%
generic claims · 27% brand-name · higher generic rates reduce patient out-of-pocket costs
Industry payments
$289.46
12 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
Calvin Eng, M.D. filed 6,726 Medicare Part D claims in 2023 as a Ophthalmology Physician in Monterey Park, California, prescribing 73% generic.
- 7K
- Part D claims, 2023
- 73%
- 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.
Calvin Eng, M.D.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2023, across all CMS prescribers nationally
6,726 Top 4% higher than 96% 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)
Calvin Eng, M.D. 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 Calvin Eng, M.D.?
Quality data not reportedPrimary specialty
Ophthalmology Physician
Medicare Part D claims
6,726 374% vs specialty avg
Specialty distribution in California
How Ophthalmology 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 Ophthalmology 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).
Calvin Eng, M.D. appears in the CMS NPPES registry as an Ophthalmology Physician provider holding M.D. credentials at 850 S ATLANTIC BLVD, Monterey Park, CA, 91754, with a listed phone of (626) 289-8260. NPI 1225039092 was issued on 08/03/2005.
Medicare Part D records for calendar year 2023 show 6,726 prescription claims written by this provider, covering 1,245 Medicare beneficiaries and totaling roughly $421K in drug spend, split 27% brand-name and 73% generic by claim count.
Ophthalmology Physician is a mid-sized specialty nationwide, with 22,082 enrolled providers across 56 states and an average of 1,420 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 | 1225039092 |
|---|---|
| Specialty | Ophthalmology Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 08/03/2005 |
Hospital and facility affiliations
Facilities where Calvin Eng, 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.
Eng Medical Associates
Monterey Park, 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 Calvin Eng, M.D.. Source: openpaymentsdata.cms.gov.
Total received
$289
Largest payer
Oyster Point Pharma, 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 Calvin Eng, M.D.. To verify Calvin Eng, 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 · Above average
Calvin Eng, M.D. - brand share 27.0%
Ophthalmology Physician average
27% brand-name claims vs 73% generic, on 6,726 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.
6,726
Total Claims
$421K
Total Drug Cost
1,245
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 8,475
- Total Day Supply
- 232,438
- Brand vs Generic
- 27% brand / 73% generic
- Brand Drug Cost
- $281K
- Generic Drug Cost
- $140K
Patient Demographics
- Average Patient Age
- 76.1 years
- Avg HCC Risk Score
- 1.36
- Gender Split
- 58% female / 42% male
- Age Distribution
- <65: 17, 65-74: 559, 75-84: 465, 85+: 204
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Calvin Eng, M.D. prescribes most
Top Medicare Part D drugs by claim count, 2023
- Azelastine Hcl
Azelastine Hcl
2,375 claims
- Latanoprost
Latanoprost
1,268 claims
- Ketorolac Trometha… 455
Ketorolac Tromethamine
455 claims
- Timolol Maleate 421
Timolol Maleate
421 claims
- Prednisolone Acetate 379
Prednisolone Acetate
379 claims
- Brimonidine Tartrate 295
Brimonidine Tartrate
295 claims
- Dorzolamide-Timolol 196
Dorzolamide-Timolol
196 claims
- Lumigan 160
Lumigan
160 claims
| Drug | Claims |
|---|---|
| Azelastine Hcl | 2,375 |
| Latanoprost | 1,268 |
| Ketorolac Tromethamine | 455 |
| Timolol Maleate | 421 |
| Prednisolone Acetate | 379 |
| Brimonidine Tartrate | 295 |
| Dorzolamide-Timolol Dorzolamide Hcl/Timolol Maleat | 196 |
| Lumigan Bimatoprost | 160 |
| Ciprofloxacin Hcl | 131 |
| Neomycin-Polymyxin-Dexameth Neomycin/Polymyxin B/Dexametha | 130 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
Ophthalmology Physician Overview
How Calvin Eng, M.D. fits within the Ophthalmology Physician landscape nationally.
22,082
Ophthalmology Physician Providers in US
56
States with Ophthalmology Physician
1,420
Avg Claims per Provider
Calvin Eng, M.D.'s 6,726 claims are above the specialty average of 1,420.
Nearby Ophthalmology Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Eng.
Dr. Sam Abbassi
MD, MS
West Hills, CA
Dr. Richard Abbott
M.D.
San Francisco, CA
Dr. Nizar Abdelfattah
MD
Pasadena, CA
Dr. Parastou Abedi
MD
Aliso Viejo, CA
Dr. Shahla Abedi
MD
Aliso Viejo, CA
Compare Ophthalmology 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 Ophthalmology 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 Calvin Eng, M.D.'s specialty? ▼
Calvin Eng, M.D. specializes in Ophthalmology Physician and practices in Monterey Park, California. Credentials: M.D..
How much does Calvin Eng, M.D. prescribe under Medicare Part D? ▼
In 2023, Calvin Eng, M.D. wrote 6,726 Medicare Part D claims totaling $421K in drug costs for 1,245 beneficiaries.
Where is Calvin Eng, M.D. located? ▼
Calvin Eng, M.D. is located at 850 S ATLANTIC BLVD, Monterey Park, CA, 91754. Phone: (626) 289-8260.
What is Calvin Eng, M.D.'s NPI number? ▼
Calvin Eng, M.D.'s National Provider Identifier (NPI) is 1225039092, issued on 08/03/2005.
Does Calvin Eng, M.D. prescribe more brand-name or generic drugs? ▼
Calvin Eng, M.D.'s prescribing is 27% brand-name and 73% generic drugs by claim count, with $281K in brand drug costs.
How many Ophthalmology Physician providers are there in the US? ▼
There are 22,082 Ophthalmology Physician providers across 56 states in the US. The average Ophthalmology Physician provider writes 1,420 Medicare Part D claims per year.
What drugs does Calvin Eng, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Calvin Eng, M.D.'s most frequently prescribed drugs include Azelastine Hcl, Latanoprost, Ketorolac Tromethamine. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Calvin Eng, M.D. accept Medicare? ▼
Calvin Eng, M.D. appears in CMS Medicare data with 6,726 Part D claims and 1,245 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Calvin Eng, M.D.'s credentials? ▼
Calvin Eng, M.D.'s NPI is 1225039092 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.
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.